yashsingh1/xdaforums huggingface dataset:
[Nexus 7 General] ExploreMN:
I'm sure there are tablets with good storage chips. Heck, when I was at Staples doing the return I played around with their demo unit (which had screen lift on the left side LOL) and ran Androbench on it. The write speed was about double what I was getting new out of the box and freshly factory reset. However, much like I've chastised others on here for, I'm not about to get into the return loop people seem to get stuck on. I give companies 1-2 chances tops. Had Asus not been stupid about it, I might have risked a 2nd N7, but no fricken way would I have exchanged it 5, 7, 10 times like others seem to do.

In this case, I had a chance to get out of the loop with a full 100% refund so I took it (well, store credit 100% value) and just need to decide what I want instead. Looking at either the Galaxy Note 10.1 even though I prefer the 7" form factor, or possibly the Kindle Fire 8.9" model when it comes out.

I still think the N7 is an amazing tablet...assuming you don't get any of the quirky problems. Mine was 100% functional (even with the 5-7mb write speeds...store model got 10-12mb write speeds) but going down to 0.4mb write speeds because I use 11gb of my 13.25gb available space on my 16gb unit is completely unacceptable to me. :( Maybe the Nexus 7 C10Ok version would be better.
[Nexus 7 General] IntegraR:
By the way, I get the lag problem when the free space is 11GB... so in my opinion occupied storage may not be the root cause for the problem.
[Nexus 7 General] Metallice:
I'd just like to add my voice as well. There seems to be a 2GB free barrier for me where lag begins. Fsync off fixes the problem for me, but I know that's not a real solution.
[Nexus 7 General] duyquang27:
How to fsync off?
[Nexus 7 General] TheFury27:
A thought,

Do you guys use a firewall on your wifi? I observed that the lag occur when the sync is on and when I'm at school, I have mostly no lag. At home, I changed my wifi's firewall setting and the lag went away like when I disabled the sync.

I tried some kernel too, maybe it's come from that too.

Nexus 7 16gb

3gb left

Linaro kernel

Oc@1.5ghz
[Nexus 7 General] Jay Aristide:
Options as I see it:

* (recommended) take Google up on their offer, and at the same time help them fix the problem once and for all

* buy something else

* buy another n7 and purchase the throw-it-against-a-wall accidental/incidental protection plan that Staples offers, and if you have a problem and get treated the same way by Asus again, do just that: throw it against a wall and have it replaced :D
[Nexus 7 General] Metallice:
Motley or Trinity kernels let you turn fsync off through a terminal command, init.d, or using the Trinity app or some other app.
[Nexus 7 General] fire-star:
OMG

OMG ppl. Who can explain to me, why does Android lag in standard music player, EVEN ON NEXUS 7. I had it on a cheap samsung galaxy ace, so i had to install another player, but its OK, cheap phone u know... But now, same **** on android 4.1.1 . Cant believe that, cause i hate to install other app for music. CAN someone email Google and tell them to release an update?!

Everyone talks about sound quality, and that its crap in standard music player, but no one mentioned little laggs(they are like once in 30seconds, little but very annoying to me). Am i the only one to hear it? I cant listen music like that
[Nexus 7 General] androidkid311:
If it was as simple as emailing Google and saying update this now and it would be done...this thread wouldn't even be open lol. You can email Google directly and tell them about the problem like others(recommended). You could always try a different kernel and see how that works for you.
[Nexus 7 General] wasnt:
I had the lag issue and I can confirm that the fix for me was removing some stuff stored. I have 1.27GB remaining and the lag was intense. I now have 4.5GB free and everything is back to normal. This is only preliminary, I'm going to mess with it for a few days to make sure that fixed the issue.

=============================================

BEFORE - 1.27GB remaining

=============================================

SQLite Benchmark

Insert: 6.08 TPS

Update: 8.26 TPS

Delete: 6.41 TPS

MICRO

SEQ RD: 37.91 MB/s

SEQ WR: .56 MB/s

RND RD: 1902.13 IOPS(4K)

RND WR: 17.71 IPOS(4K)

=============================================

=============================================

AFTER - 4.5GB remaining

=============================================

SQLite Benchmark

Insert: 22.95 TPS

Update: 46.04 TPS

Delete: 25.17 TPS

MICRO

SEQ RD: 27.42 MB/s

SEQ WR: 3.5 MB/s

RND RD: 1693.71 IOPS(4K)

RND WR: 33.86 IPOS(4K)

=============================================

Not the happiest results considering I bought the 16GB so I could actually use that 16GB.
[Nexus 7 General] dwang:
With fysnc disable, I'm getting really good io numbers.
[Nexus 7 General] docangle:
Same here, the difference is night and day! I no longer have any lag, especially if I haven't used the N7 for a couple of hours and turn it on.
[Nexus 7 General] Metallice:
Unfortunately those results still aren't as good as before the issue arises. Wiping clean with fastboot images I get around 11 MB/s sequential write. When the issue starts at like 2 GB free it drops down to like 1 MB/s. Going deleting stuff to the amount free before it dropped from 11 doesn't bring it back to 11, only to around 2 and then 3 and maybe up to 4 with a whole lot of free space like you are seeing. I don't get 11 until I reformat data and start over. Its very frustrating.

---------- Post added at 01:37 AM ---------- Previous post was at 01:32 AM ----------

Those are really "fake" numbers. As I understand it Fsync off basically lets the system physically commit the data to disk whenever it wants instead of forcing it every so often. Androbench thinks it's writing quickly but the data is really just sitting in the buffer waiting to be written.
[Nexus 7 General] dwang:
I get about 8mb write speed with fsync enabled. I have about 4gb free space on my 16gb n7.
[Nexus 7 General] smacman:
I've been having this issue on my 16 GB N7 as well. For me it seems to start when the free storage falls below 2-3 GB. I did notice something interesting however which hasn't been mentioned in this thread yet. When the device gets laggy, if I turn wifi off, it seems fast again. As soon as I reenable wifi however, the lag is back. Can anyone else with lag confirm? If this wifi effect is reproducible, it may help Google get to the bottom of this issue.
[Nexus 7 General] khaytsus:
I have a few questions that hopefully can help figure out some things... First off, can someone define exactly what kind of reset is required? Do you have to format the internal storage, or is it a factory reset sufficient to restore to out-of-box speeds?

Second, anyone know much about Linux IO that can dive into the vmstat and dump_block to analyze exactly how much IO is going in/out and if there's excessive IO.

Even while the device is "idle", the Wait IO is very high sometimes, when the device is first woken up (not from off, just normal suspend) it's 99 for long periods of time. I suspect stuff is syncing, Google, etc. After that it's often 0's but then long strings of 50-60's so either something is hitting it hard, or it doesn't take much to hit it hard.

r b free mapped anon slab in cs flt us ni sy id wa ir
0 0 99068 69388 355048 59376 462 773 0 10 0 5 99 0 0

This is idle, so 0 wait which is good (there's not IO lag all the time anyway) but interrupts and context switches seem rather high, always 500+ and 700+ respectively, for an 'idle' device. Of course there's no such thing as truly idle on the device, and I have quite a few services, a few widgets, etc.

I've also noticed what seems to be very slow read speeds, almost every app makes the Wait IO jump to 99 for fairly long periods of time.

It'd be nice to know exactly what's going on in the background to know if it's excessive or it's purely a raw IO slowness.
[Nexus 7 General] ExploreMN:
Well, I kind of went with option B there. I took the full refund. This seemed more reasonable to me than spending $15+ to ship it to Asus (you know...gotta at least go with delivery confirmation and possibly insurance) only to have them give me a "no trouble found" speech on top of being without a needed device for lord knows how many weeks. They would not cross ship. Believe it or not, I use a tablet daily in my line(s) of work.

A friend of mine sold me his...somewhat outdated...Galaxy Tab 8.9 32gb for $200 and I'll probably use that for 4-6 months and then look at how the N7 builds are doing. I figure I could easily recover my money on the GT8.9 since it's not a bad unit by any means. I still have my accessories for the N7 and plan to come back in the future.

If the *throw it against the wall* option is still there and is reasonably priced, I might get that next time around. I'm still going to keep an eye on these forums as well. If Asus/Google fix this and it's software related, that will be good enough for me.
[Nexus 7 General] sym_richard:
Front my previous experience, fill storage is one of the essential tests, unless Google cannot match basic industry test standard...
[Nexus 7 General] fire-star:
i think i care too much about music, thats why i notice small lags. I should realy use anything but the android for that.

If google makes a music app, it has to be at least lagfree. otherwise its useless. Thats my opinion
[Nexus 7 General] Nexus_Lion:
The only time I have noticed any kind of lag is after booting and it's doing it's update of apps, during this time it's not really usable.
[Nexus 7 General] ncvikingx97:
Stock ROM

No root

8 gig

3 appsninstalled right now.

Just did a factory restore, but the thing still lags in the drawer . That is where most of the lag is. Any ideas?
[Nexus 7 General] slixzen:
khaytus,

Here is my vmstat while, idle, running Androbench, idle, then with the screen off. This is with ~500 MB left on the tablet.
[Nexus 7 General] khaytsus:
Same things I'm seeing, no CPU activity to speak of (US/SYS/NI etc) but WA (Wait IO) is very high, often 99%. Purely IO bound, but I'm not sure how to figure out what's causing it... It's either some constant IO or VERY slow IO, I think it's the latter.

What I don't understand is why it just crops up.. like for me, it was like flipping a switch. It went from fast to just dog slow and it was like that until I cleaned up about 3gb of space, and now it's just slow, somewhat better when I wake it up and leave it alone for a minute.. Meh.
[Nexus 7 General] burnduck:
Reset Factory Settings seems adequate, but the slow issue will come back as soon as the storage space gets filled.

I have also tried to re-flash with stock image which didn't make a difference.
[Nexus 7 General] angellsl:
Mine is lagging when it's filled. Had to remove a apps

Seems not helping.
[Nexus 7 General] Byrd910:
Flashing New ROM Fixed It

I was originally planning on keeping my N7 stock rooted, as I needed this device to remain more stable than my phone (I'm flashing new ROMs all the time on that :P). However, when I started experiencing large amounts of lag when opening apps or switching between apps, I bit the bullet, flashed TWRP, flashed the newest version of Bugless Beast, flashed the newest 484 GPU OC version of _motley's kernel, and set up zRAM (I also lowered voltages by -125mv across the board).

Oh my, not only did it fix the lag I was experiencing on the stock ROM, but this thing FLIES now, it's much faster than the stock ROM ever was. It zooms inbetween apps (multitasking is huge for me, as I use this as a laptop computer for taking notes and such in class) and it doesn't stutter anymore. So, my suggestion for anyone experiencing lag would be to flash a custom ROM, or a different custom ROM and see if that fixes it. If you wanted to remain stock like I did, Bugless Beast is a good choice, and you don't have to bother with flashing a different kernel unless you want to.

Also, I only have 2.72GB free. That may have been what caused the issue on the stock ROM, I don't know. Regardless, issue is fixed now.
[Nexus 7 General] angellsl:
Just cleared the cache for chrome,seems better now. It had over 200mb of cache!

Random write will suffer if ssd is filled. I would keep free space at least 15%. And also check the cache size of your favorite apps. If it's too big when a little space is left, that is not a good sign.

I think project butter in jb is all based on caching, if caching is handled poorly, you know the outcomes
[Nexus 7 General] jedi5diah:
For those who check the install from unknown sources, using apk. Please be warn that it has chances of having a BAD install, causing ridiculous lag on the whole system. i had to rectify by reset.

so do pay attention when you install apk away from play market. (esp from those beta apps)
[Nexus 7 General] yalouf:
Has it dropped below 11gb. Because sometimes it goes below and then you free up space but the harm has been already done...

Envoyé depuis mon Nexus 7 avec Tapatalk
[Nexus 7 General] mmaestro:
This is my sense, too. I think there's something going on where JB is reporting space that's being used for application cache as space that can be written to immediately. If you go into settings>apps, in my case the initial reported number for space used is high, and then you can watch it drop down to an "accurate" number. It turned out for me the discrepancy was application cache. Chrome was using a lot of space, over 300mb, but the real culprit for me was Google Music. I use Google Music a lot, and the cache was 2.3GB! I'd started seeing some slowdown over the weekend, and wiped out the cache for GM and Chrome, and my tablet is back to its normal speed. I don't know how long that'll likely last: clearly the threshold for lag varies between tablets, but after this my gut is the problem is something to do with reporting space used for cache files as free space.
[Nexus 7 General] slixzen:
I am assuming no one has heard a word from Paul (on the google product forums) about anything new yet, have they?
[Nexus 7 General] mmaestro:
He literally just replied saying that they had enough volunteers now.
[Nexus 7 General] slixzen:
Lol, I saw that right after I posted. The e-mail notification got burried. :D
[Nexus 7 General] Jay Aristide:
you guys with the large caches, consider using system tuner to clear your cache at boot-time. It'll make your device hang for a few seconds at boot-up, but should keep your cache under control :)
[Nexus 7 General] ncvikingx97:
Is anybody with a 8 gig nexus having issues? I am but I feel like I might be the only one , from what I have gathered. I read on android police, or android central, that it is an issue with the memory in the 16 gig.
[Nexus 7 General] dtblair24:
I too experienced some lag. My GS3 performs better it seems like. Definitely pinning it on an app or something though. Going to do a factory reset when I get home from work to see how things work out
[Nexus 7 General] jrpbulk:
When ICS dropped on my Droid RAZR I felt lag. Then I turned off all the transition animation features. That helped a lot. Try it, go to developer options I believe jellybean has 3 unique animations you can change one is called window animation scale, I turned mine to off.
[Nexus 7 General] androidkid311:
But that defeats the whole appealing look... animations are basic and this is quad core.... :-/
[Nexus 7 General] Shano56:
Try a factory reset. If not, get an RMA replacement
[Nexus 7 General] lovenokia:
I just might too, how can you tell them that your unit is defective, and how did you do it?
[Nexus 7 General] androidkid311:
I got mine from ebuyer.... did you? If so then then can tell you what I did :)
[Nexus 7 General] hawkye:
My Transformer Prime experiences some lag but that is a whole other topic. My Nexus 7 has been rock solid. I haven't noticed any lag. I have it loaded with apps. Mine has been updated to 4.1.1 and rooted. I think if you have a ton of lag on a factory reset of 4.1.1 then you have a defective unit.
[Nexus 7 General] burnduck:
Just ran the Androbench on two N7s, one of them lags almost system wide, and one thing I've noticed is the difference in the

storage write speed

.

Laggy N7 on the left, lightning fast N7 on the right.

The test itself took more than 3 times longer to complete on my slow N7. WiFi was turned off during test, rebooting device makes no difference.

http://www.anandtech.com/show/6130/the-16gb-nexus-7-storage-performance
[Nexus 7 General] gadgetpup:
I think the Google magazines app has a role to play in the lag. I've been able to stop the lag on my device by going into the apps manager and stopping the magazine app, the lag came back since I had the media widget showing my magazine covers on the home screen. Once I removed the widget and stopped the magazine app processes, I've remained lag free.
[Nexus 7 General] noxas:
Just ordered one from Ebuyer so I would like to know how you went about sending it back for a replacement (preparing for the worst so i wont be disapointed lol)
[Nexus 7 General] mmaestro:
Lag here, too

I've been seeing lag issues since I got the tablet. Seems to be a combination of things: it's worse if my storage is almost full (I loaded it up with movies for a flight almost as soon as I got it, it improved when I deleted some), and also certain push notifications and apps cause it to lag horribly. I had a big issue with NBC's Olympics apps, and Out of Milk, both of which like to run push notification services in the background 24/7. Facebook has a push service it runs periodically. I can actually go into my running apps, kill the service, and 90% of the time performance returns to normal. But sometimes it doesn't help. Really, really annoying.

Just ran Androbench to compare. I'm getting 2.6MB/s seq write and 0.06MB/s 17.77IOPS random write, FWIW. Storage lemon? Time to email Google and ask WTF?
[Nexus 7 General] CharliesTheMan:
Is your nexus 7 stock unrooted?
[Nexus 7 General] mmaestro:
Yes, stock unrooted.
[Nexus 7 General] mmaestro:
So I bit the bullet and factory reset. Speed afterwards is outstanding. Benchmarks are where they ought to be: 10-11MB/s write.

Interestingly, then I opened up Chrome to post this, set it to sync, and it's lag city. I'll have to see if that continues once I close the tab.
[Nexus 7 General] Semantics:
Mine lags, but I've never used an Android device that doesn't have lag, switching between screens, or using animations, so its no big deal to me. Project Butter, can use some more work. I love the hell out of my N7, and I despise Apple, but this is no iOS type smoothness.
[Nexus 7 General] Jay Aristide:
No lag, here... But, I've done quite a bit to ensure it. I started by updating to 4.1.1, then I installed _motley's linaro-optimized kernel, enabled init.d, turned on a 512mb zRam, remounted /data with noauto_da_alloc, turned off fsync, and switched my scheduler to deadline. I'm not over clocked in any way, and I'm undervolted by 100mV across the board. I have absolutely no lag to speak of, and the zRam allows me to seriously load down the OS..
[Nexus 7 General] kieso:
I'm the same as mmaestro. I purposely filled up my tablet with apps and games to see if the lag would start and it did. Lag while using apps and games and also the box popping up to wait or press OK to force close. This is common among all droids I have had. I thing Google still has a lot of work to do. Don't get me wrong I love the n7 but I thought project butter with 8000 processors would knock out any lag.
[Nexus 7 General] mparack:
Anyone got videos to demonstrate this lag? :confused:

Keep hearing about it but yet to see it.
[Nexus 7 General] Po1soNNN:
You guys are crazy this thing never lags :eek:
[Nexus 7 General] Dorkington:
Lots of lag here at times, as if the thing is running out of ram and processing power, but looking at usage apps, neither is happening. I imagine there will be an update soon to fix this. Hopefully. Otherwise everything is great.

16gb version, stock/unrooted with about 2gb free. I try to keep background tasks to a minimum, only one home screen has widgets (two gmail widgets, a calendar widget and a battery widget).

The lag was worse when I had less room left. I'll have to offload some comics, I guess if it's a storage thing... unfortunate.
[Nexus 7 General] Salty Wagyu:
Could just set up App Cache Cleaner to clean all app cache automatically every 3 days if that's the cause of lag. Better than the boot up method as most people don't really cold shutdown their device I'd imagine.
[Nexus 7 General] Jay Aristide:
Fair enough. I reboot mine at least once a day, just to refresh it :)
[Nexus 7 General] h00ligan:
How many of you without the lag have encryption on? It murders my io. I mean...one expects some cost but certainly not 90% performance hit.

http://xdaforums.com/showpost.php?p=31698855&postcount=17
[Nexus 7 General] Dorkington:
I'm "happy" to know that it's not me. Hopefully they'll have a fix for us 16gb users sometime soon. I guess I'll be storing less comics... This is a bit disappointing. Almost no reason to buy the 16gb version if you can't use it.
[Nexus 7 General] E_Goldstein:
Maybe its time for a hard reset and try some of this tricks.... oh and i have 7gig free, stock rom rooted :(
[Nexus 7 General] pro4ever:
thinking bout getting one but listening to members with problems like lag etc is putting me off how wide spread is it?
[Nexus 7 General] Kumnaa:
It doesn't seem to be too widespread. They don't seem to have been able to replicate it and google and the bug reports don't have a large number of people chiming in.
[Nexus 7 General] pro4ever:
decided not to go for it unfortunately:( was looking forward to it but the stories about it no good
[Nexus 7 General] khaytsus:
More like the power users are chiming in, the other 98% don't know the difference, have returned the device, haven't filled it up, etc..

Every time you see data in a forum, be it like XDA or Google's forums, you're generally seeing the upper cut of the technical folks and/or power users.

Looking around here sometimes, it's scary what doesn't make the cut, eh?
[Nexus 7 General] pro4ever:
what is ur experience with the nexus 7?
[Nexus 7 General] garryknight:
I had the lag and I think I might have fixed it - for me, anyway. I think the cause is probably different for people's different uses of the tablet.

When I first noticed it, I searched this thread and found the advice to stop Currents from background syncing. I did that and the lag decreased, though it didn't go away entirely. I was thinking about this recently when I found myself doing what I always have to do when using G+ in Chrome on my Ubuntu PC, which is to keep closing the G+ tab then reopening it again. The reason I do this is that G+ keeps stuffing new posts onto the front of the feed but not removing them from the end. After an hour or so the feed is so long I have to hire an Australian to read the bottom end of it for me. I first noticed this behaviour when I got pop-up notices saying that Chrome was using a large amount of memory. Closing the tab and reopening it causes Chrome to flush its cache for that tab and reload it, but far fewer posts get loaded, so the cache ends up smaller.

I went into Settings, Applications on my N7 and had a look at the cache size for the G+ app and it said that it was over 850MB in size! After clearing it plus a few others that were over 100MB in size (Instagram and the Guardian app, for example) I found that the tablet was once again about as snappy as the ingredients of turtle soup.

Obviously I can't guarantee that this will make your N7 as snappy as a paparazzo on crack, but it's worth a try, yes?
[Nexus 7 General] pro4ever:
its a risk i did not know bout the lag untill today and pick up tomorrow tesco direct ! im still leaning towards giving it back stright way and refund :confused: