From: hopper@cs.ucsd.edu (Steve Hopper)
Newsgroups: comp.sys.sun.hardware
Subject: 3-160 -> 3-280 u/g slows system.
Date: 28 Sep 92 21:21:36 GMT
Organization: CSE Dept., U.C. San Diego
Originator: hopper@empyrean.ucsd.edu





We replaced the CPU (and memory) in a 3-160 with a 3-280 and immediately
noticed a significant reduction in overall response, everything from
logins to 'w' requests etc.  The machine originally had only 8MB and 
now has 16MB of compatible memory.

The backplane is the same for both machine types and the kernel was
reconfigured for the 280.

The machine has the CPU in slot 1, the second memory in slot 2, the first
memory in slot 6 (terminated) and two xylogics 451s in slots 7 & 8.

The CPU board was swapped with no change noticed.

vmstat shows:

(there were only 6 users logged in with 5 idle.

 procs     memory              page               disk       faults     cpu
 r b w   avm   fre  re at  pi  po  fr  de  sr x0 x2 d2 d3  in  sy  cs us sy id
 0 0 0     0  4912   0  0   0   0   0   0   0  0  0  0  0   3  51   6  4  5 91
 0 0 0     0  4912   0  0   0   0   0   0   0  0  0  0  0   4  54   9  6  8 87
 0 0 0     0  4912   0  0   0   0   0   0   0  0  0  0  0   4  58  10  6  2 92
 0 0 0     0  4912   0  0   0   0   0   0   0  0  0  0  0   4  58  10  4  2 94
 0 0 0     0  4912   0  0   0   0   0   0   0  0  0  0  0   3  57   9  4  2 94
 0 0 0     0  4912   0  0   0   0   0   0   0  0  0  0  0   3  56   8  4  2 94
 0 0 0     0  4912   0  0   0   0   0   0   0  0  0  0  0   3  58   9  4  6 91
 0 0 0     0  4912   0  0   0   0   0   0   0  0  0  0  0   3  60   9  4  6 91
 0 0 0     0  4912   0  0   0   0   0   0   0  0  0  0  0   3  63   9  6  6 89
 0 0 0     0  4912   0  0   0   0   0   0   0  0  0  0  0   3  56   8  4  4 92
 0 0 0     0  4912   0  0   0   0   0   0   0  0  0  0  0   2  56   8  6  2 92
 0 0 0     0  4912   0  0   0   0   0   8   0  0  0  0  0   2  56   8  6 13 81
 0 0 0     0  4912   0  0   0   0   0   0   0  0  0  0  0   2  60   8  4  4 92
 0 0 0     0  4912   0  0   0   0   0   0   0  0  0  0  0   2  58   7  6  0 94
 0 0 0     0  4912   0  0   0   0   0   0   0  0  0  0  0   2  57   7  2  4 94
 1 0 0     0  4912   0  0   0   0   0   0   0  0  0  0  0   2  50   6  4  4 92
 1 0 0     0  4912   0  0   0   0   0   0   0  0  0  0  0   2  51   6  4  6 91
 1 0 0     0  4912   0  0   0   0   0   0   0  0  0  0  0   2  52   6  4  4 93
 1 0 0     0  4912   0  0   0   0   0   0   0  0  0  0  0   2  52   5  4  4 93
 procs     memory              page               disk       faults     cpu
 r b w   avm   fre  re at  pi  po  fr  de  sr x0 x2 d2 d3  in  sy  cs us sy id
 0 0 0     0  4912   0  0   0   0   0   8   0  0  1  0  0   2  56   6  9 28 64
 0 0 0     0  4912   0  0   0   0   0   0   0  0  0  0  0   8  94  14 30 55 14
 0 0 0     0  4912   0  0   0   0   0   0   0  0  0  0  0  24 129  31 57 34  9
 0 0 0     0  4912   0  0   0   0   0   0   0  0  0  0  0  35 159  42 36 60  4
 0 0 0     0  4912   0  0   0   0   0   0   0 40  1  0  0  32 181  39  9 60 31
 2 1 0     0  4864   0  0   0   0   0   0   0 11  2  0  0  37 137  30  2 36 62
 2 1 0     0  4864   0  0   0   0   0   0   0  0  0  0  0  31 147  32 34 57  9
 2 1 0     0  4864   0  0   0   0   0   0   0  0  0  0  0  26 220  31  6 62 32
 2 1 0     0  4864   0  0   0   0   0   0   0  0  0  0  0  21 189  26  6  0 94


Any ideas why this is happening???

Steve