This new access control element type allows you to use the request content-type in access controls. If the ICMP database reports that the round-trip time to the origin server is less than this limit, then the request is sent directly to the origin server, rather than a neighbor cache. Unknown methods are denied, unless you add them to this list. If you set this option, Squid will print a warning to cache.log and syslog if the memory usage goes above this limit. The default is least-load .
Shared memory is used for reading and writing data buffers.
For more information, please see the Diskd FAQ section . If you want to run Squid as a proxy, without caching anything, then the null storage type may be useful. Although it won't use any disk space, it still keeps some statistics that you might like to have. The default is ufs , which is highly recommend for new users. The other modules may not work for all users.