Re: [squid-users] Poor performance of squid-2.5 on Redhat 7.2 compared to Solaris 8 on x86

It is a known quantity, at this point, Dan. Not much to debate.

aufs is faster than diskd, which is faster than ufs. The difference
between aufs and diskd is probably about 20% (and the difference between
ufs and either of the asynchronous disk types varies based on number of
disks, underlying filesystem and probably CPU speed, but it can be quite
large--on the order of 100%+ with a large number of disks, or as little
as 30% for a single disk).

In reality, for many users it makes very little difference which store
type you use. It only matters when you begin to hit pretty high traffic
loads (in the Mbps range). If you've only got fifteen users, or even 50
users, any of the store types should work fine.

That said, I always use aufs. Don't specify the number of threads when
configuring however, unless you know what you're doing (and even if you
think you know what you're doing you probably still shouldn't alter it
from the default). Squid will automatically use 16 threads per disk,
which is a pretty good number for most modern hardware.

Dan Cave wrote:
> Mahmoud
>
> I am very interested to read that async-io=32 is better than diskd, but I am curious to know how you know this has
> increased the performance of requests/hits p/sec this gives over diskd.
>
> Cheers in advance
>
> Dan
>
> On Mon, Jul 01, 2002 at 10:29:15AM +0430, Account For Cache Group wrote:
>
>>I compile most of my squid box with this option, and I have not gotten any
>>serious bug yet.
>>as you know there are some other technique to reach a better performance
>>
>>1. set half_close_client off
>>2. client and server persistent_connection on
>>3. decread fin_timeout timeout (/proc/sys/net/ipv4/tcp_fin_timeout)
>>4. incread read/write tcp buffer ( ..../tcp_wmem, /tcp_rmem)
>>5. disable timestampes
>>6. incread tcp_max_syn_backlog
>>7. and ... you can find them in Securing and Optimizing Linux book
>>
>>Mahmoud Taghizadeh

-- 
Joe Cooper <joe@swelltech.com>
Web caching appliances and support.
http://www.swelltech.com