Re: [squid-users] Performance Troubleshooting

Several benchmarks that I've seen on the web give the following rankings
to the various Linux file systems.

        JFS
        XFS The ranking of XFS and ReiserFS seems to be
        ReiserFS switched among the various benchmarks
        EXT2
        EXT3

At any rate, the EXT3 file system is reported, generally, to be
significantly slower than the other choices. ReiserFS might be the best
choice for a Squid environment where there are a lot of "goo-gahs" on a
page.

Merton Campbell Crockett

On Tue, 13 Jul 2004, Sturgis, Grant wrote:

> Greetings List,
>
> I recently moved our squid installation from SuSE 8 to RHEL ES 3 and
> the performance has decreased significantly. I am looking here for
> pointers of what you think may be the difference. I attempted to keep
> the configuration largely the same, and the hardware is 100% the same
> (same system).
>
> The performance with SuSE:
>
> peak median response time = .250 s
> peak requests per minute = 930
>
> Now on RHEL ES 3:
>
> peak median response time > .800 s
> same numbers of requests per minute
>
> We are using a ton of memory, but I think we are in good shape:
>
> Page faults with physical i/o: 553
> Number of HTTP requests received: 2975409
>
> [me@proxy home]$ free -m
> total used free shared buffers cached
> Mem: 3778 3709 69 0 415 2209
> -/+ buffers/cache: 1084 2694
> Swap: 8997 5 8992
>
> I am not running named on this system, so I am wondering if this is an area for improvement. How do these DNS times look?:
>
> DNS Lookups: 0.05313 0.06657
>
> One thing that I know is different is the file system of the cache_dirs. They are now ext3 while before they were reiserfs, store io type is aufs.
>
> I did not attempt to preserve the cache_dirs so the cache before was 2 x 45 GB while the cache now has grown to only 2 x 3,259 MB (online about 2 weeks now).
>
> Does anyone have any suggestions for me?
>
> Many thanks in advance,
>
> Grant
>
>
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