Re: [squid-users] tune up

Wennie V. Lagmay wrote:

> Since im using diskd and im going to change it to aufs do i need to
> recompile the squid? if so is there other way of enabling aufs without
> recompliling? also can I change my configuration from diskd to aufs
> directly?
>
> thanks,
>
> wennie
>
>
> ----- Original Message ----- From: "Steven Wilton" <swilton@q-net.net.au>
> To: <squid-users@squid-cache.org>
> Sent: Monday, May 30, 2005 10:42 AM
> Subject: RE: [squid-users] tune up
>
>
>>
>> If you're referring to my postings about a month ago, I've been doing
>> some
>> further tests after getting some pointers from different people, and the
>> results are different.
>>
>> We have a number of sets of proxies in different locations, each set
>> being
>> load-balanced using wccp and layer 3 switch. My results were
>> different when
>> comapring caches with lower loads (Avg 39 req/sec, peak 70 req/sec) than
>> when I was comparing caches with higher loads (170 req/sec avg, peak
>>
>>> 300req/sec).
>>
>>
>> I was using the aufs cache_dir type, as I have found this to be
>> significantly faster than diskd when running on linux. The different
>> paramaters that I was comparing were the load average (with aufs, as
>> disk
>> i/o increases, there will be more threads waiting on disk i/o, which
>> will
>> push the load average up), the disk utilisation (% time each disk had
>> active
>> operations) and cpu utilisation.
>>
>> I found that under low loads, ext3 mounted with data=writeback (the same
>> level of data protection as other journalled filesystems) gave the best
>> numbers (ie lower CPU, lower disk utilisation and lower load average.
>>
>> I found that on our more loaded systems, reiserfs had lower disk
>> utilisation
>> and a lower load average, at a slight cost of CPU time.
>>
>> So, if the disk i/o is going to be a bottleneck (as it is in our case),
>> reiserfs is probably a better choice. If CPU is the main bottleneck,
>> then
>> ext2/3 may be the best choice.
>>
>> It also looks like reiserfs may use more resources under low load, but
>> scales better at the higher loads. This confirms the results of
>> previous
>> benchmarks that show reiserfs to provide the highest throughput for a
>> squid
>> proxy server (using the Web Polygraph program).
>>
>> Steven
>>
>>> -----Original Message-----
>>> From: Wennie V. Lagmay [mailto:wlagmay@yanbulink.net]
>>> Sent: Monday, May 30, 2005 12:49 PM
>>> To: Henrik Nordstrom
>>> Cc: Henrik Nordstrom; azeem ahmad; squid-users@squid-cache.org
>>> Subject: Re: [squid-users] tune up
>>>
>>> Another question, regarding file system, Im using reisersfs
>>> for my cache
>>> partition and I've read that ext3 is faster than reiserfs, If
>>> it so, is
>>> there a way or an option to make reiserfs as fast as ext3?
>>> what are the
>>> parameters to be used for fstab to make reiserfs fast?
>>>
>>> In your experience which is the best file system for squid?
>>>
>>> Thank you very much,
>>>
>>> wennie
>>> ----- Original Message ----- From: "Henrik Nordstrom"
>>> <hno@squid-cache.org>
>>> To: "Wennie V. Lagmay" <wlagmay@yanbulink.net>
>>> Cc: "Henrik Nordstrom" <hno@squid-cache.org>; "azeem ahmad"
>>> <azeem81@msn.com>; <squid-users@squid-cache.org>
>>> Sent: Saturday, May 28, 2005 6:41 PM
>>> Subject: Re: [squid-users] tune up
>>>
>>>
>>> > On Sat, 28 May 2005, Wennie V. Lagmay wrote:
>>> >
>>> >> Its only now that I knew this cache_dir issue, Im using
>>> FC2 64 bit and
>>> >> using diskd for my cache_dir. Is ther a way to migrate my
>>> cache_dir to
>>> >> aufs without harming my cache server.
>>> >
>>> > Yes. Modify squid.conf and restart your Squid.
>>> >
>>> >> cache_dir aufs /cache1/spool/squid 25000 16 256
>>> >> cache_dir aufs /cache2/spool/squid 25000 16 256
>>> >> cache_dir aufs /cache3/spool/squid 25000 16 256
>>> >
>>> > Regards
>>> > Henrik
>>>
>>>
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>>>
>>
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>>
>
>
>
I'm affraid you have to recompile squid if you didnt enable aufs
eariler, you can check squid compilation option with "squid -v" , see if
there "--enable-storeio=aufs,coss,diskd,ufs"
Again if you don't see aufs support then don't hestitate to recompile squid.

regards

askar
Received on Mon May 30 2005 - 06:15:07 MDT