Does Cyrus benefit greatly from increased FS buffer cache?

[Sebastian Hagedorn]

--On 16. April 2009 10:58:15 +1000 Rob Mueller <robm at fastmail.fm> wrote:

>> http://blog.fastmail.fm/2007/09/21/reiserfs-bugs-32-bit-vs-64-bit-kernel
>> s-cache-vs-inode-memory/
>>
>> Anyone have any specific thoughts?  Is there any other benefit we might
>> see from large memory allocation in 64-bit architecture?
>
> Given that I wrote that blog post, I can only tell you that in our
> environment, 64-bit kernels made a big difference.

I wonder if ext3 behaves differently, Red Hat's 32-bit behaves differently, 
or if something altogether different is going on. We are currently running 
RHEL 3 in 32-bit mode, our servers have 16 GB, and most of it is used for 
caching:

# free
             total       used       free     shared    buffers     cached
Mem:      16214344   16197612      16732          0      86944   13415172
-/+ buffers/cache:    2695496   13518848
Swap:      4192944       8436    4184508

So it would seem that a 64-bit kernel wouldn't improve on that, right? Or 
is that a difference between 2.4 and 2.6?
-- 
     .:.Sebastian Hagedorn - RZKR-R1 (Gebäude 52), Zimmer 18.:.
                 .:.Regionales Rechenzentrum (RRZK).:.
.:.Universität zu Köln / Cologne University - ✆ +49-221-478-5587.:.
                   .:.:.:.Skype: shagedorn.:.:.:.
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