Re: Compiling for COSS (was Re: squid-2.4stable2 ?)

From: Henrik Nordstrom <hno@dont-contact.us>
Date: Tue, 21 Aug 2001 06:39:14 +0200

Joe Cooper wrote:

> Is noatime still appropriate/necessary for a COSS object store? I'm
> guessing it would be (and I can't test it on my current test machine
> since my COSS dir is on a normal partition with other normal system stuff).

noatime should not matter much for COSS. It is a problem for the "ufs" family
of stores because of the amount of inodes being touched by atime, but for
COSS there only is one inode.

> Is there anything else that ought to be altered on the system to
> optimize for this kind of workload? Perhaps increasing the disk flush
> buffers, such that writes/reads are more aggregated?

The defaults of Linux should work pretty fine I think.

> Interrupts are still going extraordinarily high on write flushes (like
> 12000-16000 showing up on a 'vmstat 1'). Context switches aren't bad
> though...I would have thought not being kernel level aio would cause
> extra context switches...but then I'm ignorant on this subject so can't
> really judge how things ought to be behaving.

Are you using IDE PIO? If so, try DMA.
Received on Mon Aug 20 2001 - 22:51:23 MDT

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