From: Manfred Spraul <manfred@colorfullife.com>
To: Dimitri Sivanich <sivanich@sgi.com>
Cc: linux-kernel@vger.kernel.org, lse-tech <lse-tech@lists.sourceforge.net>
Subject: Re: [PATCH]: Option to run cache reap in thread mode
Date: Wed, 16 Jun 2004 19:23:49 +0200 [thread overview]
Message-ID: <40D08225.6060900@colorfullife.com> (raw)
Dimitri wrote:
>In the process of testing per/cpu interrupt response times and CPU availability,
>I've found that running cache_reap() as a timer as is done currently results
>in some fairly long CPU holdoffs.
>
What is fairly long?
If cache_reap() is slow than the caches are too large.
Could you limit cachep->free_limit and check if that helps? It's right
now scaled by num_online_cpus() - that's probably too much. It's
unlikely that all 500 cpus will try to refill their cpu arrays at the
same time. Something like a logarithmic increase should be sufficient.
Do you use the default batchcount values or have you increased the values?
I think the sgi ia64 system do not work with slab debugging, but please
check that debugging is off. Debug enabled is slow.
--
Manfred
next reply other threads:[~2004-06-16 17:25 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-06-16 17:23 Manfred Spraul [this message]
2004-06-16 18:02 ` [PATCH]: Option to run cache reap in thread mode Dimitri Sivanich
2004-06-16 18:58 ` Manfred Spraul
2004-06-17 13:10 ` Dimitri Sivanich
2004-06-18 4:40 ` Andrew Morton
2004-06-18 14:33 ` Dimitri Sivanich
2004-06-18 20:40 ` Andrew Morton
2004-06-18 21:04 ` Manfred Spraul
2004-06-18 21:44 ` Dimitri Sivanich
2004-06-18 22:03 ` Andrew Morton
-- strict thread matches above, loose matches on Subject: below --
2004-06-16 16:43 Mark_H_Johnson
[not found] <27JKg-4ht-11@gated-at.bofh.it>
2004-06-16 16:22 ` Andi Kleen
2004-06-16 18:16 ` Dimitri Sivanich
2004-06-16 14:24 Dimitri Sivanich
2004-06-16 15:29 ` Christoph Hellwig
2004-06-16 16:03 ` Dimitri Sivanich
2004-06-16 16:07 ` Christoph Hellwig
2004-06-16 16:25 ` Jesse Barnes
2004-06-16 16:51 ` Dimitri Sivanich
2004-06-16 16:46 ` Lori Gilbertson
2004-06-16 16:53 ` Christoph Hellwig
2004-06-16 21:30 ` Andrew Morton
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