From: Martin Schwidefsky <schwidefsky@de.ibm.com>
To: Andrew Morton <akpm@osdl.org>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, piggin@cyberone.com.au
Subject: Re: blk_congestion_wait racy?
Date: Thu, 11 Mar 2004 20:04:21 +0100 [thread overview]
Message-ID: <OFF79FE9F7.73A1504E-ONC1256E54.006825BF-C1256E54.0068C4F9@de.ibm.com> (raw)
> Yes, sorry, all the world's an x86 :( Could you please send me whatever
> diffs were needed to get it all going?
I am just preparing that mail :-)
> I thought you were running a 256MB machine? Two seconds for 400 megs of
> swapout? What's up?
Roughly 400 MB of swapout. And two seconds isn't that bad ;-)
> An ouch-per-second sounds reasonable. It could simply be that the CPUs
> were off running other tasks - those timeout are less than scheduling
> quanta.
I don't understand why an ouch-per-second is reasonable. The mempig is
the only process that runs on the machine and the blk_congestion_wait
uses HZ/10 as timeout value. I'd expect about 100 ouches for the 10
seconds the test runs.
The 4x performance difference remains not understood.
blue skies,
Martin
Linux/390 Design & Development, IBM Deutschland Entwicklung GmbH
Schonaicherstr. 220, D-71032 Boblingen, Telefon: 49 - (0)7031 - 16-2247
E-Mail: schwidefsky@de.ibm.com
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next reply other threads:[~2004-03-11 19:04 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-11 19:04 Martin Schwidefsky [this message]
2004-03-11 23:25 ` Andrew Morton
2004-03-12 2:31 ` Nick Piggin
-- strict thread matches above, loose matches on Subject: below --
2004-03-11 18:24 Martin Schwidefsky
2004-03-11 18:55 ` Andrew Morton
2004-03-09 17:54 Martin Schwidefsky
2004-03-10 5:23 ` Nick Piggin
2004-03-10 5:35 ` Andrew Morton
2004-03-10 5:47 ` Nick Piggin
2004-03-08 13:38 Martin Schwidefsky
2004-03-08 23:50 ` Nick Piggin
2004-03-08 9:59 Martin Schwidefsky
2004-03-08 12:24 ` Andrew Morton
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