From: Michael Frank <mhf@linuxmail.org>
To: Nick Piggin <piggin@cyberone.com.au>, cliff white <cliffw@osdl.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: 2.6.0-test8/test9 io scheduler needs tuning?
Date: Tue, 28 Oct 2003 12:13:31 +0800 [thread overview]
Message-ID: <200310281213.31709.mhf@linuxmail.org> (raw)
In-Reply-To: <3F9DAF2C.8010308@cyberone.com.au>
On Tuesday 28 October 2003 07:50, Nick Piggin wrote:
>
> cliff white wrote:
>
> >On Tue, 28 Oct 2003 05:52:45 +0800
> >Michael Frank <mhf@linuxmail.org> wrote:
> >
> >
> >>To my surprise 2.6 - which used to do better then 2.4 - does no longer
> >>handle these test that well.
> >>
> >>Generally, IDE IO throughput is _very_ uneven and IO _stops_ at times with the
> >>system cpu load very high (and the disk LED off).
> >>
> >>IMHO the CPU scheduling is OK but the IO scheduling acts up here.
> >>
> >>The test system is a 2.4GHz P4 with 512M RAM and a 55MB/s udma IDE harddisk.
> >>
> >>The tests load the system to loadavg > 30. IO should be about 20MB/s on avg.
> >>
> >>Enclosed are vmstat -1 logs for 2.6-test9-Vanilla, followed by 2.6-test8-Vanilla
> >>(-mm1 behaves similar), 2.4.22-Vanilla and 2.4.21+swsusp all compiled wo preempt.
> >>
> >>IO on 2.6 stops now for seconds at a time. -test8 is worse than -test9
> >>
> >
> >We see the same delta at OSDL. Try repeating your tests with 'elevator=deadline'
> >to confirm.
> >For example, on the 8-cpu platform:
> >STP id Kernel Name MaxJPM Change Options
> >281669 linux-2.6.0-test8 7014.42 0.0
> >281671 linux-2.6.0-test8 8294.94 +18.26% elevator=deadline
> >
> >The -mm kernels don't show this big delta. We also do not see this delta on
> >smaller machines
> >
>
> I'm working with Randy to fix this. Attached is what I have so far. See how
> you go with it.
>
>
This has been done without running a kernel compile, by $ ti-tests/ti stat ub17 ddw 4 5000
Seems to be more even on average but still drops IO too low and then gets overloaded.
By "too low" I mean io bo less than 10000.
By overloaded I mean io bo goes much above 40000. The disk can do maybe 60000.
When io bo is much above 40000, cpu scheduling is being impaired as indicated
by vmstat stopping output for a second or so...
Regards
Michael
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procs memory swap io system cpu
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procs memory swap io system cpu
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25 3 2 0 22224 62020 94496 0 0 4 19092 1179 2317 28 72 0
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19 0 1 0 19208 62116 92132 0 0 0 8208 1248 87596 25 75 0
next prev parent reply other threads:[~2003-10-28 4:14 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-10-27 21:52 2.6.0-test8/test9 io scheduler needs tuning? Michael Frank
2003-10-27 22:55 ` cliff white
2003-10-27 23:50 ` Nick Piggin
2003-10-28 1:37 ` Nigel Cunningham
2003-10-28 1:48 ` Nick Piggin
2003-10-28 2:58 ` Michael Frank
2003-10-28 2:57 ` Michael Frank
2003-10-28 3:31 ` Nigel Cunningham
2003-10-28 3:54 ` Nick Piggin
2003-10-28 7:48 ` Michael Frank
2003-10-28 4:13 ` Michael Frank [this message]
2003-10-28 4:30 ` Nick Piggin
2003-10-28 6:11 ` Michael Frank
2003-10-28 17:42 ` Martin Josefsson
2003-10-28 17:26 ` cliff white
2003-10-28 21:18 ` Dave Olien
2003-10-29 2:40 ` Nick Piggin
2003-10-29 4:56 ` Michael Frank
2003-10-29 16:47 ` Michael Frank
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