From: Martin Bligh <mbligh@mbligh.org>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Arjan van de Ven <arjan@infradead.org>,
Erik Mouw <erik@harddisk-recovery.com>,
Andrew Morton <akpm@osdl.org>,
Jason Schoonover <jasons@pioneer-pra.com>,
linux-kernel@vger.kernel.org
Subject: Re: High load average on disk I/O on 2.6.17-rc3
Date: Mon, 08 May 2006 19:02:18 -0700 [thread overview]
Message-ID: <445FF82A.2080106@mbligh.org> (raw)
In-Reply-To: <445FF714.4050803@yahoo.com.au>
Nick Piggin wrote:
> Arjan van de Ven wrote:
>
>>> ... except that any kernel < 2.6 didn't account tasks waiting for disk
>>> IO.
>>>
>>
>> they did. It was "D" state, which counted into load average.
>>
>
> Perhaps kernel threads in D state should not contribute toward load avg.
>
> Userspace does not care whether there are 2 or 20 pdflush threads waiting
> for IO. However, when the network/disks can no longer keep up, userspace
> processes will end up going to sleep in writeback or reclaim -- *that* is
> when we start feeling the load.
Personally I'd be far happier having separated counters for both. Then
we can see what the real bottleneck is. Whilst we're at it, on a per-cpu
and per-elevator-queue basis ;-)
M.
next prev parent reply other threads:[~2006-05-09 2:02 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-05 17:10 High load average on disk I/O on 2.6.17-rc3 Jason Schoonover
2006-05-06 23:03 ` bert hubert
2006-05-07 1:02 ` Jason Schoonover
2006-05-07 10:54 ` bert hubert
2006-05-07 16:50 ` Andrew Morton
2006-05-07 17:24 ` Jason Schoonover
2006-05-08 11:13 ` Erik Mouw
2006-05-08 11:22 ` Arjan van de Ven
2006-05-08 11:28 ` Russell King
2006-05-08 11:38 ` Avi Kivity
2006-05-08 12:37 ` Arjan van de Ven
2006-05-09 14:37 ` Bill Davidsen
2006-05-08 14:24 ` Martin J. Bligh
2006-05-08 14:55 ` Arjan van de Ven
2006-05-08 15:22 ` Erik Mouw
2006-05-08 15:25 ` Martin J. Bligh
2006-05-08 15:31 ` Arjan van de Ven
2006-05-08 15:42 ` Erik Mouw
2006-05-08 16:02 ` Martin J. Bligh
2006-05-08 16:02 ` Miquel van Smoorenburg
2006-05-08 16:47 ` Russell King
2006-05-08 17:04 ` Gabor Gombas
2006-05-08 17:18 ` Mike Galbraith
2006-05-09 1:57 ` Nick Piggin
2006-05-09 2:02 ` Martin Bligh [this message]
2006-05-09 2:16 ` Nick Piggin
2006-05-09 4:36 ` Arjan van de Ven
2006-05-09 4:46 ` Nick Piggin
2006-05-09 5:27 ` Hua Zhong
2006-05-09 5:03 ` David Lang
2006-05-15 7:46 ` Sander
2006-05-08 22:24 ` Bernd Eckenfels
2006-05-08 22:39 ` Lee Revell
2006-05-09 0:08 ` Peter Williams
2006-05-09 18:33 ` Bill Davidsen
[not found] <69c8K-3Bu-57@gated-at.bofh.it>
2006-05-05 23:12 ` Robert Hancock
2006-05-06 4:39 ` Jason Schoonover
2006-05-06 17:20 ` Robert Hancock
2006-05-06 18:23 ` Jason Schoonover
2006-05-06 20:01 ` Robert Hancock
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