From: bert hubert <ahu@ds9a.nl>
To: riel@conectiva.com.br, akpm@digeo.com,
linux-kernel@vger.kernel.org, albert@users.sf.net
Subject: Re: 2.5.44 io accounting weirdness, bi & bo swapped?
Date: Wed, 23 Oct 2002 14:48:19 +0200 [thread overview]
Message-ID: <20021023124819.GA32421@outpost.ds9a.nl> (raw)
In-Reply-To: <20021023121347.GA31763@outpost.ds9a.nl>
On Wed, Oct 23, 2002 at 02:13:47PM +0200, bert hubert wrote:
> It appears as if the kernel does its accounting wrong in some places. For
> example, with procps 3.0.4, dd if=/dev/zero of=/mnt/100mb bs=1024
> count=100000 causes large 'bi' readings:
My bad. In this case, what I thought of as sane:
> However, mmapping a file and touching 100mb of pages does the following,
> which looks sane:
>
> r b w swpd free buff cache si so bi bo in cs us sy id
> 1 0 1 14320 7972 1952 146560 0 0 0 1912 1279 277 2 53 45
Is not. Touching a page entails reading it. In Albert's procps with 2.5.44,
bi and bo are reversed. Rik's vmstat does report things correctly.
Because I saw vmstat sometimes being right and sometimes being wrong, I
derived that is was the kernel that was at fault.
Perhaps Albert's procps isn't ready for 2.5.44?
Regards,
bert hubert
--
http://www.PowerDNS.com Versatile DNS Software & Services
http://lartc.org Linux Advanced Routing & Traffic Control HOWTO
next prev parent reply other threads:[~2002-10-23 12:42 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-23 12:13 bert hubert
2002-10-23 12:48 ` bert hubert [this message]
2002-10-23 14:56 ` Rik van Riel
2002-10-23 22:25 ` Albert D. Cahalan
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