linux-kernel - Puzzling lag in some syscalls

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Message-ID: <20070529212920.GD31507@obiwan.tataz.chchile.org>
Date:	Tue, 29 May 2007 23:29:20 +0200
From:	Jeremie Le Hen <jeremie@...hen.org>
To:	linux-kernel@...r.kernel.org
Cc:	jeremie@...hen.org
Subject: Puzzling lag in some syscalls

Hi,

Please Cc: me when replying, since I'm not subscribed.

I dare to ask this here because I have a problem that seems to be
either kernel or hardware related.  Unfortunately I can't see any
error message to direct me for further investigation.

I'm using 2.6.18-4-686 (Debian's kernel), but I've tried with 2.6.16.49
and 2.6.20.7 without success.

The problem is a big lag (more that 10 or 20 seconds) for some system
calls, for numerous unrelated applications (top, vim, apt-cache).
What is even more puzzling is that once the application has successfully
started, I can run it again without any lag.

I've used strace to catch a few lags.  "strace -fttT" has been used.
Note that you can view the content of these files directly in your
browser:

msync(0xb708f000, 8536, MS_SYNC), line 146/1035
http://tataz.chchile.org/~tataz/strace/strace.apt-cache.gz

select(0, NULL, NULL, NULL, {0, 500000}), line 575/1793
http://tataz.chchile.org/~tataz/strace/strace.top.gz

read(3, "diff --git a/.gitignore b/.gitig"..., 8192), line 797/2443
http://tataz.chchile.org/~tataz/strace/strace.vim.gz

Thank in advance.
Best regards,
-- 
Jeremie Le Hen
< jeremie at le-hen dot org >< ttz at chchile dot org >
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