Date: Wed, 14 Jan 2004 12:29:20 +0100
From: Haakon Riiser <hakonrk@ulrik.uio.no>
To: linux-kernel@vger.kernel.org
Subject: Re: Busy-wait delay in qmail 1.03 after upgrading to Linux 2.6
Message-ID: <20040114112920.GB298@s.chello.no>
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References: <20040113210923.GA955@s.chello.no> <20040113135152.3ed26b85.akpm@osdl.org> <20040113232624.GA302@s.chello.no> <20040113154348.5542cb7b.akpm@osdl.org> <20040114000746.GA691@s.chello.no>
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I have some more info on this bug:

Apparently, lock/trigger is a named pipe that connects to
qmail-send.  I immediately tried stracing qmail-send while sending
the test message, but unfortunately, the bug is not reproducible
while qmail-send is straced.  The entire process is almost as
fast as it is under 2.4 when I strace qmail-send.

At least now we have a temporary workaround:

  strace -p $(pidof qmail-send) -o /dev/null &

:-)

Btw, the output from strace -p $(pidof qmail-send) can be viewed here:
(probably not interesting though, since the bug is not reproduced
under strace)

  http://home.chello.no/~hakonrk/qmail-send.st.out.gz

-- 
 Haakon
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