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Date:	Fri, 20 Apr 2007 16:39:27 -0400 (EDT)
From:	James Morris <jmorris@...ei.org>
To:	netdev@...r.kernel.org
Subject: FYI: Xen or kernel bug? (fwd)

Could be an upstream kernel issue lurking.


---------- Forwarded message ----------
Date: Fri, 20 Apr 2007 22:21:26 +0200
From: Mark Stier <markstier@...il.com>
To: linux-kernel@...r.kernel.org
Subject: FYI: Xen or kernel bug?

Hello,

tcp_vegas produces division by zero kernel oopses in dom0 when running
a Xen-patched 2.6.16.28 kernel. I have tracked down the problem to
line #256 in tcp_vegas.c: presumably due to flaky Xen timing, the rtt
seems to get zero from time to time (adding 1 to the rtt variable
solves the problem for me). The same should apply to line #140 in
tcp_veno.c, too.

Best regards,
Mark
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