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Re: [Xen-devel] Re: Xen paravirt frontend block hang

To: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Subject: Re: [Xen-devel] Re: Xen paravirt frontend block hang
From: "Christopher S. Aker" <caker@xxxxxxxxxxxx>
Date: Mon, 24 Mar 2008 21:37:42 -0400
Cc: xming <xmingske@xxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx
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Jeremy Fitzhardinge wrote:
Christopher S. Aker wrote:
Jeremy Fitzhardinge wrote:
Are you running an SMP or UP domain? I found I could get hangs very easily with UP (but I need confirm it isn't a result of some other very experimental patches).

The hang occurs with both SMP and UP compiled pv_ops kernels. SMP kernels are still slightly responsive after the hang occurs, which makes me think only one proc gets stuck at a time, not the entire kernel.

The patch I posted yesterday - "xen: fix RMW when unmasking events" - should definitively fix the hanging-under-load bugs (I hope).

Confirmed-by: caker@xxxxxxxxxxxx

Nice work!

-Chris


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