linux-kernel - Re: Xen paravirt frontend block hang

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Message-ID: <47C9F818.4020200@theshore.net>
Date:	Sat, 01 Mar 2008 19:43:04 -0500
From:	"Christopher S. Aker" <caker@...shore.net>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	virtualization@...ts.linux-foundation.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Xen-devel <xen-devel@...ts.xensource.com>
Subject: Re: Xen paravirt frontend block hang

Jeremy Fitzhardinge wrote:
> I've been running this all night without seeing any problem.  I'm using 
> current x86.git#testing with a few local patches, but nothing especially 
> relevent-looking.

Meh .. what backend are you using?  We're using LVM volumes exported 
directly into the domUs like so:

disk =[ 'phy:vg1/xencaker-56392,xvda,w', ... ]

> Could you try the attached patch to see if it makes any difference?

Unfortunately we're still in the same place... pv_ops kernels are still 
hanging after heavy disk IO:

works - 2.6.18.x (from xen-unstable)
hangs - 2.6.25-rc3-git3
hangs - 2.6.25-rc3-git3 + your patch

Any other suggestions or debugging I can provide that would be useful to 
squash this?

-Chris

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