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Re: kern/41679 (Lots of re0: watchdog timeout using qemu/kvm)

The following reply was made to PR kern/41679; it has been noted by GNATS.

From: Stephen Borrill <>
Subject: Re: kern/41679 (Lots of re0: watchdog timeout using qemu/kvm)
Date: Fri, 2 May 2014 14:09:39 +0100 (BST)

 On Fri, 2 May 2014, Stephen Borrill wrote:
 >> On Sun, Dec 30, 2012 at 08:40:04AM +0000, Izumi Tsutsui wrote:
 >> > > Synopsis: Lots of re0: watchdog timeout using qemu/kvm
 >> >
 >> > It's QEMU's problem ("interrupt moderation timer is disabled by default")
 >> > 
 >> > and I'm not sure if it's worth to put workaround for qemu quirk
 >> > in re(4) driver. (because wm(4) on qemu works)
 >> If people keep tripping on it, if nothing else it makes us look bad.
 >> Is there a way to get qemu installs to default to wm(4)?
 > Problem also affects when running as HVM domU under XenServer where it is 
 > not 
 > possible to change from re(4).
 There is a workaround for XenServer to enable switching to wm(4):
 However, this does require patching vendor-provided files in all your 
 dom0s that the VM may run on (could be a significant number in a XenServer 
 pool) and the files may be replaced without warning when applying a 

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