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

[Stephen Borrill <netbsd%precedence.co.uk@localhost>]

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

From: Stephen Borrill <netbsd%precedence.co.uk@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: 
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")
 >> > 
 >> http://www.valinux.co.jp/technologylibrary/document/virtualization/kvm_netbsd0001/#n04
 >> > 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):
 
http://discussions.citrix.com/topic/329848-openbsd-with-message-watchdog-timeout/
 
 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 
 hotfix.
 
 -- 
 Stephen