On Sat, Jul 15, 2006 at 05:15:00AM +0000, yamt@mwd.biglobe.ne.jp wrote:
> 	after switching one of my machines from xen2 to xen3,
> 	i occasionally (less frequently than once a day) see lwps in domU
> 	stucking in "biowait", "vflushbuf".  (and "vnlock").
> 	i guess in some cases bio requests get stuck or lost?
> 
> 	i haven't successfully checked if it was the whole xbd or just
> 	some requests being stuck.
> 
> 	- it's a single processor machine.
> 	- both of dom0 and domU are netbsd-current.
> 	  (i haven't noticed the problem on linux domU yet,
> 	  but it can be a matter of luck.)
> 	- it used to work fine with xen2.

Hi,
could you try current with these changes:
cvs rdiff -r1.12 -r1.13 src/sys/arch/xen/include/cpufunc.h
cvs rdiff -r1.5 -r1.6 src/sys/arch/xen/include/xen3-public/io/ring.h

It seems to fixe a similar hang in the network interface for me ...

-- 
Manuel Bouyer <bouyer@antioche.eu.org>
     NetBSD: 26 ans d'experience feront toujours la difference
--