RE: [Xen-devel] [PATCH] per-cpu time changes

Puthiyaparambil, Aravindh
Sat, 09 Jul 2005 14:11:10 -0000

Keir,

I would be interested in the interim patch.

Thanks,
Aravindh

> -----Original Message-----
> From: xen-devel-bounces@lists.xensource.com [mailto:xen-devel-
> bounces@lists.xensource.com] On Behalf Of Keir Fraser
> Sent: Saturday, July 09, 2005 5:40 AM
> To: Don Fry
> Cc: xen-devel@lists.xensource.com
> Subject: Re: [Xen-devel] [PATCH] per-cpu time changes
>
>
> On 8 Jul 2005, at 23:47, Don Fry wrote:
>
> > Here is another set of patches for the per-cpu timer changes to xen
and
> > linux.  The patch is against today''s xen-unstable-src.tgz.
This
fixes
> > the occasional panic I was seeing on booting a slower system, and
the
> > constant panic booting a fast system.  It has been tested UP and SMP
on
> > an IBM summit system, and an IntelliStation.  The ''time went
backwards''
> > messages are no longer seen.
>
> Great! I''m cooking up a time patch to check in over the next few
days
> -- it should handle the one remaining problem I see with your patch,
> that although ''guest time'' will be monotonic on each
individual cpu,
> they will diverge over time because percpu_ticks does not update local
> time w.r.t. a shared timebase. I think solving that necessarily means
> some bigger changes to how time is handled in Xen, and the interface
to
> guests, and I''m currently merging those changes into the xenlinux
tree
> (the Xen side is done and I can post an interim patch if that''s
> interesting for anyone).
>
>   -- Keir
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel

_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com