Re: [Xen-devel] Xen 4.3 development update

[Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>]

On 4/2/2013 11:34 AM, Tim Deegan wrote:
> At 16:42 +0100 on 02 Apr (1364920927), Jan Beulich wrote:
> > > > > On 02.04.13 at 16:07, George Dunlap <George.Dunlap@xxxxxxxxxxxxx> wrote:
> > > * AMD NPT performance regression after c/s 24770:7f79475d3de7
> > >    owner: ?
> > >    Reference: http://marc.info/?l=xen-devel&m=135075376805215
> > This is supposedly fixed with the RTC changes Tim committed the
> > other day. Suravee, is that correct?
> This is a separate problem.  IIRC the AMD XP perf issue is caused by the
> emulation of LAPIC TPR accesses slowing down with Andres's p2m locking
> patches.  XP doesn't have 'lazy IRQL' or support for CR8, so it takes a
> _lot_ of vmexits for IRQL reads and writes.
Is this only for 32-bit XP? or also 64-bit ?

Suravee
> Tim.


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