Re: [Xen-devel] Xen 4.3 development update

[Tim Deegan <tim@xxxxxxx>]

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.

Tim.

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