Re: [Xen-devel] Xen 4.3 development update

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 02.04.13 at 18:34, Tim Deegan <tim@xxxxxxx> 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.

Ah, okay, sorry for mixing this up. But how is this a regression
then?

Jan


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