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Re: [Xen-devel] Xen 4.3 development update

On 03/04/13 09:37, Christoph Egger wrote:
On 02.04.13 19:06, Suravee Suthikulpanit wrote:
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>
* 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 there any tools or good ways to count the number of VMexit in Xen?
xentrace -e 0x8f000 > xentrace.out
[Hit ^C to abort]
xentrace_format formats < xentrace.out > xentrace.dump

You need to manually install 'formats' from tools/xentrace/formats
to a proper place.

Even better is to use xenalyze "summary" mode:


Build, then run:

xenalyze --svm-mode -s [trace file] > summary


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