[Xen-users] QueryPerformaceCounter and TSC returns bad results with Windows HVM

[James Miller <jimm@xxxxxxxxxxxxxxx>]

Hi everyone,

We have a server with 2 sockets, 4 cores each, running CentOS release 5 
(Final) and Xen 3.0.3. On that server we have 7 Windows 2003 DomUs.  
We've locked each one to a specific core and each has a single CPU HAL. 
We have an application which uses QueryPerformanceCounter.  On very rare 
occasions a call to QPC returns a bad result causing our processes to 
disconnect from the server. 

I've read about some bugs with HPC
http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1291
I've also read something about not using APCI somewhat mitigates this 
issue.
Could someone tell me if this issues is being or has been resolved by 
later versions of Xen?
I have, below, a sample configuration of a Windows HVM DomU as well as 
the output of xm vcpu-list. Please let me know if there is any 
additional information I can provide to help resolve this issue and I 
greatly appreciate all your help.
Sample config
import os, re
arch = os.uname()[4]
if re.search('64', arch):
   arch_libdir = 'lib64'
else:
   arch_libdir = 'lib'
name = 'evalvm01.vm'
kernel = '/usr/lib/xen/boot/hvmloader'
builder='hvm'
boot='c'
memory = 2048
vif = [ 'type=ioemu, vifname=vifevalvm01,  mac=aa:00:ef:39:a0:08 
,bridge=xenbr1' ]
device_model = '/usr/' + arch_libdir + '/xen/bin/qemu-dm'
vnc=1
sdl=0
vcpus = 1
cpus ="1"
vnclisten='0.0.0.0'
vncpasswd='xxxxxxxxxx'
disk = [ 'phy:/dev/vg01/evalvm01,ioemu:hda,w']
acpi=1
vncunused=1
vncdisplay=1

xm vcpu-list
Name                              ID VCPUs   CPU State   Time(s) CPU 
Affinity
Domain-0                           0     0     0   r--  2794806.2 0
Domain-0                           0     1     -   --p       2.0 any cpu
Domain-0                           0     2     -   --p       1.1 any cpu
Domain-0                           0     3     -   --p       1.4 any cpu
Domain-0                           0     4     -   --p       0.9 any cpu
Domain-0                           0     5     -   --p       0.9 any cpu
Domain-0                           0     6     -   --p       0.8 any cpu
Domain-0                           0     7     -   --p       0.9 any cpu
evalvm01.vm                      118     0     1   -b-   27903.4 1
evalvm02.vm                      112     0     2   -b-   10507.8 2
evalvm03.vm                      113     0     3   -b-    2445.3 3
evalvm04.vm                      116     0     4   -b-   79872.1 4
evalvm05.vm                      119     0     5   -b-   38717.1 5
evalvm06.vm                      115     0     6   -b-   98750.3 6
evalvm07.vm                      117     0     7   r--   65222.2 7


Jim


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