[Xen-users] Xen and MMX trouble on Pentium III

[joe average <xen.users@xxxxxxxxxxxxxx>]

Hi!

Is there a known problem with Xen 2.0.6 and MMX on Pentium III?

I have a program with an optimized routine that uses MMX instructions. 
This program's self test failed 3 out of 4 times when it was running 
under a Xen domain 0 kernel (2.6.11.10).
The code is known to work and i'm quite sure it's not a hardware problem 
as it works fine if i reboot and run it in Linux without the hypervisor.
I saw someone had a problem with FPU a couple of months ago but i 
believe his problems disappeared when he switched from 2.0.5 to 2.0.6.
(If i recall correctly, this guy also had a p3 500mhz cpu).

Could this be a similar issue where SIMD regs aren't saved/restored 
properly?
  -- j


/proc/cpuinfo:
vendor_id       : GenuineIntel
cpu family      : 6
model           : 7
model name      : Pentium III (Katmai)
stepping        : 2
cpu MHz         : 495.127
cache size      : 512 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 2
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca 
cmov pat pse36 mmx fxsr sse
Software:
Xen 2.0.6
Linux 2.6.11.10 domain 0 kernel
gcc version 3.3.5-20050130 (Gentoo Linux 3.3.5.20050130-r1, 
ssp-3.3.5.20050130-1, pie-8.7.7.1)
glibc-2.3.4.20041102-r1 without NTPL / TLS

Sources for the above Xen stuff was obtained from installing stuff from 
the tarball on http://bugs.gentoo.org/show_bug.cgi?id=70161
_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users