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

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

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

Please can you try 2.0-testing

Thanks,
Ian
 
> 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
> 
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> 

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