Re: [Xen-devel] 2.4.26-xen0 unresolved symbol _mmx_memcpy in USB modules

[Zachary Amsden <zach@xxxxxxxxxx>]

In general, modules for different processors or subarchitectures are not 
cross compatible.  Modules compiled for Athlon will use MMX instructions 
to do fast memcopy, but a kernel compiled for Pentium II does not export 
the _mmx_memcpy symbol for modules to use - not because it's not 
supported, but because it's just not as fast on Pentium II.  You should 
be able to use modules which are a strict ancestor of the current kernel 
architecture without problems - i.e. a 386 module in a Pentium II kernel 
should not cause grief.  YMMV.  I highly recommend using modules 
compiled for the same kernel configuration, however.
Cheers,
Zach

Mark Hurenkamp wrote:

> Hi,
>
> I've been playing with the 2.4.26 and 2.4.27 xen0 kernels, and at some
> point I noticed that I was unable to load the USB modules anymore because
> of an unresolved _mmx_memcpy symbol...A bit of fiddling with my settings showed 
> that when I build all my USB
> modules in the kernel, the problem goes away, or alternately, if I switch
> back from Athlon to Pentium II cpu (which was my original setting).
> So for now I'm using the Pentium II as my CPU selection, but I was just
> wondering if this is a known problem, or if I stumbled across something
> new :-) ?
> Warm regards,
> Mark.
>
>
>
>
>
> -------------------------------------------------------
> SF.Net email is sponsored by Shop4tech.com-Lowest price on Blank Media
> 100pk Sonic DVD-R 4x for only $29 -100pk Sonic DVD+R for only $33
> Save 50% off Retail on Ink & Toner - Free Shipping and Free Gift.
> http://www.shop4tech.com/z/Inkjet_Cartridges/9_108_r285
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxxxx
> https://lists.sourceforge.net/lists/listinfo/xen-devel
>  


-------------------------------------------------------
SF.Net email is sponsored by Shop4tech.com-Lowest price on Blank Media
100pk Sonic DVD-R 4x for only $29 -100pk Sonic DVD+R for only $33
Save 50% off Retail on Ink & Toner - Free Shipping and Free Gift.
http://www.shop4tech.com/z/Inkjet_Cartridges/9_108_r285
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxxxx
https://lists.sourceforge.net/lists/listinfo/xen-devel