Re: [Xen-users] cpu leveling on opensource xen on sles

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Thu, 2012-07-12 at 12:34 -0400, James Pifer wrote:
> We currently run xen on sles11sp1 and sles11sp2. Our hardware is HP
> Compaq DL360's. We originally started with G6's, but now we've grown and
> have G7's and G8's in the mix. 
> 
> We don't do a lot of live migrations but is convenient to be able to at
> times. Is there any type of cpu leveling that can be done so live
> migrations will work with servers with different processors?

I've no idea what version of Xen is contained in SLES11SP2 but Xen has
long supported levelling at both boot time and per-guest.

Unfortunately the boot time options in
http://xenbits.xen.org/docs/unstable/misc/xen-command-line.html (search
for cpuid) seem to be undocumented. Google might help. If youfigure it
out and are motivated to do so then a patch against
xen-unstable.hg:docs/misc/xen-command-line.markdown would be very much
appreciated ;-)

For per-guest both xm and xl (xl in 4.2/unstable only) support "cpuid
= ...." to level things. The xl syntax is documented in
http://xenbits.xen.org/docs/unstable/man/xl.cfg.5.html (search for
cpuid). It is backwards compatible with the xm/xend syntax which is
therefore also briefly described in there. Unfortunately the xm syntax
is pretty opaque. Again, google is your friend ;-)

Ian.

> 
> Thanks,
> James
> 
> 
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> http://lists.xen.org/xen-users



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