On 01/27/2011 09:10 AM, Matthias Bolte wrote: > 2011/1/27 Justin Clift <jcl...@redhat.com>: >> +Some hypervisors require a larger granularity than kilobytes, rounding down >> +or rejecting requests that are not an even multiple of the desired amount. >> +vSphere/ESX is one of these, requiring the parameter to be evenly divisible >> +by 4MB. For example with vSphere/ESX, 262144 (256MB) is valid as it's a >> +multiple of 4MB; 263168 (257MB) is not valid as it's not a multiple of 4MB; >> +266240 (260MB) is also valid, as it's a multiple of 4MB.
Do we need three examples, or would two be sufficient? For example, vSphere/ESX has a 4MB granularity, so 263168 (257MB) would be rejected while 266240 (260MB) is valid. > Well, currently this is true. But I'm preparing a patch that makes > libvirt round memory/storage request up instead of down when dividing > it for a larger granularity. That way you'll get at least what you > requested. Let's go ahead and push it as-is, since it is accurate for the current state of the tree, > > When my patch gets accepted your patch needs some small tweaks :) then update it as part of the improved semantics. -- Eric Blake ebl...@redhat.com +1-801-349-2682 Libvirt virtualization library http://libvirt.org
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