Re: [libvirt] How about realize domainSetBlockIoTune by cgroup?
On 08/26/2013 10:10 PM, hzguanqiang(a)corp.netease.com wrote:
Hello experts,
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It seems that blkiotune of kvm domain is set through qemu now, and We found there are
some throttle shaking problem when using this interface.
As you can do the same thing through blkio cgroup, and this sounds to show better
performance, Can we realize domainSetBlockIoTune by cgroup just like interface
domainSetBlkioParameters ? Or Add a new interface to support setting disk IOtune by blkio
cgroup?
Current libvirt already lets you choose between cgroup blkio vs. qemu io
throttling. Compare:
http://libvirt.org/formatdomain.html#elementsBlockTuning describes
<blkiotune> (implemented via cgroups, on a per-host-block-device basis);
mapped through the virDomainSetBlkioParameters API, or via 'virsh blkiotune'
http://libvirt.org/formatdomain.html#elementsDisks describes <iotune>
under <disk> (implemented via qemu, on a per-guest-disk basis); mapped
through the virDomainSetBlockIoTune API, or via 'virsh blkdeviotune'
(and yes, we're lousy at using consistently named API)
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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