Re: How about realize domainSetBlockIoTune by cgroup?

["hzguanqiang@xxxxxxxxxxxxxxxx" <hzguanqiang@xxxxxxxxxxxxxxxx>]



On 2013-08-28 09:35 , Eric Blake wrote:

On 08/26/2013 10:10 PM, hzguanqiang@xxxxxxxxxxxxxxxx wrote:

> Hello experts,

 

[please configure your mailer to wrap long lines]

 

>

> 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

 

 

 

Well , Eric, Thanks for your answer.  The virDomainSetBlkioParameters  API you said is just to

set the blkio.device_weight, not throttle.iops or throttle.bps just as the virDomainSetBlockIoTune

 API did.

 

Thanks

------------------    
Best regards!
GuanQiang

09:40:56

--
libvir-list mailing list
libvir-list@xxxxxxxxxx
https://www.redhat.com/mailman/listinfo/libvir-list