Re: [libvirt] The design choice for how to enable block I/O throttling function in libvirt

Zhi Yong Wu: > > On Tue, Aug 30, 2011 at 3:18 PM, shu ming&lt;shuming(a)linux.vnet.ibm.com&gt; >  wrote: >> >> See commens below. >> Zhi Yong Wu: >>> >>> HI, folks, >>> >>> I am trying to enable block I/O throttling function in libvirt. But >>> currently i met some design questions, and don't make sure if we >>> should extend blkiotune to support block I/O throttling or introduce >>> one new libvirt command "blkiothrottle" to cover it or not. If you >>> have some better idea, pls don't hesitate to drop your comments. >>> >>> If one new libvirt command "blkiothrottle" is introduced, I plan to >>> design its usage syntax as below: >>> >>> virsh # help blkiothrottle >>>   NAME >>>     blkiothrottle - Set or display a block disk I/O throttle setting. >>> >>>   SYNOPSIS >>>     blkiothrottle<domain>    <device>    [--bps<number>] [--bps_rd >>> <number>] [--bps_wr<number>] [--iops<number>] [--iops_rd<number>] >>> [--iops_wr<number>] >>> >>>   DESCRIPTION >>>     Set or display a block disk I/O throttle setting. >>> >>>   OPTIONS >>>     [--domain]<string>     domain name, id or uuid >>>     [--device]<string>     block device >>>     --bps<number>      total throughput limits in bytes/s >>>     --bps_rd<number>     read throughput limits in bytes/s >>>     --bps_wr<number>     write throughput limits in bytes/s >>>     --iops<number>     total operation limits in numbers/s >>>     --iops_rd<number>     read operation limits in numbers/s >>>     --iops_wr<number>     write operation limits in numbers/s >>> >> How to display the current I/O throttle setting of a specific block >> device >> here? > > It will show as below: > virtio0: bps=xxx, bps_rd=xxx, bps_wr=xxx, iops=xxx, iops_rd=xxx, > iops_wr=xxx. With which options to the command?  I guess "blkiothrottle <domain> <device>" will display the current setting.