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



On Tue, Aug 30, 2011 at 4:31 PM, shu ming <shuming linux vnet ibm com> wrote:
> Zhi Yong Wu:
>>
>> On Tue, Aug 30, 2011 at 3:18 PM, shu ming<shuming linux vnet ibm com>
>>  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.
Right

>
>
>



-- 
Regards,

Zhi Yong Wu


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