Re: [Qemu-devel] [RFC]QEMU disk I/O limits

[Zhi Yong Wu]

On Wed, Jun 01, 2011 at 09:32:32AM -0400, Vivek Goyal wrote:
>Date: Wed, 1 Jun 2011 09:32:32 -0400
>From: Vivek Goyal <address@hidden>
>To: Zhi Yong Wu <address@hidden>
>Cc: address@hidden, address@hidden, address@hidden,
>       address@hidden, address@hidden, address@hidden,
>       address@hidden, address@hidden, address@hidden,
>       address@hidden, address@hidden, address@hidden,
>       address@hidden
>Subject: Re: [Qemu-devel] [RFC]QEMU disk I/O limits
>User-Agent: Mutt/1.5.21 (2010-09-15)
>
>On Wed, Jun 01, 2011 at 11:19:58AM +0800, Zhi Yong Wu wrote:
>> On Tue, May 31, 2011 at 03:55:49PM -0400, Vivek Goyal wrote:
>> >Date: Tue, 31 May 2011 15:55:49 -0400
>> >From: Vivek Goyal <address@hidden>
>> >To: Zhi Yong Wu <address@hidden>
>> >Cc: address@hidden, address@hidden, address@hidden,
>> >    address@hidden, address@hidden,
>> >    address@hidden, address@hidden,
>> >    address@hidden, address@hidden, address@hidden,
>> >    address@hidden, address@hidden, address@hidden
>> >Subject: Re: [Qemu-devel] [RFC]QEMU disk I/O limits
>> >User-Agent: Mutt/1.5.21 (2010-09-15)
>> >
>> >On Mon, May 30, 2011 at 01:09:23PM +0800, Zhi Yong Wu wrote:
>> >
>> >[..]
>> >>     3.) How the users enable and play with it
>> >>     QEMU -drive option will be extended so that disk I/O limits can be 
>> >> specified on its command line, such as -drive [iops=xxx,][throughput=xxx] 
>> >> or -drive [iops_rd=xxx,][iops_wr=xxx,][throughput=xxx] etc. When this 
>> >> argument is specified, it means that "disk I/O limits" feature is enabled 
>> >> for this drive disk.
>> >
>> >How does throughput interface look like? is it bytes per second or something
>> >else?
>> Given your suggestion, its form will look like below:
>> 
>> -drive [iops=xxx][,bps=xxx] or -drive 
>> [iops_rd=xxx][,iops_wr=xxx][,bps_rd=xxx][,bps_wr=xxx]
>
>Can one specify both iops and bps rule for the same drive?
Right. They both will together limit runtime I/O rate.

Regards,

Zhiyong Wu
>
>Thanks
>Vivek