Re: [PATCH v4 10/10] xen/blkback: make pool of persistent grants and free pages per-queue

Konrad Rzeszutek Wilk
2015-11-05T19:50:22Z

On Thu, Nov 05, 2015 at 10:46:05AM +0800, Bob Liu wrote:
>
> On 11/05/2015 10:43 AM, Konrad Rzeszutek Wilk wrote:
> > On Mon, Nov 02, 2015 at 12:21:46PM +0800, Bob Liu wrote:
> >> Make pool of persistent grants and free pages per-queue/ring instead of
> >> per-device to get better scalability.
> >
> > How much better scalability do we get?
> >
>
> Which already showed in [00/10], I paste them here:
>
> domU(orig) 4 queues 8 queues 16 queues
> iops: 690k 1024k(+30%) 800k 750k
>
>
> After patch 9 and 10:
> domU(orig) 4 queues 8 queues 16 queues
> iops: 690k 1600k(+100%) 1450k 1320k

And if you split it? As in only patch 9?

If you could - please mention in the description that with
4 queues with this patch you get 100% increase in IOPS.

>
> Chart: https://www.dropbox.com/s/agrcy2pbzbsvmwv/iops.png?dl=0