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

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Message-ID: <20151105195000.GA3559@x230.dumpdata.com>
Date:	Thu, 5 Nov 2015 14:50:07 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Bob Liu <bob.liu@...cle.com>
Cc:	xen-devel@...ts.xen.org, linux-kernel@...r.kernel.org,
	roger.pau@...rix.com, felipe.franciosi@...rix.com, axboe@...com,
	avanzini.arianna@...il.com, rafal.mielniczuk@...rix.com,
	jonathan.davies@...rix.com, david.vrabel@...rix.com
Subject: Re: [PATCH v4 10/10] xen/blkback: make pool of persistent grants and
 free pages per-queue

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
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