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: <563AC2ED.8020205@oracle.com>
Date:	Thu, 05 Nov 2015 10:46:05 +0800
From:	Bob Liu <bob.liu@...cle.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...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 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

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