linux-kernel - RE: [PATCH][SDK v1.2] sata: I/O load balancing

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Date:	Fri, 13 Jan 2012 09:57:35 +0000
From:	Liu Qiang-B32616 <B32616@...escale.com>
To:	Li Yang-R58472 <r58472@...escale.com>
CC:	"jgarzik@...ox.com" <jgarzik@...ox.com>,
	"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>
Subject: RE: [PATCH][SDK v1.2] sata: I/O load balancing


________________________________________
> From: linux-ide-owner@...r.kernel.org [linux-ide-owner@...r.kernel.org] on behalf of Li Yang [leoli@...escale.com]
> Sent: Friday, January 13, 2012 3:36 AM
> To: Liu Qiang-B32616
> Cc: jgarzik@...ox.com; linux-ide@...r.kernel.org; linux-kernel@...r.kernel.org; linuxppc-dev@...ts.ozlabs.org; Liu Qiang-B32616
> Subject: Re: [PATCH][SDK v1.2] sata: I/O load balancing

> On Fri, Jan 13, 2012 at 4:25 PM, Qiang Liu <qiang.liu@...escale.com> wrote:
> > From: Qiang Liu <b32616@...escale.com>
> >
> > Reduce interrupt singnals through reset Interrupt Coalescing Control Reg.
> > Increase the threshold value of interrupt and timer will reduce the number
> > of complete interrupt sharply. Improve the system performance effectively.

> There is always a trade off of throughput and latency by using
> interrupt coalescing.  It's not reasonable to assume that the
> throughput is the only factor to be considered and set the coalescing
> threshold and timeout to the max value by default.  Have you carried
> out other benchmark like copying many small files?
No, I didn't test small file. I think this won't affect system load. I can have a test
and describe the result in next patch.

> It will be safer to make the coalescing runtime configurable like the
> sata_mv driver, IMO.
Ok, I will do it like this in next patch.


- Leo
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