linux-kernel - RE: [PATCH V2 RESEND] fsl-sata: I/O load balancing

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Date:	Fri, 17 Feb 2012 03:30:36 +0000
From:	Liu Qiang-B32616 <B32616@...escale.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
CC:	"jgarzik@...ox.com" <jgarzik@...ox.com>,
	"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH V2 RESEND] fsl-sata: I/O load balancing

> -----Original Message-----
> From: Benjamin Herrenschmidt [mailto:benh@...nel.crashing.org]
> Sent: Friday, February 17, 2012 11:18 AM
> To: Liu Qiang-B32616
> Cc: jgarzik@...ox.com; linux-ide@...r.kernel.org; linuxppc-
> dev@...ts.ozlabs.org; linux-kernel@...r.kernel.org
> Subject: RE: [PATCH V2 RESEND] fsl-sata: I/O load balancing
> 
> On Fri, 2012-02-17 at 01:54 +0000, Liu Qiang-B32616 wrote:
> > The default will be set in a common interface
> > fsl_sata_set_irq_coalescing when initialize the controller. This
> > interface will check the range of intr count and ticks and make sure
> the values are reasonably.
> 
> Allright, but the current defaults are basically no coalescing right ?
> 
> > It's hard to find a aggressive value to adapt all scenarios, so I use
> > echo to adjust the value. I remember P5020 have some performance issue,
> I will check it.
> > BTW, which filesystem do you use? Ext2 is lower than ext4 because
> > metadata is continuously wrote to disk. You can try ext4 or xfs.
> 
> ext3 at the moment, I plan to switch to ext4 when I finish that fsck pass
> which is taking hours... I am not aware of the 5020 performance issues,
> is this something documented and/or fixable ?
> 

My patch may not meet your requirement:(
For your performance requirement, I suggest use ext4 filesystem and SSD.

Thanks.

> Cheers,
> Ben.
> 
>