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

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Date:	Fri, 17 Feb 2012 03:09:54 +0000
From:	Li Yang-R58472 <r58472@...escale.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Liu Qiang-B32616 <B32616@...escale.com>
CC:	"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
	"jgarzik@...ox.com" <jgarzik@...ox.com>,
	"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

>I tried a debian install on the p5020ds here and I find SATA to be
>extremely slow, generating millions of interrupts. I think the defaults
>should be a lot more aggressive at coalescing.

The P5020 has a hardware problem with SATA, making it generate more interrupts than it should.  A new revision of the silicon will fix it.

- Leo

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