linux-kernel - Re: High CPU usage with sata

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Message-ID: <45D0C97C.108@gmail.com>
Date:	Mon, 12 Feb 2007 12:09:32 -0800
From:	Tejun Heo <htejun@...il.com>
To:	Matthew Fredrickson <creslin@...ium.com>
CC:	linux-kernel@...r.kernel.org, ris <ris@...at.net.pl>
Subject: Re: High CPU usage with sata_nv

Matthew Fredrickson wrote:
> I have noticed something that might be related as well.  I am working on 
> a device driver that would have periodic data errors due to 
> exceptionally long interrupt handling latency.  I have come to the point 
> that I suspect that it's the sata_nv driver, and now that we can't do 
> the hdparm -u1 option for sata, it seems to be a bigger problem.

That's mostly off topic.  libata configures DMA if at all possible and 
fallback to PIO only after a lot of serious errors.  Is your drive in 
pio mode?  Or does it happen even when in dma mode?

-- 
tejun
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