linux-kernel - Re: High CPU usage with sata

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Message-id: <45DBBFE8.5080901@shaw.ca>
Date:	Tue, 20 Feb 2007 21:43:36 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	Matthew Fredrickson <creslin@...ium.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Cc:	Tejun Heo <htejun@...il.com>
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.

What kernel are you using? There were some complaints about latency 
problems (the ATA status register read taking a ridiculous amount of 
time to complete) on sata_nv previously, but 2.6.20 should eliminate 
that problem at least on nForce4 chipsets..

-- 
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@...pamshaw.ca
Home Page: http://www.roberthancock.com/

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