linux-kernel - Re: unresponsiveness on linux desktop during file copy

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Message-ID: <4A0FD045.5070208@gmail.com>
Date:	Sun, 17 May 2009 02:52:21 -0600
From:	Robert Hancock <hancockrwd@...il.com>
To:	Mark Knecht <markknecht@...il.com>
CC:	Satish Eerpini <eerpini@...il.com>, Rik van Riel <riel@...hat.com>,
	Ray Lee <ray-lk@...rabbit.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: unresponsiveness on linux desktop during file copy

Mark Knecht wrote:
> On Fri, May 15, 2009 at 7:38 PM, Satish Eerpini <eerpini@...il.com> wrote:
> <SNIP>
>> yeah I get similar numbers even in the absence of the desktop manager
>> , when I tried to copy from  a virtual console.
>> the stats look something like this :
> <SNIP>
>> 00:1f.2 IDE interface: Intel Corporation 82801GBM/GHM (ICH7 Family)
>> SATA IDE Controller (rev 01)
> <SNIP>
> 
> I googled on "82801GBM/GHM slow" and found a lot to read.
> 
> Is DMA for this drive enabled? It seems that some others didn't have
> it enabled by default, or maybe at all. I didn't real the threads very
> far.
> 
> hdparm -d1 /dev/sda
> 
> I think hdparm works for most SATA drivers. man sata to see the other
> things you can check in terms of configuration.

Switching on DMA manually isn't possible with libata through hdparm 
currently. However, this shouldn't be required with libata.

> 
> Clearly, since you see the same thing in a console with X never having
> been started says it's not a GUI issue.
> 
> Hope this helps,
> Mark

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