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To: David.Ronis@mcgill.ca
Cc: David Ronis <ronis@ronispc.chem.mcgill.ca>, david.ronis@mcgill.ca,
       linux-kernel@vger.kernel.org
Subject: RE: problem with 2.6.13.[0-2]
Date: Thu, 29 Sep 2005 04:13:23 +0000
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> 
> In 2.6.13.2:
> 
> /dev/hda:
>  Timing cached reads:    28 MB in  2.15 seconds =  13.03 MB/sec
>  Timing buffered disk reads:   14 MB in  3.30 seconds =   4.24 MB/sec
> 
> and after hdparm -m 16 /dev/hda (recall this is the default in 2.6.12.6)
> 
> /dev/hda:
>  Timing cached reads:    24 MB in  2.05 seconds =  11.73 MB/sec
>  Timing buffered disk reads:   36 MB in  3.11 seconds =  11.56 MB/sec
> 
> I ran thing a few times in each case and the results were close.  There
> was nothing in dmesg.
> 
> David
> 

Hey  that 4.24 MB/sec hints at DMA being busted although it claims to be on. Can you post the complete dmesg output for both kernels please?

Parag