Message-ID: <3FB66C9F.8070008@gmx.de>
Date: Sat, 15 Nov 2003 19:12:47 +0100
From: "Prakash K. Cheemplavam" <prakashpublic@gmx.de>
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To: Marcus Hartig <marcus@marcush.de>, linux-kernel@vger.kernel.org
Subject: Re: 2.6.0-test9 /-mm3 SATA siimage - bad disk performance
References: <3FB5B74E.5080707@marcush.de> <3FB5EDC1.8010805@gmx.de> <3FB6685A.8010607@marcush.de>
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Marcus Hartig wrote:
> Prakash K. Cheemplavam wrote:
> 
>> I have a similar problem: With 2.4.22-ac3 I had 37mb/sec with my 
>> Samsung HD and 49MB/sec with IBM/Hitachi, now with 2.6 (all I tried, 
>> including test9-mm2) I had only 20mb/sec for Samsung and about 
>> 39mb/sec for the IBM. Motherboard is Abit NF7-S Rev2.0, as well, so 
>> same situation with the siimage 1.06 driver. I wanted to run some dd 
>> tests as well, but it is a real performance hit. Playing with 
>> readahead or other hdparm options didn't help either.
> 
> 
> I get a tip from Mark Hahn to set the pci latency to 64. And wow, with 
> fedora 2.4.22 kernel I get then 41MB/sec with max_k_p_r 128. But,... 
> after copying big files I get ext3-fs erros, cannot read inode etc and a
> bus error. Bumm!

Is there a way to change the latency within Linux? I mean I don't want 
to ruin my Windows, as it works w/o problems. Nevertheless I rather make 
a backup of my Linux install before messing with that...

Prakash

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