linux-kernel - Re: PATA -- pata_amd on 2.6.19 fails to IDENTIFY my DVD-ROM

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Message-ID: <45932AF1.9040900@gmail.com>
Date:	Thu, 28 Dec 2006 11:24:49 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Rene Herman <rene.herman@...il.com>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org
Subject: Re: PATA -- pata_amd on 2.6.19 fails to IDENTIFY my DVD-ROM

Rene Herman wrote:
> Tejun Heo wrote:
> 
>> Rene Herman wrote:
> 
>>> I just tried the PATA driver for my AMD756 chip. During boot, it hangs
>>> for 3 minutes failing to identify my DVD-ROM (secondary slave) and does
>>> not give me access to it after it timed out.
>>
>> Please give a shot at v2.6.20-rc2 and report what the kernel says.
> 
> This IDENTIFY issue seems already fixed in -rc2. No more pause, and my
> DVD-ROM works fine again.

Great.

> Unfortunately, another issue seems to have
> cropped up. On 2.6.20-rc2, hdparm -t /dev/sda gets me ~ 24 M/s while
> both the old IDE driver and the 2.6.19 PATA driver do ~ 50 M/s
> 
> 2.6.20-rc2-ata:
> 
> # hdparm -t /dev/sda
> 
> /dev/sda:
>  Timing buffered disk reads:   72 MB in  3.03 seconds =  23.75 MB/sec
> 
> 2.6.19-ata:
> 
> # hdparm -t /dev/sda
> 
> /dev/sda:
>  Timing buffered disk reads:  150 MB in  3.00 seconds =  49.94 MB/sec

Everything seems fine in the dmesg.  Performance degradation is probably
some other issue in -rc kernel.  I'm suspecting recently fixed block
layer bug.  If it's still the same in the next -rc, please report.

Thanks.

-- 
tejun
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