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From: Tejun Heo <htejun@gmail.com>
To: Rene Herman <rene.herman@gmail.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>, linux-kernel@vger.kernel.org
Subject: Re: PATA -- pata_amd on 2.6.19 fails to IDENTIFY my DVD-ROM
Date: Thu, 28 Dec 2006 11:24:49 +0900	[thread overview]
Message-ID: <45932AF1.9040900@gmail.com> (raw)
In-Reply-To: <4592B25A.4040906@gmail.com>

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

  reply	other threads:[~2006-12-28  2:25 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-12-20 13:37 PATA -- pata_amd on 2.6.19 fails to IDENTIFY my DVD-ROM Rene Herman
2006-12-27  7:19 ` Tejun Heo
2006-12-27 17:50   ` Rene Herman
2006-12-28  2:24     ` Tejun Heo [this message]
2007-01-01 22:46       ` 2.6.20-rc2+: CFQ halving disk throughput Rene Herman
2007-01-01 22:56         ` Rene Herman
2007-01-01 23:30           ` Linus Torvalds
2007-01-01 23:28         ` Mark Lord
2007-01-02  8:34           ` Jens Axboe
2007-01-02 15:01             ` Mark Lord
2007-01-02 16:53               ` Tejun Heo
2007-01-02 17:35                 ` Mark Lord
2007-01-02 17:53                   ` Tejun Heo
2007-01-02 18:10                     ` Mark Lord
2007-01-02 21:50                     ` ATA_12 support for libata/ATAPI devices Mark Lord
2007-01-02 17:09               ` 2.6.20-rc2+: CFQ halving disk throughput Jan Engelhardt
2007-01-02  5:36         ` Andrew Morton
2007-01-02  8:44           ` Jens Axboe
2007-01-02 10:24             ` Rene Herman
2007-01-02 11:57               ` Jens Axboe
2007-01-02 12:10                 ` Jens Axboe
2007-01-02 15:12                   ` Mark Lord
2007-01-02 15:14                     ` Jens Axboe
2007-01-02 15:40                       ` Mark Lord
2007-01-02 15:45                         ` Jens Axboe

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