From: Tejun Heo <htejun@gmail.com>
To: kenneth johansson <ken@kenjo.org>
Cc: linux-ide@vger.kernel.org
Subject: Re: ahci problems with sata disk.
Date: Mon, 15 Jan 2007 18:13:22 +0900 [thread overview]
Message-ID: <45AB45B2.2080602@gmail.com> (raw)
In-Reply-To: <1168785128.7865.13.camel@duo>
kenneth johansson wrote:
> I changed my bios setting for SATA from IDE to AHCI.
>
> This resulted in some "interesting" read throughput.
>
> plots can be found at http://kenjo.org/~ken/sata/
> The plots was done on a live disk so some noise is expected but in the
> ahci mode the throughput get stuck at 17 MB way to much.
It's probably not an ahci problem but more of NCQ implementation problem
in the drive firmware. Please report the result of 'hdparm -I /dev/sdX'
and try adjust queue depth and see what happens.
http://linux-ata.org/faq.html
--
tejun
next prev parent reply other threads:[~2007-01-15 9:13 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-14 14:32 ahci problems with sata disk kenneth johansson
2007-01-15 9:13 ` Tejun Heo [this message]
2007-01-15 11:05 ` kenneth johansson
2007-01-15 11:36 ` Alan
2007-01-15 13:50 ` Tejun Heo
2007-01-16 1:43 ` kenneth johansson
2007-01-16 16:44 ` Andrew Lyon
2007-01-16 18:32 ` Mark Lord
2007-01-16 20:20 ` Mark Hahn
2007-01-16 22:10 ` Jeff Garzik
2007-01-16 22:26 ` Eric D. Mudama
2007-01-17 22:03 ` Jens Axboe
2007-01-17 22:03 ` Jens Axboe
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