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From: Tejun Heo <htejun@gmail.com>
To: Carlo Wood <carlo@alinoe.com>, Jeff Garzik <jeff@garzik.org>,
	Tejun Heo <htejun@gmail.com>, Manoj Kasichainula <manoj@io.com>,
	linux-kernel@vger.kernel.org
Subject: Re: SATA RAID5 speed drop of 100 MB/s
Date: Sat, 23 Jun 2007 15:22:04 +0900	[thread overview]
Message-ID: <467CBC0C.6030001@gmail.com> (raw)
In-Reply-To: <20070623035451.GA5522@alinoe.com>

Carlo Wood wrote:
> For what it's worth... I tried applying
> 
> --- a/drivers/ata/ahci.c
> +++ b/drivers/ata/ahci.c
> @@ -516,6 +516,8 @@ static void ahci_save_initial_config(struct pci_dev *pdev,
>          * reset.  Values without are used for driver operation.
>          */
>         hpriv->saved_cap = cap = readl(mmio + HOST_CAP);
> +       hpriv->saved_cap &= ( (1<<28) | (1<<17) );
> +       hpriv->saved_cap |= (1 << 27);
>         hpriv->saved_port_map = port_map = readl(mmio + HOST_PORTS_IMPL);

Hmmm... That's super-odd.  You win my oddest-of-the-month award.  :-)

I'll think about it a bit.  Please stand by.

-- 
tejun

  reply	other threads:[~2007-06-23  6:22 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-06-20 22:48 SATA Harddisk speed drop of 100 MB/s Carlo Wood
2007-06-20 23:06 ` Jeff Garzik
2007-06-21  3:36   ` Arjan van de Ven
2007-06-22 16:21     ` Carlo Wood
2007-06-22 21:17       ` Henrique de Moraes Holschuh
2007-06-22 21:27         ` Carlo Wood
2007-06-23  1:31           ` Henrique de Moraes Holschuh
2007-06-23  2:59             ` Carlo Wood
2007-06-23 17:29               ` Andrew Morton
2007-06-23 22:21                 ` Jeff Garzik
2007-06-25 15:18               ` Lennart Sorensen
2007-06-25 16:04                 ` Carlo Wood
2007-06-22 21:44   ` SATA RAID5 " Carlo Wood
2007-06-23  3:54     ` Carlo Wood
2007-06-23  6:22       ` Tejun Heo [this message]
2007-06-22 21:48   ` Carlo Wood
2007-06-23  7:03     ` Jeff Garzik
2007-06-23  7:54       ` Tejun Heo
2007-06-23 12:53       ` Carlo Wood
2007-06-23 17:30         ` Bartlomiej Zolnierkiewicz
2007-06-23 22:43         ` Jeff Garzik
2007-06-24 11:58           ` Michael Tokarev
2007-06-24 12:59             ` Dr. David Alan Gilbert
2007-06-24 14:21               ` Justin Piszcz
2007-06-24 15:52                 ` Michael Tokarev
2007-06-24 16:59                   ` Justin Piszcz
2007-06-24 22:07                     ` Carlo Wood
2007-06-24 23:46                       ` Mark Lord
2007-06-25  0:23                       ` Patrick Mau
2007-06-24 15:48               ` Michael Tokarev
2007-07-05 22:12             ` Phillip Susi

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