From: Carlo Wood <carlo@alinoe.com>
To: 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 05:54:51 +0200 [thread overview]
Message-ID: <20070623035451.GA5522@alinoe.com> (raw)
In-Reply-To: <20070622214410.GB6970@alinoe.com>
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);
/* some chips lie about 64bit support */
to 2.6.22-rc5, but it had no effect :*)
I'll await any comments from a kernel developer for now.
Please let me know if you want me to test something.
--
Carlo Wood <carlo@alinoe.com>
next prev parent reply other threads:[~2007-06-23 3:55 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 [this message]
2007-06-23 6:22 ` Tejun Heo
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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