From: Linus Torvalds <torvalds@linux-foundation.org>
To: Stephen Hemminger <shemminger@linux-foundation.org>
Cc: Jeff Garzik <jeff@garzik.org>, Mike Houston <mikeserv@bmts.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Linux 2.6.22-rc2
Date: Mon, 21 May 2007 22:04:26 -0700 (PDT) [thread overview]
Message-ID: <alpine.LFD.0.98.0705212153220.3890@woody.linux-foundation.org> (raw)
In-Reply-To: <20070521214255.3dc36445@freepuppy>
On Mon, 21 May 2007, Stephen Hemminger wrote:
>
> AHCI on this motherboard doesn't seem to use MSI. The problems occur
> even if I boot with nomsi.
Have you tried playing with PCI latency counters etc?
Maybe the SATA/AHCI thing is better at saturating the bus, and the sky2
hardware gets upset if it has overlong DMA access latencies due to some
other controller keeping the bus busy with a long burst access?
I can't really see that being a real problem in this day and age of PCI-X
etc, but it _used_ to be a possible issue a decade ago. Maybe you've found
a case where it matters even on modern hardware? We occasionally used to
set the PCI latency timer to make people happy.
(Not that I'm convinced it even has any semantic meaning on a modern PCI
system..)
Linus
next prev parent reply other threads:[~2007-05-22 5:06 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-19 5:17 Linus Torvalds
2007-05-19 6:54 ` Andrey Borzenkov
2007-05-19 14:28 ` [BUG: 2.6.22-rc2] SLAB doesn't like usb_get_configuration() Indan Zupancic
[not found] ` <6101e8c40705190950jb093d65l611995895a182ec0@mail.gmail.com>
2007-05-19 16:51 ` Fwd: " oliver pinter
2007-05-19 18:20 ` Christoph Lameter
2007-05-19 19:33 ` Greg KH
2007-05-19 22:10 ` Indan Zupancic
2007-05-20 12:57 ` Linux 2.6.22-rc2: make -j makes it unresponsive Rafael J. Wysocki
2007-05-20 13:01 ` Krzysztof Halasa
2007-05-20 13:23 ` Rafael J. Wysocki
2007-05-20 21:05 ` Linux 2.6.22-rc2 Mike Houston
2007-05-21 15:45 ` Stephen Hemminger
2007-05-21 17:10 ` Mike Houston
2007-05-21 17:37 ` Stephen Hemminger
2007-05-22 2:58 ` Mike Houston
2007-05-22 4:31 ` Stephen Hemminger
2007-05-22 4:36 ` Jeff Garzik
2007-05-22 4:42 ` Stephen Hemminger
2007-05-22 5:04 ` Linus Torvalds [this message]
2007-05-22 17:19 ` Stephen Hemminger
2007-05-22 17:54 ` H. Peter Anvin
2007-05-22 22:14 ` Mike Houston
2007-05-23 0:00 ` Linus Torvalds
2007-05-23 0:29 ` Stephen Hemminger
2007-05-23 1:53 ` Linus Torvalds
2007-05-23 14:58 ` Stephen Hemminger
2007-05-23 17:39 ` Mike Houston
2007-05-23 17:46 ` Linus Torvalds
2007-05-23 18:04 ` Stephen Hemminger
2007-05-24 18:26 ` Mike Houston
2007-05-24 22:08 ` sky2/pci issues on Gigabyte Stephen Hemminger
2007-05-24 22:48 ` Linus Torvalds
2007-05-24 23:04 ` Stephen Hemminger
2007-05-25 0:01 ` Mike Houston
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