From: Grant Grundler <grundler@parisc-linux.org>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Pavel Machek <pavel@suse.cz>, Greg KH <greg@kroah.com>,
Amit Gud <gud@eth.net>, Alan Stern <stern@rowland.harvard.edu>,
Linux Kernel list <linux-kernel@vger.kernel.org>,
linux-pci@atrey.karlin.mff.cuni.cz, Andrew Morton <akpm@osdl.org>,
Jeff Garzik <jgarzik@pobox.com>,
cramerj@intel.com,
USB development list <linux-usb-devel@lists.sourceforge.net>
Subject: Re: [PATCH] PCI: Add pci shutdown ability
Date: Tue, 26 Apr 2005 10:12:59 -0600 [thread overview]
Message-ID: <20050426161259.GC2612@colo.lackof.org> (raw)
In-Reply-To: <1114489812.7111.42.camel@gaston>
On Tue, Apr 26, 2005 at 02:30:12PM +1000, Benjamin Herrenschmidt wrote:
> Additionally, some machines won't properly park/flush the disk, it's
> necessary to send the proper suspend commands to IDE hard disks prior to
> shutting down or we risk data loss.
That sounds like the disk is caching write data.
SCSI has a "Write Cache Enable" bit in the "caching mode page".
See "scsiinfo -c" output.
10 years ago I measured/compared performance of disabling WCE
(plus queue depth of 8) and enabling WCE (queue depth 1).
It's a wash for the workloads I was testing. I was told "stupid OSs"
that didn't know about tagged queueing needed WCE for benchmarks.
HP cared for exactly the same reasons: Bus Resets or Disk power failure
would cause data loss with WCE enabled.
Disabling WCE on current OSs would solve the above problem
IFF IDE/SATA also supports "cache mode" page.
grant
next prev parent reply other threads:[~2005-04-26 16:11 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <Pine.LNX.4.44L0.0504251128070.5751-100000@iolanthe.rowland.org>
[not found] ` <SVLXCHCON1syWVLEFN00000099e@SVLXCHCON1.enterprise.veritas.com>
[not found] ` <20050425182951.GA23209@kroah.com>
[not found] ` <20050425185113.GC23209@kroah.com>
2005-04-25 19:06 ` [PATCH] PCI: Add pci shutdown ability Greg KH
2005-04-25 19:23 ` Jeff Garzik
2005-04-25 20:07 ` Greg KH
2005-04-25 20:11 ` Adam Belay
2005-04-25 20:11 ` Adam Belay
2005-04-25 19:45 ` Alexander Nyberg
2005-04-25 20:12 ` Greg KH
2005-04-26 3:59 ` Benjamin Herrenschmidt
2005-04-25 20:14 ` Alan Stern
2005-04-25 20:52 ` Alexander Nyberg
2005-04-25 21:12 ` Alan Stern
2005-04-26 15:49 ` Grant Grundler
2005-04-26 16:04 ` Alan Stern
2005-04-26 16:37 ` Grant Grundler
2005-04-26 17:14 ` Alan Stern
2005-04-26 17:41 ` Grant Grundler
2005-05-11 5:33 ` Vivek Goyal
2005-05-11 14:38 ` Alan Stern
2005-04-25 21:58 ` Andrew Morton
2005-04-25 22:13 ` Dave Jones
2005-04-25 23:23 ` Adam Belay
2005-04-26 4:32 ` Benjamin Herrenschmidt
2005-04-26 6:23 ` Adam Belay
2005-04-26 6:23 ` Adam Belay
2005-04-26 7:14 ` Nigel Cunningham
2005-04-26 7:14 ` [linux-pm] " Nigel Cunningham
2005-04-26 9:16 ` Pavel Machek
2005-04-26 9:16 ` Pavel Machek
2005-04-26 9:41 ` Pavel Machek
2005-04-26 3:52 ` Benjamin Herrenschmidt
2005-04-26 15:14 ` Alan Stern
2005-04-26 9:39 ` Pavel Machek
2005-04-26 17:50 ` Dave Jones
2005-04-26 20:23 ` Pavel Machek
2005-04-26 3:45 ` Benjamin Herrenschmidt
2005-04-26 15:11 ` Alan Stern
2005-04-26 16:01 ` Alexander Nyberg
2005-04-26 15:41 ` Grant Grundler
2005-04-26 16:07 ` Richard B. Johnson
2005-04-26 16:19 ` Grant Grundler
2005-04-26 17:12 ` Alan Stern
2005-04-26 17:19 ` Lee Revell
2005-04-25 20:08 ` Adam Belay
2005-04-25 20:08 ` Adam Belay
2005-04-25 20:19 ` Greg KH
2005-04-25 20:19 ` Greg KH
2005-04-25 20:24 ` Adam Belay
2005-04-25 20:24 ` Adam Belay
2005-04-25 20:42 ` Pavel Machek
2005-04-25 20:55 ` Adam Belay
2005-04-25 21:06 ` Pavel Machek
2005-04-26 4:30 ` Benjamin Herrenschmidt
2005-04-26 16:12 ` Grant Grundler [this message]
2005-04-26 13:44 ` [linux-usb-devel] " David Brownell
2005-04-26 21:15 ` Pavel Machek
2005-04-25 21:00 ` Greg KH
2005-04-25 21:13 ` Pavel Machek
2005-04-26 3:41 ` Benjamin Herrenschmidt
2005-04-26 10:11 ` Pavel Machek
2005-04-25 21:13 ` [linux-usb-devel] " David Brownell
2005-04-26 3:39 ` Benjamin Herrenschmidt
2005-04-26 6:33 ` Adam Belay
2005-04-26 6:44 ` Greg KH
2005-05-04 7:02 [PATCH] PCI: fix up word-aligned 16-bit PCI config access through sysfs Greg KH
2005-05-04 7:02 ` [PATCH] PCI: Add pci shutdown ability Greg KH
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