From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: James Bottomley <James.Bottomley@SteelEye.com>
Cc: Nathan Bryant <nbryant@optonline.net>,
Pavel Machek <pavel@ucw.cz>,
Linux SCSI Reflector <linux-scsi@vger.kernel.org>,
Linux Kernel list <linux-kernel@vger.kernel.org>,
Jeff Garzik <jgarzik@pobox.com>
Subject: Re: [PATCH] SCSI midlayer power management
Date: Fri, 13 Aug 2004 09:02:17 +1000 [thread overview]
Message-ID: <1092351736.26430.12.camel@gaston> (raw)
In-Reply-To: <1092314892.1755.5.camel@mulgrave>
On Thu, 2004-08-12 at 22:48, James Bottomley wrote:
> On Wed, 2004-08-11 at 19:36, Benjamin Herrenschmidt wrote:
> > Some hosts will continuously DMA to memory iirc.. I remember having a
> > problem with 53c8xx on some macs when transitionning from MacOS to Linux
> > because of that.
>
> I think you're thinking of the scripts engine? on pre 53c875 chips,
> yes, this is true. The on-board processor is executing instructions
> from host memory. However, this is read only in quiescent (waiting for
> host connect or target reconnect) mode, so shouldn't be a problem for
> suspend. On the 875 and later, we host the scripts in on-chip memory so
> they shouldn't be troubling main memory when idling.
The problem was a 875, the script was writing some kind of status or
whatever at regular interval to host memory. Might be specific to the
script used by the MacOS driver tho...
Ben.
next prev parent reply other threads:[~2004-08-12 23:09 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-10 23:58 [PATCH] SCSI midlayer power management Nathan Bryant
2004-08-11 8:09 ` Pavel Machek
2004-08-11 13:13 ` Nathan Bryant
2004-08-11 13:37 ` James Bottomley
2004-08-11 15:21 ` Alan Cox
2004-08-11 16:28 ` James Bottomley
2004-08-11 16:43 ` Nathan Bryant
2004-08-11 23:36 ` Benjamin Herrenschmidt
2004-08-12 7:45 ` Pavel Machek
2004-08-12 10:38 ` Benjamin Herrenschmidt
2004-08-12 12:48 ` James Bottomley
2004-08-12 13:14 ` Pavel Machek
2004-08-12 16:29 ` James Bottomley
2004-08-12 19:11 ` Pavel Machek
2004-08-12 19:34 ` James Bottomley
2004-08-12 20:26 ` Pavel Machek
2004-08-12 20:31 ` James Bottomley
2004-08-12 20:37 ` Pavel Machek
2004-08-12 20:42 ` James Bottomley
2004-08-12 20:48 ` Pavel Machek
2004-08-12 20:52 ` Nathan Bryant
2004-08-12 20:40 ` Nathan Bryant
2004-08-12 23:05 ` Benjamin Herrenschmidt
2004-08-12 22:36 ` Nigel Cunningham
2004-08-12 22:43 ` Nigel Cunningham
2004-08-12 23:04 ` Benjamin Herrenschmidt
2004-08-12 13:41 ` Nathan Bryant
2004-08-12 16:45 ` Patrick Mansfield
2004-08-12 23:02 ` Benjamin Herrenschmidt [this message]
2004-08-11 20:19 ` Pavel Machek
2004-08-11 20:50 ` Nathan Bryant
2004-08-11 22:16 ` Nigel Cunningham
2004-08-11 22:48 ` Nathan Bryant
2004-08-12 7:43 ` Pavel Machek
2004-08-12 9:39 ` Nigel Cunningham
2004-08-12 13:43 ` Nathan Bryant
-- strict thread matches above, loose matches on Subject: below --
2004-08-16 13:29 James.Smart
2004-08-10 23:56 Nathan Bryant
2004-08-11 9:53 ` Alan Cox
2004-08-11 12:55 ` Nathan Bryant
2004-08-11 13:39 ` James Bottomley
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