From: Ryan Mack <lists@mackman.net>
To: Markus Plail <linux-kernel@gitteundmarkus.de>
Cc: linux-kernel@vger.kernel.org
Subject: Re: 2.4.21 ServerWorks DMA Bugs
Date: Sat, 5 Jul 2003 09:58:06 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.53.0307050956060.2029@mackman.net> (raw)
In-Reply-To: <87fzllh21i.fsf@gitteundmarkus.de>
That at least explains the lack of DMA, but why does non-DMA IO result in
such significant clock skew?
Also, does anybody know what the status of the failure to recognize higher
UDMA modes on the CSB5 chipset? Is there a working patch out there?
Thanks again, Ryan
On Sat, 5 Jul 2003, Markus Plail wrote:
> On Fri, 4 Jul 2003, Ryan Mack wrote:
>
> > I've real the other threads but nothing touches on my specific issue.
> > I have a dual P4 Xeon Dell PowerEdge 1600SC with a Fusion MPT SCSI
> > controller and a ServerWorks CSB5 IDE chipset. All the HDs are on the
> > SCSI bus, and only my CD reader and my DVD writer are on the IDE bus
> > (one on each channel). Hyperthreading is enabled (4 logical
> > processors). I am using GCC 3.2.2.
> >
> > The CD readers is the blacklisted 'SAMSUNG CD-ROM SC-148C' and I never
> > use it so I can remove it if needed. The DVD writer is a 'SONY DVD RW
> > DRU-500A'. Both are going through the ide-scsi driver. Whenever I
> > read/write CDs in the DVD writer, I get very high system load (50% on
> > one CPU), even though DMA seems to be enabled.
>
> If you are writing CDs with unusual block sizes (audio CDs, (S)VCDs,
> RAW mode -> blocksize != 2048) you won't get DMA with ide-scsi, no
> matter what you do. It's simply not supported.
next prev parent reply other threads:[~2003-07-05 16:43 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-07-05 6:45 2.4.21 ServerWorks DMA Bugs Ryan Mack
2003-07-05 6:49 ` Andre Hedrick
2003-07-05 7:21 ` Markus Plail
2003-07-05 16:58 ` Ryan Mack [this message]
2003-07-05 17:07 ` Jeff Garzik
2003-07-06 7:40 ` Alan Cox
2003-07-06 9:06 ` Tomas Szepe
2003-07-06 9:10 ` Alan Cox
2003-07-06 11:10 ` Tomas Szepe
2003-07-06 11:38 ` Alan Cox
2003-07-06 16:42 ` Vojtech Pavlik
2003-07-06 17:49 ` Alan Cox
2003-07-07 0:42 ` Andre Hedrick
2003-07-07 3:42 ` Tomas Szepe
2003-07-07 6:42 ` Alan Cox
2003-07-07 8:49 ` Tomas Szepe
2003-07-07 8:13 ` Andre Hedrick
2003-07-07 8:17 ` Andre Hedrick
2003-07-07 8:45 ` Tomas Szepe
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