* CDROM and harddisk fighting over DMA
@ 2001-03-20 9:28 Wouter Verhelst
2001-03-21 0:52 ` Shawn Starr
0 siblings, 1 reply; 2+ messages in thread
From: Wouter Verhelst @ 2001-03-20 9:28 UTC (permalink / raw
To: linux-kernel
(I'm not subscribed to linux-kernel, so please CC any answers. TIA)
Hello
Since I bought my new harddisk (a Maxtor 40GB of about a half year old
now), I've had errors over my console like this:
hda: timeout waiting for DMA
ide_dmaproc: chipset supported ide_dma_timeout func only: 14
hda: irq timeout: status=0x58 { DriveReady SeekComplete DataRequest }
hda is my harddisk. The CDROM was first connected to hdb, but I changed
that to hdc, trying to get rid of these errors. This did not resolve the
issue.
After playing around a bit, I found out that these errors occur when both
the CDROM and the harddisk are being accessed at the same time (well,
almost; it's not an SMP system ;-). I managed to fix it by disabling DMA
on the harddisk, using hdparm. Disabling DMA on the CDROM, by contrast,
did not resolve the issue.
However, as this slows down my data throughput speed quite drastically,
I'd like to do this differently.
I first posted this to comp.os.linux.setup, but did not get any useful
information. I believe it's not some misconfiguration from my side, so I
sent this here since this mailinglist is listed as relevant mailinglist
for the IDE subsystem; however, if this is the wrong place to ask, please
redirect.
--
wouter dot verhelst at advalvas in belgium
Real men don't take backups.
They put their source on a public FTP-server and let the world mirror it.
-- Linus Torvalds
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: CDROM and harddisk fighting over DMA
2001-03-20 9:28 CDROM and harddisk fighting over DMA Wouter Verhelst
@ 2001-03-21 0:52 ` Shawn Starr
0 siblings, 0 replies; 2+ messages in thread
From: Shawn Starr @ 2001-03-21 0:52 UTC (permalink / raw
To: Wouter Verhelst; +Cc: linux-kernel
Some CDROMS can do this, My old Acer 12x cdrom was fighting with DMA with
my new Fujitsu drive, I disabled the cd-rom and no more DMA errors ;-)
You might also be able to fix this by rearranging the CD-ROM and drives:
move the CD-ROM off the HD's IDE chain and put it separate (if its not
already).
Shawn.
On Tue, 20 Mar 2001, Wouter Verhelst wrote:
> (I'm not subscribed to linux-kernel, so please CC any answers. TIA)
>
> Hello
>
> Since I bought my new harddisk (a Maxtor 40GB of about a half year old
> now), I've had errors over my console like this:
>
> hda: timeout waiting for DMA
> ide_dmaproc: chipset supported ide_dma_timeout func only: 14
> hda: irq timeout: status=0x58 { DriveReady SeekComplete DataRequest }
>
> hda is my harddisk. The CDROM was first connected to hdb, but I changed
> that to hdc, trying to get rid of these errors. This did not resolve the
> issue.
> After playing around a bit, I found out that these errors occur when both
> the CDROM and the harddisk are being accessed at the same time (well,
> almost; it's not an SMP system ;-). I managed to fix it by disabling DMA
> on the harddisk, using hdparm. Disabling DMA on the CDROM, by contrast,
> did not resolve the issue.
>
> However, as this slows down my data throughput speed quite drastically,
> I'd like to do this differently.
>
> I first posted this to comp.os.linux.setup, but did not get any useful
> information. I believe it's not some misconfiguration from my side, so I
> sent this here since this mailinglist is listed as relevant mailinglist
> for the IDE subsystem; however, if this is the wrong place to ask, please
> redirect.
>
> --
> wouter dot verhelst at advalvas in belgium
>
> Real men don't take backups.
> They put their source on a public FTP-server and let the world mirror it.
> -- Linus Torvalds
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.tux.org/lkml/
>
>
^ permalink raw reply [flat|nested] 2+ messages in thread
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