* Highmem SCSI driver
@ 2003-11-06 16:05 Mark Mokryn
2003-11-06 17:01 ` Arjan van de Ven
0 siblings, 1 reply; 2+ messages in thread
From: Mark Mokryn @ 2003-11-06 16:05 UTC (permalink / raw)
To: linux-scsi, linux-kernel, linux-mm
We are trying to test 64-bit PCI DMA for a SCSI driver on a Xeon box,
RH9 2.4.20-8 bigmem kernel, 6GB RAM.
The machine shows 6GB in top, we set highmem_io in the driver, PCI DMA
mask covers 64-bit range, etc.
Of course we're trying to make sure that the system does not create
bounce buffers unnecessarily. On a 64-bit box (AMD64) everything works
as expected. On the Xeon, no matter what we try, we never see I/Os
mapped above 4GB.
Any ideas on how we can drive I/Os mapped above 4GB down to our driver?
Thanks,
-Mark
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Highmem SCSI driver
2003-11-06 16:05 Highmem SCSI driver Mark Mokryn
@ 2003-11-06 17:01 ` Arjan van de Ven
0 siblings, 0 replies; 2+ messages in thread
From: Arjan van de Ven @ 2003-11-06 17:01 UTC (permalink / raw)
To: Mark Mokryn; +Cc: linux-scsi, linux-kernel, linux-mm
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On Thu, 2003-11-06 at 17:05, Mark Mokryn wrote:
> We are trying to test 64-bit PCI DMA for a SCSI driver on a Xeon box,
> RH9 2.4.20-8 bigmem kernel, 6GB RAM.
> The machine shows 6GB in top, we set highmem_io in the driver, PCI DMA
> mask covers 64-bit range, etc.
can you give an URL to the driver so that we can see why it breaks ?
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2003-11-06 16:05 Highmem SCSI driver Mark Mokryn
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