lkml.org 
[lkml]   [2003]   [Nov]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectHighmem SCSI driver
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

-
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/

\
 
 \ /
  Last update: 2005-03-22 13:58    [W:2.008 / U:0.640 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site