Re: [RFC] block layer support for DMA IOMMU bypass mode II

From: David S. Miller (davem@redhat.com)
Date: Tue Jul 08 2003 - 17:23:14 EST


   From: Grant Grundler <grundler@parisc-linux.org>
   Date: Tue, 8 Jul 2003 16:25:45 -0600

   On Tue, Jul 08, 2003 at 03:04:33PM -0700, David S. Miller wrote:
> Do you know a common PCI block device that would benefit from this
> (performs significantly better with short sg lists)? It would be
> interesting to test.
>
> %10 to %15 on sym53c8xx devices found on sparc64 boxes.
   
   Which workload?

dbench type stuff, but that's a hard thing to test these days with
the block I/O schedulers changing so much. Try to keep that part
constant in the with/vs/without VIO_VMERGE!=0 testing :)

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