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

[David S. Miller]

   From: Grant Grundler <[e-mail]>
   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 :)