lkml.org 
[lkml]   [2008]   [Apr]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [v2.6.26] what's brewing in x86.git for v2.6.26
Date
 >  - PAT support - first step towards phasing out MTRR's for cache 
> attribute control

I just grabbed your tree and I see that there is no
pgprot_writecombine() for x86. I see that pci_mmap_page_range() handles
write combining but there's no way for a PCI driver to allow userspace
to mmap() part of a BAR with WC enabled. Doing this gives a big
performance boost for running low-latency apps on InfiniBand hardware
driven by the mlx4 driver (look for the FIXME about it in
drivers/infiniband/hw/mlx4/main.c). Are there any plans to handle this
somehow?

Thanks,
Roland


\
 
 \ /
  Last update: 2008-04-16 22:39    [W:0.186 / U:0.916 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site