Messages in this thread | | | From | Roland Dreier <> | Subject | Re: [v2.6.26] what's brewing in x86.git for v2.6.26 | Date | Wed, 16 Apr 2008 13:37:30 -0700 |
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> - 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
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