Messages in this thread | | | Subject | Re: pci-sysfs resource mmap broken (and PATCH) | From | Benjamin Herrenschmidt <> | Date | Thu, 28 Apr 2005 17:46:38 +1000 |
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On Thu, 2005-04-28 at 00:22 -0700, David S. Miller wrote: > On Thu, 28 Apr 2005 17:21:19 +1000 > Benjamin Herrenschmidt <benh@kernel.crashing.org> wrote: > > > I have a real net big performance improvement on X by doing that > > trick ... the sysfs mmap API doesn't really provide a mean to do > > it explicitely from userland (unlike the ioctl with the old proc api) > > You can refine your test to "if PCI class is display or VGA" and the > prefetchability is set in the BAR, then elide the guard PTE > protection bit.
Yes, but I was also thinking about some of those Myrinet kind of things who also provide large PCI shared memory region ...
I may end up adding an explicit list of classes/vid/did that are "allowed" to use the trick to avoid problems.
Ben.
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