On Thursday, March 24, 2005 8:54 am, Jesse Barnes wrote: > On Wednesday, March 23, 2005 10:24 pm, Benjamin Herrenschmidt wrote: > > While experimenting with framebuffer access performances, we noticed a > > very significant improvement in write access to it when not setting > > the "guarded" bit on the MMU mappings. This bit basically says that > > reads and writes won't have side effects (it allows speculation). It > > appears that it also disables write combining. > > Doesn't pgprot_writecombine imply non-guarded, so can't you use it instead? > Either way, you'll probably want to fix fbmem.c as well and turn off > _PAGE_GUARDED?
Nevermind about this bit, I just scrolled a little further into your patch :) Jesse - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/