On Mon, 24 Mar 2008, David Miller wrote: > We should fix the underlying problems. > > I'm hitting issues on 128 cpu Niagara2 boxes, and it's all fundamental > stuff like contention on the per-zone page allocator locks. > > Which is very fixable, without going to larger pages. No its not fixable. You are doing linear optimizations to a slowdown that grows exponentially. Going just one order up for page size reduces the necessary locks and handling of the kernel by 50%. > > powerpc also runs HPC codes. They certainly see the same results > > that we see. > > There are ways to get large pages into the process address space for > compute bound tasks, without suffering the well known negative side > effects of using larger pages for everything. These hacks have limitations. F.e. they do not deal with I/O and require application changes. -- To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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