Messages in this thread | | | Date | Tue, 14 Dec 2004 12:08:44 -0800 | From | "Martin J. Bligh" <> | Subject | Re: [PATCH 0/3] NUMA boot hash allocation interleaving |
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--On Tuesday, December 14, 2004 20:13:48 +0100 Andi Kleen <ak@suse.de> wrote:
> On Tue, Dec 14, 2004 at 10:59:50AM -0800, Martin J. Bligh wrote: >> > NUMA systems running current Linux kernels suffer from substantial >> > inequities in the amount of memory allocated from each NUMA node >> > during boot. In particular, several large hashes are allocated >> > using alloc_bootmem, and as such are allocated contiguously from >> > a single node each. >> >> Yup, makes a lot of sense to me to stripe these, for the caches that > > I originally was a bit worried about the TLB usage, but it doesn't > seem to be a too big issue (hopefully the benchmarks weren't too > micro though)
Well, as long as we stripe on large page boundaries, it should be fine, I'd think. On PPC64, it'll screw the SLB, but ... tough ;-) We can either turn it off, or only do it on things larger than the segment size, and just round-robin the rest, or allocate from node with most free.
>> didn't Manfred or someone (Andi?) do this before? Or did that never >> get accepted? I know we talked about it a while back. > > I talked about it, but never implemented it. I am not aware of any > other implementation of this before Brent's.
Cool, must have been my imagination ;-)
M.
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