Messages in this thread |  | | | Date | Sat, 08 Dec 2007 03:56:35 +0530 | | From | Balbir Singh <> | | Subject | Re: [PATCH] Fake NUMA emulation for PowerPC |
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Nathan Lynch wrote: > Hi Balbir- > > Balbir Singh wrote: >> >> Here's a dumb simple implementation of fake NUMA nodes for PowerPC. Fake >> NUMA nodes can be specified using the following command line option >> >> numa=fake=<node range> >> >> node range is of the format <range1>,<range2>,...<rangeN> >> >> Each of the rangeX parameters is passed using memparse(). I find the patch >> useful for fake NUMA emulation on my simple PowerPC machine. I've tested it >> on a non-numa box with the following arguments >> >> numa=fake=1G >> numa=fake=1G,2G >> name=fake=1G,512M,2G >> numa=fake=1500M,2800M mem=3500M >> numa=fake=1G mem=512M >> numa=fake=1G mem=1G > > So this doesn't appear to allow one to assign cpus to fake nodes? Do > all cpus just get assigned to node 0 with numa=fake? >
Yes, they all appear on node 0. We could have tweaks to distribute CPU's as well.
> A different approach that occurs to me is to use kexec with a doctored > device tree (i.e. with the ibm,associativity properties modified to > reflect your desired topology). Perhaps a little bit obscure, but it > seems more flexible. >
That would be interesting, but it always means that we need to run kexec, which might involve two boots.
-- Warm Regards, Balbir Singh Linux Technology Center IBM, ISTL
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