On Fri, 4 May 2007, Tim Chen wrote: > On Fri, 2007-05-04 at 11:27 -0700, Christoph Lameter wrote: > > > > > Not sure where to go here. Increasing the per cpu slab size may hold off > > the issue up to a certain cpu cache size. For that we would need to > > identify which slabs create the performance issue. > > > > One easy way to check that this is indeed the case: Enable fake NUMA. You > > will then have separate queues for each processor since they are on > > different "nodes". Create two fake nodes. Run one thread in each node and > > see if this fixes it. > > I tried with fake NUMA (boot with numa=fake=2) and use > > numactl --physcpubind=1 --membind=0 ./netserver > numactl --physcpubind=2 --membind=1 ./netperf -t TCP_STREAM -l 60 -H > 127.0.0.1 -i 5,5 -I 99,5 -- -s 57344 -S 57344 -m 4096 > > to run the tests. The results are about the same as the non-NUMA case, > with slab about 5% better than slub.
Hmmmm... both tests were run in the same context? NUMA has additional overhead in other areas. - 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/