Messages in this thread | | | From | "John Hawkes" <> | Subject | Re: [Lse-tech] [patch] sched-domain cleanups, sched-2.6.5-rc2-mm2-A3 | Date | Thu, 25 Mar 2004 08:19:28 -0800 |
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From: "Nakajima, Jun" <jun.nakajima@intel.com> > We have found some performance regressions (e.g. SPECjbb) with the > scheduler on a large IA-64 NUMA machine, and we are debugging it. On SMP > machines, we haven't seen performance regressions.
I've run a flavor of AIM7 and kernbench on a variety of ia64-NUMA CPU counts, ranging up to 128p (and my 2.6.4 + Piggin-scheduler kernel hangs during boot at >=192p, vs. 2.6.4 + vanilla-scheduler booting and running at 512p), and the Piggin scheduler is 10-15% slower at 64p, and even worse at 128p. I did, however, produce superior performance (superior to the vanilla scheduler) with AIM7 by increasing the sched_domain->busy_factor by 4x. I tried a few other things, but nothing improved performance on these big systems better than a simple increase of busy_factor.
John Hawkes
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