Messages in this thread | | | Subject | Re: [RFC] scheduler: improve SMP fairness in CFS | From | "Li, Tong N" <> | Date | Mon, 23 Jul 2007 14:10:15 -0700 |
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I benchmarked an early version of this code (against 2.6.21) with SPECjbb, SPEComp, kernbench, etc. on an 8-processor system, and didn't see any slowdown compared to the stock scheduler. I'll generate the data again with this version of the code. On the other hand, if locking does become a problem for certain systems/workloads, increasing sysctl_base_round_slice can reduce the locking frequency and alleviate the problem, at the cost of being relatively less fair across the CPUs.
tong
On Mon, 2007-07-23 at 22:00 +0200, Andi Kleen wrote: > Tong Li <tong.n.li@intel.com> writes: > > + > > + read_lock_irqsave(&dwrr_highest_lock, flags); > > That lock looks like it would bounce between CPUs like crazy. > Did you try any benchmarks on a larger system? > > -Andi - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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