[lkml]   [2007]   [Jul]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [RFC] scheduler: improve SMP fairness in CFS
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.


On Mon, 2007-07-23 at 22:00 +0200, Andi Kleen wrote:
> Tong Li <> 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
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2007-07-23 23:13    [from the cache]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site