lkml.org 
[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
    From
    Date
    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/

    \
     
     \ /
      Last update: 2007-07-23 23:13    [W:0.040 / U:61.512 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site