Re: Memory allocation performance/statistics patches

From: Robert Watson (rwatson_at_FreeBSD.org)
Date: 04/30/05

  • Next message: Arne : "Re: Very low disk performance on 5.x" 
    Date: Fri, 29 Apr 2005 23:12:46 +0100 (BST)
To: performance@FreeBSD.org

    On Mon, 25 Apr 2005, Robert Watson wrote:

    > On Mon, 25 Apr 2005, Robert Watson wrote:
    >
    >> I now have updated versions of these patches, which correct some
    >> inconsistencies in approach (universal use of curcpu now, for example),
    >> remove some debugging code, etc. I've received relatively little
    >> performance feedback on them, and would appreciate it if I could get some.
    >> :-) Especially as to whether these impact disk I/O related workloads,
    >> useful macrobenchmarks, etc. The latest patch is at:
    >>
    >>
    >> http://www.watson.org/~robert/freebsd/netperf/20050425-uma-mbuf-malloc-critical.diff
    >
    > FYI: For those set up to track perforce, you can find the contents of
    > this patch in:
    >
    > //depot/user/rwatson/percpu/...
    >
    > In addition, that branch also contains diagnostic micro-benchmarks in
    > the kernel to measure the cost of various synchronization operations,
    > memory allocation operations, etc, which can be queried using "sysctl
    > test".

    FYI:

    I've now committed the UMA changes from this patch.

    Robert N M Watson
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