Re: Memory allocation performance/statistics patches

From: Robert Watson (rwatson_at_FreeBSD.org)
Date: 04/17/05

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    Date: Sun, 17 Apr 2005 18:50:12 +0100 (BST)
To: performance@FreeBSD.org

    On Sun, 17 Apr 2005, Robert Watson wrote:

    > I'd like to confirm that for the first two patches, for interesting
    > workloads, performance generally improves, and that stability doesn't
    > degrade. For the third partch, I'd like to quantify the cost of the
    > changes for interesting workloads, and likewise confirm no loss of
    > stability.

    Just an FYI on some earlier testing done by a couple of people:

    - Bosko Milekic has reported that the UMA changes resulted in a
       performance increase in his high bandwidth denial of service testing,
       as well as a decreased occurence of livelock.

    - Scott Long has reported that the UMA changes produced a performance
       increase in MySQL testing. However, that the combined malloc + mbuf +
       uma patches produced a slight decrease in performance. He has not yet
       been able to try them split out to see if there's another factor at
       work, or which elements are causing the problem.

    - I've observed clear micro-benchmark improvements with the UMA cache in
       place for high speed UDP packet generation in userland, as well as
       syscall tests for the allocation/free of pipes and sockets.

    Robert N M Watson
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