Date: Sun, 17 Apr 2005 18:50:12 +0100 (BST) From: Robert Watson <rwatson@FreeBSD.org> To: performance@FreeBSD.org Subject: Re: Memory allocation performance/statistics patches Message-ID: <20050417184726.V91149@fledge.watson.org> In-Reply-To: <20050417134448.L85588@fledge.watson.org> References: <20050417134448.L85588@fledge.watson.org>
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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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