From owner-freebsd-performance@FreeBSD.ORG Sun Apr 17 17:49:15 2005 Return-Path: Delivered-To: freebsd-performance@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 9E7C016A4CE for ; Sun, 17 Apr 2005 17:49:15 +0000 (GMT) Received: from cyrus.watson.org (cyrus.watson.org [204.156.12.53]) by mx1.FreeBSD.org (Postfix) with ESMTP id 435A243D5D for ; Sun, 17 Apr 2005 17:49:15 +0000 (GMT) (envelope-from rwatson@FreeBSD.org) Received: from fledge.watson.org (fledge.watson.org [204.156.12.50]) by cyrus.watson.org (Postfix) with ESMTP id EB7D246B8A for ; Sun, 17 Apr 2005 13:49:14 -0400 (EDT) Date: Sun, 17 Apr 2005 18:50:12 +0100 (BST) From: Robert Watson X-X-Sender: robert@fledge.watson.org To: performance@FreeBSD.org In-Reply-To: <20050417134448.L85588@fledge.watson.org> Message-ID: <20050417184726.V91149@fledge.watson.org> References: <20050417134448.L85588@fledge.watson.org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Subject: Re: Memory allocation performance/statistics patches X-BeenThere: freebsd-performance@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Performance/tuning List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 17 Apr 2005 17:49:15 -0000 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