From owner-freebsd-performance@FreeBSD.ORG Wed Jan 2 11:03:05 2008 Return-Path: Delivered-To: freebsd-performance@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id E42EC16A469 for ; Wed, 2 Jan 2008 11:03:05 +0000 (UTC) (envelope-from ivoras@gmail.com) Received: from rv-out-0910.google.com (rv-out-0910.google.com [209.85.198.184]) by mx1.freebsd.org (Postfix) with ESMTP id B33F513C448 for ; Wed, 2 Jan 2008 11:03:05 +0000 (UTC) (envelope-from ivoras@gmail.com) Received: by rv-out-0910.google.com with SMTP id l15so5684491rvb.43 for ; Wed, 02 Jan 2008 03:03:05 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:sender:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references:x-google-sender-auth; bh=BWA6sodqToBz+kfDdB/LgYMixcb2+dJxLXUSUDwbpXA=; b=PqpQhre93HlibvYv629A30nQ2aW8L6Bz2IqSDZgzgEDsV0PypHj21O/VhkdDkglHa1s6FIre8DnL2ivmYPlaArcB7MYSSyKOa+S83BmWFFoImxg+xBW6RijV6LJhu4nicMiA7rvclwnXPJ23cuPszWQBmoTw3c1K56DCg/j4Vb4= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:sender:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references:x-google-sender-auth; b=f1HWuG39+qGLAdIRlzjqMgZNmpOifv87bG2rWxs1yRfs4RjNSAhx8nF52PuWuU9hXFp1hufdN1AUku+/EOdaVdd4LmBgoanZCV4NgVlcrmHoAuGY/CtIzPodB6K+Tbt/0Snt2HzJZ5RvnVVxw207T2WW3mJDQh9NvK8SkXNZT4I= Received: by 10.141.171.6 with SMTP id y6mr4898616rvo.174.1199270103684; Wed, 02 Jan 2008 02:35:03 -0800 (PST) Received: by 10.141.212.1 with HTTP; Wed, 2 Jan 2008 02:35:03 -0800 (PST) Message-ID: <9bbcef730801020235r634fc67bo1239b9626da13fa2@mail.gmail.com> Date: Wed, 2 Jan 2008 11:35:03 +0100 From: "Ivan Voras" Sender: ivoras@gmail.com To: josh.carroll@gmail.com In-Reply-To: <8cb6106e0801012008q18830aebp906ebfeb3c519e5a@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <20071201205609.GA54238@harmless.hu> <47779AA7.2060801@FreeBSD.org> <20071230132451.GA61295@harmless.hu> <47779EBC.5020900@FreeBSD.org> <20071230134354.GA63555@harmless.hu> <4777A65C.8020406@FreeBSD.org> <20071230141118.GA67574@harmless.hu> <4777AB9C.1010003@FreeBSD.org> <8cb6106e0801012008q18830aebp906ebfeb3c519e5a@mail.gmail.com> X-Google-Sender-Auth: 26576755f5079c28 Cc: freebsd-performance@freebsd.org Subject: Re: mysql scaling questions X-BeenThere: freebsd-performance@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Performance/tuning List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 02 Jan 2008 11:03:06 -0000 On 02/01/2008, Josh Carroll wrote: > > Does anyone have a theory why syscalls are so expensive in FreeBSD? Here > > are the results of unixbench 4.1 on two machines. First is the machine > > running FreeBSD HEAD (debugging disabled) on a dual-core Athlon 64 (i386 > > mode), 2 GHz: > > I ran the syscall benchmark from UnixBench on the same hardware (Intel > Q6600 @ 3.2 GHz) for both FreeBSD 7.0-RC1 (amd64) and Knoppix 5.1 > (Linux 2.6.9 PREEMPT kernel, i386). > > Per the comments in this thread, i386 syscalls should be less > expensive than amd64 syscalls, so the results are interesting: > > FreeBSD 7.0-RC1 (amd64): System Call Overhead > 15000.0 1103233.7 735.5 > Knoppix Linux 2.6.9 (i686): System Call Overhead > 15000.0 1108869.7 739.2 > Doesn't look like the syscalls are slower at all on FreeBSD. Thanks, I'll have to look further to see where the slowdowns are.