Date: Fri, 7 Jan 2000 18:04:27 -0700 (MST) From: Weyrich Computing Consulting <weyrich@goodnet.com> To: Mohit Aron <aron@cs.rice.edu> Cc: freebsd-net@FreeBSD.ORG Subject: Re: performance of FreeBSD-current as SMP Message-ID: <Pine.GSO.4.05.10001071758540.18649-100000@goodguy.goodnet.com> In-Reply-To: <200001080029.SAA05791@cs.rice.edu>
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To hazard a guess, there is certain overhead in SMP. If your processing mix is able to take advantage of concurrent processing, then you will see a net performance boost, but not the expected doubling (due to the overhead penalty). The question is, does your benchmark allow concurrent processing? If you have a single Network Interface Card, does it act as a non-sharable resource that effectively precludes concurrent processing by two web server processes? Your web server does spawn a new process for each client session, and you are generating multiple client sessions concurrently, right? orville. On Fri, 7 Jan 2000, Mohit Aron wrote: > Date: Fri, 7 Jan 2000 18:29:13 -0600 (CST) > From: Mohit Aron <aron@cs.rice.edu> > To: freebsd-net@FreeBSD.ORG > Subject: performance of FreeBSD-current as SMP > > Hi, > I did some simple throughput tests on a handcoded fast webserver > when FreeBSD-current (snapshot from 3rd January) is/is not configured as an > SMP. Only 1 processor is used. When configured as an SMP, the performance > drops down by about 22%. Does anyone have an idea why this happens ? > > > > - Mohit > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-net" in the body of the message > ------------------------------------------------------------------- Orville R. Weyrich, Jr. Weyrich Computer Consulting mailto:orville@weyrich.com KD7HJV http://www.weyrich.com ------------------------------------------------------------------- Visit our online collection of book reviews: http://www.weyrich.com/book_reviews/ Ask about our world wide web services! ------------------------------------------------------------------- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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