From owner-freebsd-performance@FreeBSD.ORG Thu Dec 13 14:00:25 2007 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 C1F8616A468 for ; Thu, 13 Dec 2007 14:00:25 +0000 (UTC) (envelope-from trashy_bumper@yahoo.com) Received: from web36306.mail.mud.yahoo.com (web36306.mail.mud.yahoo.com [209.191.91.183]) by mx1.freebsd.org (Postfix) with SMTP id 6651C13C4D9 for ; Thu, 13 Dec 2007 14:00:25 +0000 (UTC) (envelope-from trashy_bumper@yahoo.com) Received: (qmail 49732 invoked by uid 60001); 13 Dec 2007 13:33:44 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:MIME-Version:Content-Type:Message-ID; b=fP5IObhMBZt67kFnNpNPWTRoMns7nuHIa8hK1ZbGOr4o0qwJ4a52cHZJhZSIfdZ1NihmsegCYwAQBxCcCbJnbbLFHWHWNZxzrcae9ZGBs/Spz+SrmagU+LOx7QntKT8lvotqOZlO6gvG3QkXdcCsYB/gNh6UPDGYj4x4xY2VVAo=; X-YMail-OSG: BidPoC0VM1lNXzYZHxAw2ih489m7sSio5Y9GDvPIzRN4rn0CbKmce_4RPAztifkKUpGaxMyrM.tNy5Otiq7OZXctUS7mnIxf.DN_2kqPngMMDdtm7R4- Received: from [77.122.205.244] by web36306.mail.mud.yahoo.com via HTTP; Thu, 13 Dec 2007 05:33:43 PST X-Mailer: YahooMailRC/818.31 YahooMailWebService/0.7.158.1 Date: Thu, 13 Dec 2007 05:33:43 -0800 (PST) From: Nash Nipples To: freebsd-performance@freebsd.org MIME-Version: 1.0 Message-ID: <28761.46997.qm@web36306.mail.mud.yahoo.com> Content-Type: text/plain; charset=us-ascii X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Subject: Re: freebsd vs linux: performance problem 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: Thu, 13 Dec 2007 14:00:25 -0000 sounds like a power unit problem. try to switch them and repeat. ----- Original Message ---- From: Shantanu Ghosh To: freebsd-performance@freebsd.org Sent: Thursday, December 13, 2007 2:07:50 PM Subject: freebsd vs linux: performance problem Hi, I am running FreeBSD 7.0 Beta1 and Linux FC6 on two identical pieces of hardware - Dell poweredge with intel core2 duo. Each system has 4 CPUs. Now, in simple memory access operations, I see the freebsd system being noticably slower than the linux system. A simple C program that copies from one memory buffer to another, when executed in a loop executes between 10-30% slower on freebsd, as compared to linux. The assembly code of the program used for testing is identical in both the cases. One observation is that freebsd system performance decreases as the size of the buffer increases. If the buffer is under 1k, both the sytems give the same performance. freebsd performance is about 10% slower if the buffer size is around 4k, and about 30% slower if the buffer is around 1Mb. A benchmark like sysbench memory read operation performs miserably on the freebsd system, compared to linux. As far as I can see, the BIOS settings are identical on both the machines. Any idea what could be going on? Thanks and regards. -- Shantanu. ____________________________________________________________________________________ Never miss a thing. Make Yahoo your home page. http://www.yahoo.com/r/hs _______________________________________________ freebsd-performance@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-performance To unsubscribe, send any mail to "freebsd-performance-unsubscribe@freebsd.org" ____________________________________________________________________________________ Looking for last minute shopping deals? Find them fast with Yahoo! Search. http://tools.search.yahoo.com/newsearch/category.php?category=shopping