From owner-freebsd-geom@FreeBSD.ORG Fri Dec 29 12:55:56 2006 Return-Path: X-Original-To: freebsd-geom@freebsd.org Delivered-To: freebsd-geom@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 294E716A651 for ; Fri, 29 Dec 2006 12:55:56 +0000 (UTC) (envelope-from arne_woerner@yahoo.com) Received: from web30305.mail.mud.yahoo.com (web30305.mail.mud.yahoo.com [209.191.69.67]) by mx1.freebsd.org (Postfix) with SMTP id 844D113C4C2 for ; Fri, 29 Dec 2006 12:55:45 +0000 (UTC) (envelope-from arne_woerner@yahoo.com) Received: (qmail 12937 invoked by uid 60001); 29 Dec 2006 12:55:45 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=Message-ID:X-YMail-OSG:Received:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding; b=i3SnTYMcWWm1ANXiqNeaVISafadQX/vTgH7UwQA9/MMUagGy3hLC2B+/iBYXql3f2OEZo3oTqHKBmudLE9VEUIGEmlA3SN+eSnJ1fTvEq1Je0RNCN+KNb6LI0qRMlx8hfd318avoer7c0mre1TJUmZSsgTyqOLnqOspUeIJ2wsI= ; Message-ID: <20061229125545.12935.qmail@web30305.mail.mud.yahoo.com> X-YMail-OSG: 1.Jx2qMVM1mTzola_PPbxg4eVAsdShJOxu8KtjkiQTOi8Cba9LLYAj0y.WU0tk6IUJoVBRovC.BNmhr5.hTWPPVtSjJFJvg8z9pwDcfy7U5cJm9ml29lVfmFK9sMXKQe8i9.pkrVuFG8vDw- Received: from [85.212.8.201] by web30305.mail.mud.yahoo.com via HTTP; Fri, 29 Dec 2006 04:55:44 PST Date: Fri, 29 Dec 2006 04:55:44 -0800 (PST) From: "R. B. Riddick" To: vd@FreeBSD.org, freebsd-geom@freebsd.org In-Reply-To: <20061229120517.GA12877@qlovarnika.bg.datamax> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit Cc: Subject: Re: gstripe performance scaling with many disks X-BeenThere: freebsd-geom@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: GEOM-specific discussions and implementations List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 29 Dec 2006 12:55:56 -0000 --- Vasil Dimov wrote: > Here is what further tests showed: > > First of all I switched from dd to raidtest. I had to tune raidtest in > order to use it, see ports/107311. I am testing only reading with 8 > concurrent processes (raidtest test -n 8). > Interesting... But the degradation is much less now... Not 25% (or what was it) but just 10%... Did u try a different stripe size (-s 65536) with more concurrency (-n 20), too? -Arne __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com