From owner-freebsd-performance@FreeBSD.ORG Wed Mar 26 09:51:33 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 D0D22106564A for ; Wed, 26 Mar 2008 09:51:33 +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 A3AEC8FC2F for ; Wed, 26 Mar 2008 09:51:33 +0000 (UTC) (envelope-from ivoras@gmail.com) Received: by rv-out-0910.google.com with SMTP id g13so2285281rvb.43 for ; Wed, 26 Mar 2008 02:51:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=beta; 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=KoD0eC2FBiLaAFj4a22+Qnv87G13wwPdRNdxAjF5r3E=; b=K0Ckh6L81B3caNvX+ea8vzN3o289NqT/41Wuh2Xij8TA9OSFI0JfJqb9aa9uw1zGkqf7HeF5LEr7xKi2La6y/DTPkD6THOIKVIQCoiCiRl/M9hW7o/2lujoD1Bqc9FRT/QNm4ugX9hGPBbTrm58pasown09z+7wePVpRdaPRXAM= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; 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=Z6V7ThvC48pCnYJuyoQK28304fcVBCddOmeqZl6S74O0r0A9jHo0fww9stgEdTSaoke/d9o9O8+lfxu2kcdZ0atTNKWlR3Ae3HXniopDPV2ad1pGdElMNE/le3+hvHuWFevzPvU4a2hc3z9ej3Ve4T/kg0sI5vk77nyYG3SRw4M= Received: by 10.141.197.8 with SMTP id z8mr4239071rvp.157.1206525092898; Wed, 26 Mar 2008 02:51:32 -0700 (PDT) Received: by 10.141.212.1 with HTTP; Wed, 26 Mar 2008 02:51:32 -0700 (PDT) Message-ID: <9bbcef730803260251g43583da6pff1c291db0cc9246@mail.gmail.com> Date: Wed, 26 Mar 2008 10:51:32 +0100 From: "Ivan Voras" Sender: ivoras@gmail.com To: "Benjeman J. Meekhof" In-Reply-To: <47E9E660.6090101@umich.edu> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <47E85C00.4010601@umich.edu> <47E9E660.6090101@umich.edu> X-Google-Sender-Auth: 58f4d0d2dd91f3c5 Cc: freebsd-performance@freebsd.org Subject: Re: performance tuning on perc6 (LSI) controller 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, 26 Mar 2008 09:51:33 -0000 On 26/03/2008, Benjeman J. Meekhof wrote: > Hi Ivan, > > Thanks for the response. Your response quotes my initial uneven > results, but are you also implying that I most likely cannot achieve > results better than the later results which use a larger filesystem > blocksize? > > gstripe label -v -s 128k test /dev/mfid0 /dev/mfid2 > #newfs -U -b 65536 /dev/stripe/test > #write: 19.240875 secs (558052492 bytes/sec) > #read: 20.000606 secs (536854644 bytes/sec) > > (iozone showed reasonably similar results - depending on recordsize > would mostly be writing/reading around 500MB/s, though lows of 300MB/s > were recorded in some read situations). Yes, that was my meaning. If I understood you correctly, Linux manages ~~ 800 MB/s on the array, right? > I suppose my real question is whether there is some inherent limit in > UFS2 or FreeBSD or geom that would prevent going higher than this. > Maybe that's really not possible to answer, but certainly I plan to > explore a few more configurations. I'd guess it's UFS(2), but I don't really know. My own benchmarking was on a different controller (IBM ServeRAID 8) and I got a similar ratio between Linux and FreeBSD, so I don't think it's the drivers' fault. ZFS achieves noticeably better results so it's probably not GEOM's.