From owner-freebsd-stable@FreeBSD.ORG Sun Feb 14 23:23:38 2010 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 048A4106568B for ; Sun, 14 Feb 2010 23:23:38 +0000 (UTC) (envelope-from boydjd@jbip.net) Received: from mail-fx0-f228.google.com (mail-fx0-f228.google.com [209.85.220.228]) by mx1.freebsd.org (Postfix) with ESMTP id 264018FC1B for ; Sun, 14 Feb 2010 23:23:36 +0000 (UTC) Received: by fxm28 with SMTP id 28so45327fxm.31 for ; Sun, 14 Feb 2010 15:23:36 -0800 (PST) MIME-Version: 1.0 Received: by 10.239.184.6 with SMTP id w6mr441400hbg.4.1266189815119; Sun, 14 Feb 2010 15:23:35 -0800 (PST) In-Reply-To: <33c6b0bc1002141512t29c2650cp2f2dba866b9d7415@mail.gmail.com> References: <33c6b0bc1002141315y6671e91dife7e80b926cb9d0b@mail.gmail.com> <33c6b0bc1002141512t29c2650cp2f2dba866b9d7415@mail.gmail.com> From: Joshua Boyd Date: Sun, 14 Feb 2010 18:23:15 -0500 Message-ID: <33c6b0bc1002141523q72eed878qf900230026ff34b3@mail.gmail.com> To: freebsd-stable@freebsd.org Content-Type: text/plain; charset=ISO-8859-1 X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Subject: Re: More zfs benchmarks X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 14 Feb 2010 23:23:38 -0000 On Sun, Feb 14, 2010 at 6:12 PM, Joshua Boyd wrote: > > > On Sun, Feb 14, 2010 at 5:58 PM, Jonathan Belson wrote: > >> On 14 Feb 2010, at 21:15, Joshua Boyd wrote: >> >> > Repeated the same tests on my AMD64 dual core 4GB system with 5 HD103SI >> 1T >> > drives in raidz1 on a Supermicro PCI-E controller, running 8-STABLE. >> >> [ snip results ] >> >> I was hoping I'd get something closer to these figures... >> >> > Here are my relevant settings: >> > >> > vfs.zfs.prefetch_disable=0 >> > vfs.zfs.zil_disable="1" >> >> I already had prefetch disabled, but retrying with zil disabled made no >> difference. >> > > That setting actually enables prefetch ... I have 4GB of RAM, so I felt > safe turning it on. > > >> >> What is your arc_min and arc_max set to? >> > > System Memory: > Physical RAM: 4015 MB > Free Memory : 2130 MB > > ARC Size: > Current Size: 783 MB (arcsize) > Target Size (Adaptive): 783 MB (c) > Min Size (Hard Limit): 101 MB (zfs_arc_min) > Max Size (Hard Limit): 808 MB (zfs_arc_max) > > ARC Size Breakdown: > Most Recently Used Cache Size: 97% 764 MB (p) > Most Frequently Used Cache Size: 2% 18 MB (c-p) > > ARC Efficency: > Cache Access Total: 148383 > Cache Hit Ratio: 66% 98434 [Defined State for buffer] > Cache Miss Ratio: 33% 49949 [Undefined State for Buffer] > REAL Hit Ratio: 65% 96744 [MRU/MFU Hits Only] > > Data Demand Efficiency: 99% > Data Prefetch Efficiency: 0% > > CACHE HITS BY CACHE LIST: > Anon: 1% 1515 [ New > Customer, First Cache Hit ] > Most Recently Used: 28% 27931 (mru) [ Return > Customer ] > Most Frequently Used: 69% 68813 (mfu) [ Frequent > Customer ] > Most Recently Used Ghost: 0% 175 (mru_ghost) [ Return > Customer Evicted, Now Back ] > Most Frequently Used Ghost: 0% 0 (mfu_ghost) [ Frequent > Customer Evicted, Now Back ] > CACHE HITS BY DATA TYPE: > Demand Data: 12% 12369 > Prefetch Data: 0% 0 > Demand Metadata: 85% 84375 > Prefetch Metadata: 1% 1690 > CACHE MISSES BY DATA TYPE: > Demand Data: 0% 6 > Prefetch Data: 96% 47994 > Demand Metadata: 3% 1580 > Prefetch Metadata: 0% 369 > --------------------------------------------- > > > >> >> > >> > On Sun, Feb 14, 2010 at 3:34 PM, Michael Loftis >> wrote: >> >>> >> >> You really need to test with at least 4GB of data, else you're just >> testing >> >> caching speeds on writing. Use a test suite like bonnie++ and you'll >> see >> >> I'd expect to get more than 4MB/s if I was just measuring cache speed :-) >> >> Cheers, >> >> --Jon >> >> > > > -- > Joshua Boyd > JBipNet > > E-mail: boydjd@jbip.net > > http://www.jbip.net > -- Joshua Boyd JBipNet E-mail: boydjd@jbip.net http://www.jbip.net