From owner-freebsd-performance@FreeBSD.ORG Tue Oct 6 06:56:56 2009 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 B1DC7106568B for ; Tue, 6 Oct 2009 06:56:56 +0000 (UTC) (envelope-from serenity@exscape.org) Received: from ch-smtp01.sth.basefarm.net (ch-smtp01.sth.basefarm.net [80.76.149.212]) by mx1.freebsd.org (Postfix) with ESMTP id 6C57A8FC13 for ; Tue, 6 Oct 2009 06:56:56 +0000 (UTC) Received: from c83-253-248-99.bredband.comhem.se ([83.253.248.99]:42699 helo=mx.exscape.org) by ch-smtp01.sth.basefarm.net with esmtp (Exim 4.68) (envelope-from ) id 1Mv3yA-000307-4e; Tue, 06 Oct 2009 08:56:24 +0200 Received: from [192.168.1.5] (macbookpro [192.168.1.5]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by mx.exscape.org (Postfix) with ESMTPSA id 382D3123492; Tue, 6 Oct 2009 08:55:50 +0200 (CEST) Mime-Version: 1.0 (Apple Message framework v1076) Content-Type: text/plain; charset=us-ascii; format=flowed; delsp=yes From: Thomas Backman In-Reply-To: <200910051605.QAA06722@sopwith.solgatos.com> Date: Tue, 6 Oct 2009 08:55:48 +0200 Content-Transfer-Encoding: 7bit Message-Id: <88D64C60-D8ED-4622-959C-9946DBB99198@exscape.org> References: <200910051605.QAA06722@sopwith.solgatos.com> To: Dieter X-Mailer: Apple Mail (2.1076) X-Originating-IP: 83.253.248.99 X-Scan-Result: No virus found in message 1Mv3yA-000307-4e. X-Scan-Signature: ch-smtp01.sth.basefarm.net 1Mv3yA-000307-4e 56e6360244b6c40794a6187881e2ff62 Cc: freebsd-performance@freebsd.org Subject: Re: ZFS Re: A specific example of a disk i/o 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: Tue, 06 Oct 2009 06:56:56 -0000 On Oct 5, 2009, at 6:05 PM, Dieter wrote: > In message , > Thomas Backman writes: > >> I run 8.0-RC1/amd64 with ZFS on an A64 3200+ with 2GB RAM and an old >> 80GB 7200rpm disk. >> >> My problem is that I get completely unacceptable latency on console >> IO >> (both via SSH and serial console) when the system is performing disk >> IO. The worst case I've noticed yet was when I tried copying a core >> dump from a lzjb compressed ZFS file system to a gzip-9 compressed >> one, to compare the file size/compression ratio. screen(1) took at >> LEAST ten seconds - probably a bit more - I'm not exaggerating here - >> to switch to another window, and an "ls" in an empty directory also >> about 5-10 seconds. > > You might find the "RELENG_7 heavy disk = system crawls" thread > interesting: > > } I didn't actually solve it or do anything. > } I just upgraded to RELENG_8. > } > } Now it's behaving more like FreeBSD should. > } I can do sequential reads/writes and still > } use kbd/mouse/X11/buildworld and so on. Doesn't really help much I'm afraid, since 8.0-RC1 = RELENG_8 = stable/ 8. Been running current/stable-8 since May. Regards, Thomas