From owner-freebsd-current@FreeBSD.ORG Fri Feb 13 22:24:12 2009 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 9B516106566B for ; Fri, 13 Feb 2009 22:24:12 +0000 (UTC) (envelope-from ivoras@gmail.com) Received: from mail-fx0-f16.google.com (mail-fx0-f16.google.com [209.85.220.16]) by mx1.freebsd.org (Postfix) with ESMTP id 003D38FC1A for ; Fri, 13 Feb 2009 22:24:11 +0000 (UTC) (envelope-from ivoras@gmail.com) Received: by fxm9 with SMTP id 9so216295fxm.19 for ; Fri, 13 Feb 2009 14:24:11 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:sender:received:in-reply-to :references:date:x-google-sender-auth:message-id:subject:from:to:cc :content-type:content-transfer-encoding; bh=YqNoW4LdO5HLSDAy73Qb78MGganIW2/OC0tjEdEL7/s=; b=tEsa9k5B6YQ9jQvty4r+xAsuwEhyX++JoubYfSAYBbf0Gc3K6GkBEDftd/sz/qvTVZ FTxZ80hQvKLP80tOe9UThc4ASFNvO/880jdSV2xuQ+OVEa/ebhAJ+ggXNEdi0eZtQhGc L1q2sgpTdbLe87ANR/jvPNUaHUf7uJqKh04j0= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:cc:content-type :content-transfer-encoding; b=J3xAp1fsDCY9GYkQWIZxLDBTBLe1spPlaNieg3sPJP9wz3FRhhv0D7Rzcj5F1mzhQZ PmrRdSLaUPjLMUagg8ICXIhHAkajil9LGdLKOST88NysujEqn1FfB96jjfjr8Mo+tj5S WUYE2Fvq2OD9MoJ4hJaCoXRc5VQSsn+2QuGqU= MIME-Version: 1.0 Sender: ivoras@gmail.com Received: by 10.181.206.7 with SMTP id i7mr878436bkq.57.1234563668962; Fri, 13 Feb 2009 14:21:08 -0800 (PST) In-Reply-To: <4995DFE5.1020205@samsco.org> References: <499551B9.7050805@samsco.org> <4995DFE5.1020205@samsco.org> Date: Fri, 13 Feb 2009 23:21:08 +0100 X-Google-Sender-Auth: 1492621c167cccb0 Message-ID: <9bbcef730902131421r53efa13dq371658888747f387@mail.gmail.com> From: Ivan Voras To: Scott Long Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Cc: freebsd-current@freebsd.org, freebsd-stable@freebsd.org Subject: Re: HEADS UP: Major CAM performance regression X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 13 Feb 2009 22:24:12 -0000 2009/2/13 Scott Long : > Ivan Voras wrote: >> >> Scott Long wrote: >> >>> I have committed a fix for this problem for FreeBSD 8-CURRENT as of SVN >>> revision 188570. FreeBSD 7-STABLE will be updated with the fix in a few >>> days once I've gotten confirmation that the fix works and doesn't cause >>> any adverse side-effects. Anyone wanting to help in this validation >>> effort should apply the attached patch to their kernel source tree and >>> recompile. Please contact me directly by email to report if the problem >>> is fixed for you. >> >> I notice that write performance on an ESXi 3.5 hosted system is doubled, >> but read performance remains the same (in bonnie++). >> On a CISS system there is no significant change. > > bonnie is an unreliable tool for measuring performance. I'll try your suggestion if you have one. (except if it's about bonnie++ primarily measuring sequential read/write - if a system can't do sequential IO well, it probably won't do random IO well)