From owner-freebsd-stable@FreeBSD.ORG Tue Oct 13 18:30:06 2009 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 7E4101065679; Tue, 13 Oct 2009 18:30:06 +0000 (UTC) (envelope-from ler@lerctr.org) Received: from thebighonker.lerctr.org (thebighonker.lerctr.org [192.147.25.65]) by mx1.freebsd.org (Postfix) with ESMTP id 4BDE48FC12; Tue, 13 Oct 2009 18:30:06 +0000 (UTC) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=lerami; d=lerctr.org; h=Received:Date:From:To:cc:Subject:In-Reply-To:Message-ID:References:User-Agent:MIME-Version:Content-Type:X-Spam-Score:X-LERCTR-Spam-Score:X-Spam-Report:X-LERCTR-Spam-Report:DomainKey-Status; b=OaAihjrQQjs482/WKO23G9w8sejHNh3jFQwvR6l2vS410R9t3zFgPj3lTEhWl1hEkTgQL9KafxywvMxQ/wA9HEw0jd+PgGAibBrxY0c1eejVhiwsgAPA2//bz8HagNXOaDHyEd5ylvbNPONWayu27CfGMoAWpTG7UgtWzHeQlOs=; Received: from thebighonker.lerctr.org ([192.147.25.65]:62293) by thebighonker.lerctr.org with esmtpsa (TLSv1:AES256-SHA:256) (Exim 4.69 (FreeBSD)) (envelope-from ) id 1Mxm8K-00095c-EV; Tue, 13 Oct 2009 13:30:05 -0500 Date: Tue, 13 Oct 2009 13:30:02 -0500 (CDT) From: Larry Rosenman To: Ivan Voras In-Reply-To: <9bbcef730910131057i71db846et1f0d4aeadef5e302@mail.gmail.com> Message-ID: References: <9bbcef730910130633w150571a0k461fb4e67a51fb1d@mail.gmail.com> <9bbcef730910131057i71db846et1f0d4aeadef5e302@mail.gmail.com> User-Agent: Alpine 2.00 (BSF 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed X-Spam-Score: -4.4 (----) X-LERCTR-Spam-Score: -4.4 (----) X-Spam-Report: SpamScore (-4.4/5.0) ALL_TRUSTED=-1.8,BAYES_00=-2.599 X-LERCTR-Spam-Report: SpamScore (-4.4/5.0) ALL_TRUSTED=-1.8,BAYES_00=-2.599 DomainKey-Status: no signature Cc: freebsd-stable@freebsd.org Subject: Re: Extreme console latency during disk IO (8.0-RC1, previous releases also affected according to others) 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: Tue, 13 Oct 2009 18:30:06 -0000 On Tue, 13 Oct 2009, Ivan Voras wrote: > 2009/10/13 Larry Rosenman : > >>>>> note huge packet loss. It looks like it's VM fault or something like it. >>>> >>>> It sounds like the VM is failing to execute the guest during certain >>>> types of I/O. A bit of scheduler tracing in the host OS probably wouldn't go >>>> amiss to confirm that the VM really is suspending the guest >>> >>> It's VMWare ESXi underneath, which is *Officially Not Linux* though some >>> ducks may disagree - anyway, I suspect tracing the host in this way is next >>> to impossible without some kind of diamondium-level contract. >>> >> What information do you need? I have a platinum VMWare contract. >> >> What version of ESXi? > > Hi, > > It is ESXi 3.5 - but if the problem is really in ESXi I presume anyone > could reproduce it. My setup is nothing special - Xeon 5405, 8 GB RAM, > SATA drives on ICH9. > > As for what data is needed, it depends on what you can get - from this > discussion thread it looks like it would be enough to verify that disk > IO doesn't leave VM processes waiting (i.e. that disk IO doesn't > interfere with CPU-bound or idle virtual machines). Though now when I > think of it - doesn't Linux ATA driver poll IO in some funky way, > expecting to get lower latency that way? > Have you looked at the information available via the performance tab(s) in the client pointing at the ESXi server? -- Larry Rosenman http://www.lerctr.org/~ler Phone: +1 512-248-2683 E-Mail: ler@lerctr.org US Mail: 430 Valona Loop, Round Rock, TX 78681-3893