From owner-freebsd-emulation@FreeBSD.ORG Fri Aug 8 20:21:55 2014 Return-Path: Delivered-To: emulation@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 65D30457 for ; Fri, 8 Aug 2014 20:21:55 +0000 (UTC) Received: from smarthost1.sentex.ca (smarthost1.sentex.ca [IPv6:2607:f3e0:0:1::12]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "smarthost.sentex.ca", Issuer "smarthost.sentex.ca" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 2A70726D9 for ; Fri, 8 Aug 2014 20:21:55 +0000 (UTC) Received: from [IPv6:2607:f3e0:0:4:f025:8813:7603:7e4a] (saphire3.sentex.ca [IPv6:2607:f3e0:0:4:f025:8813:7603:7e4a]) by smarthost1.sentex.ca (8.14.9/8.14.9) with ESMTP id s78KLo6m099278; Fri, 8 Aug 2014 16:21:50 -0400 (EDT) (envelope-from mike@sentex.net) Message-ID: <53E53146.6070205@sentex.net> Date: Fri, 08 Aug 2014 16:21:26 -0400 From: Mike Tancsa Organization: Sentex Communications User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.0 MIME-Version: 1.0 To: Adam Vande More Subject: Re: Making disk IO place nicely in a guest (VirtualBox) References: <53E3C33E.5030004@sentex.net> <53E3EA14.2060902@sentex.net> In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.74 Cc: "freebsd-emulation@freebsd.org" X-BeenThere: freebsd-emulation@freebsd.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Development of Emulators of other operating systems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 08 Aug 2014 20:21:55 -0000 On 8/7/2014 5:27 PM, Adam Vande More wrote: > > The error messages shown are classic swap on ZFS errors which is > inherently unstable especially under high IO loads. Hi Adam, I am still running into the guest crashing, or throwing disk errors even when the Hypervisor is not touching swap. I brought the Hypervisor OS upto date (r269715) and only ran the one guest instance # pstat -T 191/514621 files 0M/16384M swap space I tried with a RELENG7 instance, trying to extract a large tar file and it crashed as the parent's disk was too busy ad0: FAILURE - device detached g_vfs_done():ad0s1d[WRITE(offset=175350517766, length=2048)]error=6 /var: got error 6 while accessing filesystem panic: softdep_deallocate_dependencies: unrecovered I/O error cpuid = 0 On the RELENG_10 guest instance (r269271), I still get the odd ahcich0: Timeout on slot 15 port 0 ahcich0: is 00000000 cs 00000000 ss 0fff8000 rs 0fff8000 tfd 50 serr 00000000 cmd 1000dd17 (ada0:ahcich0:0:0:0): WRITE_FPDMA_QUEUED. ACB: 61 00 e8 7f 20 40 02 00 00 01 00 00 (ada0:ahcich0:0:0:0): CAM status: Command timeout (ada0:ahcich0:0:0:0): Retrying command When doing the same test with Linux as the hypervisor, there are no errors in the guests. ---Mike -- ------------------- Mike Tancsa, tel +1 519 651 3400 Sentex Communications, mike@sentex.net Providing Internet services since 1994 www.sentex.net Cambridge, Ontario Canada http://www.tancsa.com/