Date: Thu, 07 Aug 2014 17:05:24 -0400 From: Mike Tancsa <mike@sentex.net> To: Adam Vande More <amvandemore@gmail.com> Cc: "freebsd-emulation@freebsd.org" <emulation@freebsd.org> Subject: Re: Making disk IO place nicely in a guest (VirtualBox) Message-ID: <53E3EA14.2060902@sentex.net> In-Reply-To: <CA%2BtpaK2VzHWrDg1H0XFhEtFPpZ_Q77iCDOJDLBSBS_8YpWEN2Q@mail.gmail.com> References: <53E3C33E.5030004@sentex.net> <CA%2BtpaK2VzHWrDg1H0XFhEtFPpZ_Q77iCDOJDLBSBS_8YpWEN2Q@mail.gmail.com>
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This is a multi-part message in MIME format. --------------030603020707090405040702 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit On 8/7/2014 4:53 PM, Adam Vande More wrote: > > > Is your swap device ZFS backed like a ZVOL or something? Hi Adam, The hypervisor does indeed have swap on zfs. I will try disabling swap in the guest. I am pretty sure the panic was due to the guest hitting and stalling on swap inside the VM. The guest dmesg is attached. There does not seem to be much memory pressure on the hypervisor. The hypervisor disk is a little slow, as I am experimenting with hast to sync across to another zfs box. However, thats only for a zfs volume that holds the VM disk images. The OS is not "hastified" In the hypervisor # pstat -T 284/514622 files 51M/16384M swap space CPU: 2.6% user, 0.0% nice, 6.6% system, 1.7% interrupt, 89.1% idle Mem: 191M Active, 277M Inact, 14G Wired, 25M Cache, 1618M Buf, 315M Free ARC: 7831M Total, 491M MFU, 6986M MRU, 83M Anon, 39M Header, 232M Other Swap: 16G Total, 51M Used, 16G Free The machine has 16G. Should I think of limiting ARC ? ---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/ --------------030603020707090405040702 Content-Type: text/plain; charset=windows-1252; name="dmesg.txt" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="dmesg.txt" IyBjYXQgL3Zhci9ydW4vZG1lc2cuYm9vdCAKQ29weXJpZ2h0IChjKSAxOTkyLTIwMTQgVGhl IEZyZWVCU0QgUHJvamVjdC4KQ29weXJpZ2h0IChjKSAxOTc5LCAxOTgwLCAxOTgzLCAxOTg2 LCAxOTg4LCAxOTg5LCAxOTkxLCAxOTkyLCAxOTkzLCAxOTk0CiAgICAgICAgVGhlIFJlZ2Vu dHMgb2YgdGhlIFVuaXZlcnNpdHkgb2YgQ2FsaWZvcm5pYS4gQWxsIHJpZ2h0cyByZXNlcnZl ZC4KRnJlZUJTRCBpcyBhIHJlZ2lzdGVyZWQgdHJhZGVtYXJrIG9mIFRoZSBGcmVlQlNEIEZv dW5kYXRpb24uCkZyZWVCU0QgMTAuMC1TVEFCTEUgIzAgcjI2OTI3MTogV2VkIEp1bCAzMCAw MzoyMDoxMCBVVEMgMjAxNAogICAgcm9vdEBncmluZC5mcmVlYnNkLm9yZzovdXNyL29iai91 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