Date: Thu, 5 Jan 2017 15:52:13 -0600 From: "Jay West" <jwest@ezwind.net> To: "'Hoyer-Reuther, Christian'" <Christian.Hoyer-Reuther@cac-chem.de>, =?iso-8859-1?Q?'Roger_Pau_Monn=E9'?= <roger.pau@citrix.com> Cc: <freebsd-xen@freebsd.org>, <owner-freebsd-xen@freebsd.org> Subject: RE: 11-RELEASE and live migration Message-ID: <001701d2679d$f99eb560$ecdc2020$@ezwind.net> In-Reply-To: <41E487BC91654544B2B8F31096F2D9D4D1B060ABBF@ex1> References: <001f01d250a6$05ca4160$115ec420$@ezwind.net> <a8486e84c86c73ae1a7d68a06d969671@ultra-secure.de> <003501d250af$032dd580$09898080$@ezwind.net> <41E487BC91654544B2B8F31096F2D9D4D1B060A925@ex1> <20161212103148.5prkggi3ix4zoxyv@dhcp-3-221.uk.xensource.com> <41E487BC91654544B2B8F31096F2D9D4D1B060AA3E@ex1> <002101d25484$c0a068c0$41e13a40$@ezwind.net> <20161214140224.rbg5h3v2opa3q3sj@dhcp-3-221.uk.xensource.com> <41E487BC91654544B2B8F31096F2D9D4D1B060ABBF@ex1>
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Roger wrote... > I'm able to see these glitches, as said the VM doesn't really hang, it > just gets stuck for a long time (and I think that depends on the > uptime differences between the source and destination hosts). In the > meantime, could you please test if changing the timecounter from > XENTIMER to any other (like HPET or > ACPI-fast) solves the issue? > > # sysctl -w kern.timecounter.hardware=ACPI-fast Christian replied... I changed the timecounter from XENTIMER to ACPI-fast and then I did about 10 migrations between our 3 hosts. I always started the next migration a few seconds after the previous migration finished. The VM didn't stuck now and I didn't see the VGABios screen on the console. I can also add to this... changing timecounter to ACPI-fast definitely fixes the problem. I can migrate a handful of freebsd11 vm's back and forth and all stay running correctly. So... bug in XENTIMER?
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