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Re: [Qemu-devel] [PATCH] kvmclock: Ensure time in migration never goes b
Re: [Qemu-devel] [PATCH] kvmclock: Ensure time in migration never goes backward
Mon, 05 May 2014 20:26:04 +0200
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is it possible to have kvmclock jumping forward?
Because I've reproducible case when at about 1 per 20 vm restores, VM freezes
for couple of hours and then resumes with date few hundreds years ahead.
Happens only with kvmclock.
And this patch seems to fix very similar issue so maybe it's all the same bug.
I'm fairly sure it is the exact same bug. Jumping backward is like jumping
forward by a biiiiig amount :)
I've tested your path on my test VM... don't know if it's pure luck or
not, but it didn't hang with over 70 restores.
The message "KVM Clock migrated backwards, using later time" fires every
time, but VM is healthy after resume.
Re: [Qemu-devel] [PATCH] kvmclock: Ensure time in migration never goes backward, Marcelo Tosatti, 2014/05/05