[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Qemu-devel] [PATCH] kvmclock: Ensure time in migration never goes b

From: Marcin Gibuła
Subject: Re: [Qemu-devel] [PATCH] kvmclock: Ensure time in migration never goes backward
Date: Mon, 05 May 2014 20:26:04 +0200
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0

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.


reply via email to

[Prev in Thread] Current Thread [Next in Thread]