From: Chris Friesen <chris.friesen@windriver.com>
To: lkml <linux-kernel@vger.kernel.org>
Subject: weird /proc/stat output with newer (4.1, 4.2) kernels in kvm guest on 3.10 host?
Date: Wed, 2 Mar 2016 11:12:17 -0600 [thread overview]
Message-ID: <56D71EF1.2090404@windriver.com> (raw)
Hi,
I'm running a 3.10-based host with libvirt 1.2.12 and qemu 2.2.
Running a Fedora23 cloud image as a guest, the "cpu" lines in /proc/stat seem to
be hardly changing:
[fedora@fedora23 boot]$ uptime
17:01:50 up 44 min, 1 user, load average: 3.00, 2.99, 2.79
[fedora@fedora23 boot]$ grep cpu /proc/stat
cpu 13 0 124 65880 165 0 0 23088 0 0
cpu0 1 0 4 21967 67 0 0 21866 0 0
cpu1 8 0 52 21877 66 0 0 623 0 0
cpu2 4 0 67 22034 30 0 0 598 0 0
Running an Ubuntu 15.10 cloud image as a guest, everything looks fine:
ubuntu@ubuntu1510:/boot$ uptime
17:02:28 up 28 min, 1 user, load average: 3.00, 2.98, 2.42
ubuntu@ubuntu1510:/boot$ grep cpu /proc/stat
cpu 3932 130 443061 46116 257 0 5 12974 0 0
cpu0 1296 130 139886 14960 195 0 1 12343 0 0
cpu1 1330 0 151580 15570 35 0 0 315 0 0
cpu2 1305 0 151595 15586 26 0 4 316 0 0
In both cases the current_clocksource is kvm-clock. Not sure if it's relevent,
but Fedora has "CONFIG_NO_HZ_FULL=y" and "CONFIG_NO_HZ_FULL_ALL is not set", and
does not specify "nohz_full=" in the boot parameters. Ubuntu has
"CONFIG_NO_HZ_FULL is not set".
Anyone have any ideas what might be going on?
Chris
next reply other threads:[~2016-03-02 17:12 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-02 17:12 Chris Friesen [this message]
2016-03-03 18:36 ` weird /proc/stat output with newer (4.1, 4.2) kernels in kvm guest on 3.10 host? Chris Friesen
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