RCU related performance regression in 3.3

[Josh Boyer]

Hi Paul,

We've had a few reports of some boot slowdowns with the 3.3 rebase we
did in Fedora 16.  One of our users volunteered to bisect a vanilla
kernel and wound up at "rcu: Permit dyntick-idle with callbacks pending
(commit 7cb924990)".  You can find more details in the bug [1], but it's
been reported on both physical hardware and in virtual machines.

Have you seen anything like this in your testing?  Given the user used a
vanilla 3.3 kernel, I'm wondering if there is a targetted fix that might
be backported.  If so, it would be good to get that headed to the 3.3.y
stable tree.

josh

[1] https://bugzilla.redhat.com/show_bug.cgi?id=806548
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/