On 2014-02-20 01:31, Hal Murray wrote:
Just a heads-up in case you hit this, or want to avoid it.
The symptom is BUG: scheduling while atomic
https://bugzilla.redhat.com/show_bug.cgi?id=1065087
The discussion at
https://lkml.org/lkml/2014/2/18/77
confirms that it's the low-latency path that is buggy.
My setup works fine under low load, but hits the BUG when I do something like
compile the ntp package.
3.11 works fine. (for me) There was major work in the serial area for 3.12
I'll send an update when/if it gets fixed.
I noticed the developer was asking for performance criteria.
How about suggesting no degradation in kernel PPS performance after change?
That should be measurable within the kernel and externally with ntpd.
--
Take care. Thanks, Brian Inglis
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