[linux-yocto] [PULL REQUEST] 3.10 - new preempt-rt branch - standard/preempt-rt/axxia/base]

Hong H. Pham hong.pham at windriver.com
Thu Jan 9 08:11:58 PST 2014

Hi Bruce.

> On 13-12-02 12:18 PM, Paul Butler wrote:
>> On Mon, Dec 02, 2013 at 12:12:20PM -0500, Bruce Ashfield wrote:
>>> On 13-12-02 12:10 PM, Paul Butler wrote:
>>>> The following changes since commit ee9480cd91b2b46325a2da9aa6ae779d8e4163c0:
>>>>     Merge branch 'standard/base' into standard/preempt-rt/base (2013-11-25 15:11:10 -0500)
>>>> are available in the git repository at:
>>> Before merging new -rt support, I'd like to see what sort of latency
>>> and driver testing has been done on the board.
>>> There's no sense merging support if it has latency spikes, or the
>>> drivers haven't been tested for locking safety and semantics.
>> Ok, same story for 3.4 -rt branch?
> Yep.

I've posted a summary of the test results and test logs for the tests
done on the 3.4 and 3.10 standard + preempt-rt axxia kernels.

acp34xx test summary:

axm55xx test summary:

Test logs (acp34xx + axm55xx):

I'll add some comments for the cyclictest graphs.  The latency variance in
the preempt-rt kernels is lower than the standard kernels (as one would expect)
but there are a few cases where the average latency is higher in the preempt-rt
kernels (axm55xx 3.10-rt).  I do not see any huge outliers (i.e. a latency sample
that's several hundred usecs) in the preempt-rt graphs, which to me indicates
that there are no latency spikes in the preempt-rt kernels.


> Bruce

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