Comment 3 for bug 1270873
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| Gary S. Robertson (gary-robertson) wrote | #3 |
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a60fb26
(Get the code!)
I'm afraid I should have been adding comments to this bug rather than #1260397 Latest NO_HZ_FULL patches cause CPU stalls & spinlock deadlocks in 3.10 PREEMPT_RT kernel ... I have been working mostly with the 3.12 kernels and the latest NO_HZ_FULL patches for those. However the non-RT kernels (both 3.10 and 3.12) look as though they may be acheiving satisfactory CPU isolation and NO_HZ_FULL operation, but the LAVA test shell becomes unresponsive under those conditons. For some reason it does not time out as intended and return an 'indefinite isolation' result. Instead it just stops communicating and LAVA subsequently times out and returns with no test results.
The 3.12.10-rt15 kernel on my last run returned quickly with isolation durations which were all zero seconds in length.
The 3.10.27-rt25 kernel appears to have actually crasshed during this test sometime after hot-unplugging CPU 1.
Have temporarily suspended further testing on this pending completion of preparations for the RT presentation at LCA14.