Messages in this thread | | | Date | Sun, 28 Apr 2019 00:48:58 +0000 | From | Eric Wong <> | Subject | Re: Strange issues with epoll since 5.0 |
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Deepa Dinamani <deepa.kernel@gmail.com> wrote: > I tried to replicate the failure on qemu. > I do not see the failure with N=32.
> Does it work for N < 32?
Depends on number of cores you have; I have 4 cores, 8 threads with HT; so I needed to have a lot of load on the machine to get it to fail (it takes about 1 minute).
cmogstored is intended to run on machines that were already saturated in CPU/memory from other processes, but not HDD I/O bandwidth.
> Does any other signal work?
SIGCONT does, via:
perl -i -p -e 's/SIGURG/SIGCONT/g' `git ls-files`
> Are there any other architectures that fail?
I don't have other arches (well, 32-bit x86, but I've never really tried cmogstored on that, even).
> Could you help me figure out how to run just the one test that is failing?
Just running one test won't trigger since it needs a busy machine; but:
make test/mgmt_auto_adjust.log (and "rm make test/mgmt_auto_adjust.log" if you want to rerun)
Thanks for looking into this. Fwiw, cmogstored uses epoll in strange and uncommon ways which has led to kernel bugfixes in the past.
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