SCHED_ULE bug (was Re: cpuminer mines only on one core regardless of "--threads" option)

[Andrey Chernov]

On 16.01.2014 11:20, Alexander wrote:
> 
> 
> 14.01.2014, 22:32, "Alexander" <ags18 at yandex.ru>:
>> 14.01.2014, 20:14, "Subbsd" <subbsd at gmail.com>:
>>
>>>  On Tue, Jan 14, 2014 at 7:43 PM, Andrey Chernov <ache at freebsd.org> wrote:
>>>>   On 14.01.2014 17:01, Alexander wrote:
>>>>>   on Freebsd 9.2 x64 on 5 different PCs I installed net-p2p/cpuminer
>>>>>   from ports and by "pkg install" - result is the same - minerd mines
>>>>>   only on one core regardless of "--threads" option.
>>>>   ...
>>>>>   # top -P
>>>>>   CPU 0:  0.0% user,  0.0% nice,  0.0% system,  0.0% interrupt,  100% idle
>>>>>   CPU 1:  0.0% user,  0.0% nice,  0.0% system,  0.0% interrupt,  100% idle
>>>>>   CPU 2:  0.0% user,  0.0% nice,  0.0% system,  0.0% interrupt,  100% idle
>>>>>   CPU 3:  0.0% user,  100% nice,  0.0% system,  0.0% interrupt,  0.0% idle
>>>>   This is SCHED_ULE bug, I see _all_ processes (not minerd only in
>>>>   particular) stuck to the last CPU too (top's 'C' column is equal to the
>>>>   last CPU and never changes), latest -stable i386. It disappears for me
>>>>   switching to SCHED_4BSD.
>>>>
>>
>> reboot didn't help (try on 3 different PCs)
> ...
> minerd was started from cron after reboot immediately and broke SMP, so when I disable minerd from cron and reboot - SMP works fine.
> I think Andrey Chernov said here the reason http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/163585#reply3
> So this bug is alive - on 9.1 and 9.2 x64 releases.
> I didn't try SCHED_4BSD yet, cause don't wont to use not-generic kernel because of mining only, but for interest I'll try it on one machine on this weekends.

I just try it on latest x64 -current, result is exact the same: the bug
exist with SCHED_ULE and not with SCHED_4BSD. Something is very wrong in
SCHED_ULE+cpuset_setaffinity chain.