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From: Cyril Hrubis <chrubis@suse.cz>
To: ltp@lists.linux.it
Subject: [LTP] [PATCH v4 0/4] New Fuzzy Sync library API
Date: Tue, 20 Nov 2018 14:09:11 +0100	[thread overview]
Message-ID: <20181120130911.GA9682@rei.lan> (raw)
In-Reply-To: <87bm6kasnl.fsf@rpws.prws.suse.cz>

Hi!
> Interesting that it is so slow on an x86 system, but it also makes sense
> with a single core because these are all multi-threaded tests. If the
> kernel is completely preemptive then it may be theoretically possible to
> trigger one of these bugs on a single core, but most people seem to
> think the probability of it happening is lower than on a multi-core
> machine.
> 
> I am tempted to simply exit the test with TCONF if it is a single core
> system. If we do allow them to run on a single core then we have to test
> that they work reasonably well on single cores (given enough
> time). Which I just don't think is worth doing based on the times you
> have given.

Well some of these test still trigger kernel crashes on single CPU
300Mhz arm quite reliably. If anything we may want to disable some
subset on slow single CPUs, but then someone would have to do the
selection which is probably not worth of the trouble.

-- 
Cyril Hrubis
chrubis@suse.cz

  reply	other threads:[~2018-11-20 13:09 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-05 15:42 [LTP] [PATCH v4 0/4] New Fuzzy Sync library API Richard Palethorpe
2018-11-05 15:42 ` [LTP] [PATCH v4 1/4] tst_timer: Add nano second conversions Richard Palethorpe
2018-11-05 15:42 ` [LTP] [PATCH v4 2/4] fzsync: Simplify API with start/end race calls and limit exec time Richard Palethorpe
2018-11-22 15:41   ` Cyril Hrubis
2018-11-23 14:55     ` Richard Palethorpe
2018-11-05 15:42 ` [LTP] [PATCH v4 3/4] Convert tests to use fzsync_{start, end}_race API Richard Palethorpe
2018-11-05 15:42 ` [LTP] [PATCH v4 4/4] fzsync: Add delay bias for difficult races Richard Palethorpe
2018-11-29 15:19   ` Cyril Hrubis
2018-11-16 14:33 ` [LTP] [PATCH v4 0/4] New Fuzzy Sync library API Li Wang
2018-11-20 11:35   ` Richard Palethorpe
2018-11-20 13:09     ` Cyril Hrubis [this message]
2018-12-03 11:40       ` Richard Palethorpe
2018-11-22 15:35 ` Cyril Hrubis

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