Date: Thu, 28 Aug 2003 02:24:42 -0700 From: Terry Lambert <tlambert2@mindspring.com> To: deischen@FreeBSD.org Cc: David Xu <davidxu@FreeBSD.org> Subject: Re: Call for thread testers Message-ID: <3F4DCA5A.753F2E8C@mindspring.com> References: <Pine.GSO.4.10.10308272107130.23439-100000@pcnet5.pcnet.com>
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Daniel Eischen wrote: > > Use a kernel without witness compiled in, libthr should be faster > > than this result. > > Well, what got me was the variance in time. Most of the time > it takes twice as long. And it doesn't seem to hang for a few > seconds at any one point; it plods along consistently, just > twice as slow overall. It could be mutex contention and > false wakeups or something... > > > But I always can not finish this test for libthr on my SMP machine, > > in most time, it will deadlock, so I can not give you a reliable result. > > It hangs in my thread yield test also; don't know why. I never saw if Julian's IPI patch was committed or not. I would expect a lot of CPU wakeup latency without it, if you HLT in the idle loop... -- Terry
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