Date: Tue, 07 Sep 2004 10:36:59 -0600 From: Scott Long <scottl@samsco.org> To: rnejdl@ringofsaturn.com Cc: current@freebsd.org Subject: Re: Beta 3 Crash with machdep.hlt_logical_cpus Message-ID: <413DE3AB.9080707@samsco.org> In-Reply-To: <33307.12.148.147.242.1094574244.squirrel@mail.ringofsaturn.com> References: <33307.12.148.147.242.1094574244.squirrel@mail.ringofsaturn.com>
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Rusty Nejdl wrote: > I am running on a Dual 1.8 Ghz Xeon box and I have hyperthreading turned > on in the BIOS such that it appears that I have 4 processors. I am not > physically at the machine right now but wanted to report a problem I had > today. I changed machdep.hlt_logical_cpus from 0 to 1 while running and > the system completely froze up. I don't know what error occurred as I > wasn't at the machine and have rebooted since then. I do know that using > 5.2 I was able to do this and the sytstem would move all the processes to > the correct CPU's. Not sure if anyone else has seen this. > > Rusty Nejdl > This is a known problem with the SCHED_ULE scheduler. Fixing it doesn't appear to be trivial, so we are considering other alternatives for RELENG_5 and 5.3, including switching back to the 4BSD scheduler. The 4BSD scheduler also appears to be much more stable than ULE, especially with kernel preemption enabled. Scott
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