Date: Mon, 2 Jul 2007 20:31:32 +0100 From: Thomas Sparrevohn <Thomas.Sparrevohn@btinternet.com> To: Jeff Roberson <jroberson@chesapeake.net> Cc: freebsd-current@freebsd.org Subject: Re: New SCHED_SMP diff. Message-ID: <200707022031.32359.Thomas.Sparrevohn@btinternet.com> In-Reply-To: <20070702120147.F552@10.0.0.1> References: <20070701224452.I552@10.0.0.1> <200707021956.01128.Thomas.Sparrevohn@btinternet.com> <20070702120147.F552@10.0.0.1>
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On Monday 02 July 2007 20:02:41 Jeff Roberson wrote: > On Mon, 2 Jul 2007, Thomas Sparrevohn wrote: > > > > > Hi, can you try sysctl kern.sched.steal_busy=1? Please tell me if that > improves things. This will resolve short-term load imbalances by stealing > threads from other processors. > > Thanks, > Jeff > If I enable "kern.sched.steal_busy" the system panics within a couple of seconds with a "spin lock held to long". Mind you that the kernels I have use has all debugging turned off e.g. no WITHNESS etc. so it could be that - I quite a while if I am to rerun all tests with WITHNESS etc enabled - Do you want me to or do you have a suggestion as to why it panics?
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