Date: 05 Jul 2003 15:36:03 +0800 From: Khairil Yusof <kaeru@pd.jaring.my> To: Jeff Roberson <jroberson@chesapeake.net> Cc: freebsd-current@freebsd.org Subject: Re: Panic in scheduler code with SCHED_ULE during boot to multi-user. Message-ID: <1057390562.799.17.camel@daemon.home.net> In-Reply-To: <20030704045443.J17881-100000@mail.chesapeake.net> References: <20030704045443.J17881-100000@mail.chesapeake.net>
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On Fri, 2003-07-04 at 16:55, Jeff Roberson wrote: > Excellent debugging. Can you tell me whats in kseq_cpu[0] and > kseq_cpu[1]? I think I may know what the problem is. Do you have some > negative niced processes or some positive nice processes? Just tried the fix, and tried out ULE with KSE (universal map). In single user mode, it works great (build world -j8) but it has performance problems once I get into multiuser mode where there are background processes. Basically everything just slows down and becomes jerky, and some idle processes are pegging idle cycles on one CPU. It is still jerky even when I kill them and load drops (ie. 0.1% user). Can you tell me what info you need, for me to help find out what is causing background processes to have such an adverse affect on performance with KSE?
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