Date: Wed, 3 Oct 2007 05:21:55 +0400 From: Yuri Pankov <yuri.pankov@gmail.com> To: Jeff Roberson <jroberson@chesapeake.net> Cc: current@freebsd.org Subject: Re: ULE/yielding patch for testing. Message-ID: <20071003012155.GA1327@darklight.abyss> In-Reply-To: <20071003005009.GA1103@darklight.abyss> References: <20071002165007.D587@10.0.0.1> <20071003005009.GA1103@darklight.abyss>
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On Wed, Oct 03, 2007 at 04:50:09AM +0400, Yuri Pankov wrote: > On Tue, Oct 02, 2007 at 04:53:33PM -0700, Jeff Roberson wrote: > > Enclosed is a patch that does two things: > > > > 1) Reduces UP context switch time by over 10% making it faster than 4BSD > > on UP. On SMP it's hard to compare since ULE can do as many as 30x as many > > switches per second on my 8way system. > > > > 2) Restores old sched_yield() behavior from 6.x. This was changed in > > -current unintentionally I think. > > > > I'd appreciate any extra testing. The ULE context switch time improvements > > required some changes to the frequency that we recalculate priorities. I'm > > mostly interested in hearing whether this causes any regression in normal > > workloads. > > > > Those of you still using 4BSD can also verify that the yield changes don't > > cause any problems there. > > > > Thanks, > > Jeff > > Jeff, > > Patch applied cleanly, though with new kernel I got a panic just after > boot - on xdm startup, I guess (crashdump wasn't saved), a lot of the same messages > (copied by hand): > > cpuid = 0 > panic: _mtx_lock_sleep: recursed on non-recursive mutex > audit_mtx@/usr/src/sys/security/audit_worker.c:518 > > and after few seconds system just hangs. > > Any hints? > > -- > Yuri Pankov <yuri.pankov@gmail.com> Sorry for being so verbose... It's UP amd64 with SCHED_ULE kernel config: include GENERIC ident DARKLIGHT nooptions SCHED_4BSD options SCHED_ULE -- Yuri Pankov <yuri.pankov@gmail.com>
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