Date: Fri, 23 Sep 2005 11:49:10 +0200 From: Bruno Ducrot <ducrot@poupinou.org> To: Nate Lawson <nate@root.org> Cc: acpi@freebsd.org Subject: Re: Hard hang with powerd Message-ID: <20050923094910.GC21906@poupinou.org> In-Reply-To: <4332D9E5.1020607@root.org> References: <4330020C.5030302@mcsi.pp.ru> <20050920135958.GA1616@poupinou.org> <433016F8.903@mcsi.pp.ru> <20050920145932.GB1616@poupinou.org> <4332505A.5050201@mcsi.pp.ru> <4332D9E5.1020607@root.org>
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On Thu, Sep 22, 2005 at 09:20:53AM -0700, Nate Lawson wrote: > Maxim Maximov wrote: > >Bruno Ducrot wrote: > > > >>On Tue, Sep 20, 2005 at 06:04:40PM +0400, Maxim Maximov wrote: > >> > >>>Bruno Ducrot wrote: > >>> > >>>>On Tue, Sep 20, 2005 at 04:35:24PM +0400, Maxim Maximov wrote: > >>>> > >>>> > >>>>>Hi, all. > >>>>> > >>>>> I've got hard hangs with latest CURRENT in a few seconds after > >>>>> enabling powerd. Here's loader.conf: > >>>>> > >>>>># cat /boot/loader.conf > >>>>>hw.psm.synaptics_support=1 > >>>>>debug.mpsafevfs=1 > >>>>>acpi_perf_load="YES" > >>>>>cpufreq_load="YES" > >>>>>debug.acpi.disabled="sysres" > >>>>>bcmwl5_sys_load="YES" > >>>>> > >>>>> What else can I do to help debug it? > >>>>> > >>>> > >>>> > >>>>The 2 logical CPUs need to set the same MSRs at the same time, > >>>>but if the second one is forced to be idle, I'm not sure if p4tcc will > >>>>work fine. > >>>> > >>>>Therefore, I'm wondering if this hard hang happens with a SMP kernel > >>>>and hyperthreading is enabled, or if this happens with a UP kernel. > >>>> > >>> > >>>Yes, kernel is SMP one. > >>> > >>># sysctl machdep.hyperthreading_allowed > >>>machdep.hyperthreading_allowed: 1 > >>> > >> > >>It's weird. Could you please try with a kernel without SMP for > >>testing purpose? > >> > > > >It's fine. Now I'm running UP kernel with 'powerd -v' > > Bruno, can you expand more on what you think the problem is? The p4tcc > driver writes to the MSR on all CPUs, including logical ones. We switch > cpus using sched_bind(). So the thread will run on the first CPU, write > to the MSR, then switch to the second CPU and write to the MSR. I > thought this is how the datasheet says the thermal MSR must be used on > SMP. It's also what Linux does I believe. > I know that already. The problem is I don't know why this failed. -- Bruno Ducrot -- Which is worse: ignorance or apathy? -- Don't know. Don't care.
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