Date: Thu, 03 Mar 2005 21:37:05 -0800 From: Nate Lawson <nate@root.org> To: Kevin Oberman <oberman@es.net> Cc: current@FreeBSD.ORG Subject: Re: patch: p4tcc and speedstep cpufreq drivers Message-ID: <4227F401.7000204@root.org> In-Reply-To: <20050302235623.BA3925D07@ptavv.es.net> References: <20050302235623.BA3925D07@ptavv.es.net>
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Kevin Oberman wrote: > OK. This makes me feel a bit better, but I still think I'll leave TCC > out of the equation as it makes the various frequency steps vary uneven > to the point that lowering dev.cpu.0.freq would increase performance > (and the reverse, as well) and it causes my system to hang when > throttled back too far. It never hangs with TCC disabled although my > lowest "frequency" is now just 150 MHz. Would you test with hint.acpi_throttle.0.disabled="1" instead of disabling p4tcc? I think p4tcc is not the problem, it's the combination of the two. I think there are some problems when both the chipset (externally) and processor (internally) assert STOPCLOCK. If this works for you with no hangs, I'll commit code to disable acpi_throttle when p4tcc is present. p4tcc is more efficient than acpi_throttle since the latter is done through the chipset, giving more chance for race conditions, latency, etc. -- Nate
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