Date: Fri, 04 Mar 2005 11:45:07 -0800 From: Nate Lawson <nate@root.org> To: Eric Anderson <anderson@centtech.com> Cc: freebsd-acpi@freebsd.org Subject: Re: System running hot / CPU freq changes randomly Message-ID: <4228BAC3.1020707@root.org> In-Reply-To: <422623A6.5090605@centtech.com> References: <42260B46.5010100@centtech.com> <42261B72.8070602@root.org> <422623A6.5090605@centtech.com>
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Eric Anderson wrote: > Nate Lawson wrote: > >> Eric Anderson wrote: >> >>> I've jsut upgraded from 5.3-STABLE to -CURRENT, and have a few things >>> I've noticed. One, my machine runs much hotter - it used to stay >>> around 40 - 41C, but not stays around 49C. Also, it actually seems >>> like it's running slower - and maybe it is. It looks like the cpu >>> frequency is changing all the time, hopping around from one freq to >>> another, for no real reason that I can tell. >>> I'm running on a dell D600 (1.6GHZ Pentium M), with -CURRENT as of >>> last night. >>> I can provide any additional information needed.. >>> >>> >>> Here's what I mean (on AC, not battery): >>> [ 12:48:25 root@neutrino ~ ]# sysctl dev.cpu.0.freq >>> dev.cpu.0.freq: 1600 >>> [ 12:48:27 root@neutrino ~ ]# sysctl dev.cpu.0.freq >>> dev.cpu.0.freq: 400 >>> [ 12:48:28 root@neutrino ~ ]# sysctl dev.cpu.0.freq >>> dev.cpu.0.freq: 400 >> >> >> >> Are you running powerd? If you have powerd_enable="YES" in >> /etc/rc.conf, it defaults to adaptive control. I _thought_ I made the >> default "NO" until we get more testing. > > > Yes, I am using it. It was default to no, but I enabled it in hopes > that it would help battery life and reduce temperature. I realized I > didn't really have the settings right, so after setting some lines in > rc.conf and restarting powerd, it seems to have stopped flopping around. > I'm willing to help debug/test.. > > >>> hw.acpi.cpu.cx_supported: C1/1 C2/1 C3/85 C4/185 >>> hw.acpi.cpu.cx_lowest: C1 >>> hw.acpi.cpu.cx_usage: 100.00% 0.00% 0.00% 0.00% >> >> >> >> I had to disable C2 and higher by default due to some C3 problems some >> users were having. Hopefully we'll sort this out at some point and >> re-enable it by default. >> >> You can get the old values back through /etc/rc.conf. Add: >> >> performance_cx_lowest="LOW" >> economy_cx_lowest="LOW" >> >> (Or explicitly use "C3" if C4 doesn't work right for you). > > > These are the settings I have right now: > powerd_enable="YES" > powerd_flags="-a max -b adaptive" > performance_cx_lowest="HIGH" # Online CPU idle state > performance_cpu_freq="1600" # Online CPU frequency > economy_cx_lowest="LOW" # Offline CPU idle state > economy_cpu_freq="NONE" # Offline CPU frequency You should not use *_cpu_freq if you're running powerd since that will handle the transitions for you. The cx_lowest stuff is fine although it probably wouldn't hurt you to use C2 or C3 while on AC power. It will save heat and I don't think affects performance much. I'm not sure why your frequency is changing while on AC power. You set "-a max". powerd should only do adaptive stuff while on battery, according to your settings above. -- Nate
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