Date: Mon, 02 Jan 2012 04:13:38 +0100 From: "Julian H. Stacey" <jhs@berklix.com> To: mobile@freebsd.org Cc: mav@freebsd.org, Gary Jennejohn <gljennjohn@googlemail.com>, "Clive Ashbolt \(Work\)" <clive.ashbolt@t-systems.com>, "Julian H. Stacey" <jhs@berklix.com>, Boris Kochergin <spawk@acm.poly.edu>, brucec@freebsd.org Subject: powerd to use sysctl to import temps to drop freq to avoid heat crash Message-ID: <201201020313.q023DdG2051231@fire.js.berklix.net>
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Hi mobile@freebsd.org, CC a few others. I propose to hack src/usr.sbin/powerd/powerd.c To import temperatures via sysctl, & if too high, to forcibly reduce CPU frequency, even if CPU load is high, because my new HP Pavillion notebook keeps over heating & crashing. dmesg & sysctl etc diagnostics at http://berklix.com/~jhs/hardware/hp/pavilion/dm3-1155ea/ CPU: AMD Athlon(tm) Neo X2 Dual Core Processor L335 (1595.96-MHz K8-class CPU) Origin = "AuthenticAMD" Id = 0x60fb2 Family = f Model = 6b Stepping = 2 Is this re-inventing the wheel ? Anyone else out there working on or know of similar code ? mgdiff 8.2-RELEASE/src/usr.sbin/powerd/powerd.c \ /pub/FreeBSD/branches/-current/src/usr.sbin/powerd/powerd.c does not show a lot of difference. >From http://www.freebsd.org/cgi/cvsweb.cgi/src/usr.sbin/powerd/powerd.c I added a few people to CC particularly mav@ has an interesting comment Wed Jun 16 15:09:45 2010 UTC ( Freq sysctls are quite heavy due to set of malloc()/free() calls. Avoid reading current frequency on every period. Instead do it only after changing and periodically from time to time if somebody else change it. Also dynamically decrease sampling frequency up to 4 times on inactivity, Gary J: there's a comment at Fri Jan 9 22:10:07 2009 re. more then 2 CPUs I added Clive who may have some URL to CPU temps. To /boot/loader.conf I just added acpi_hp_load="YES" (after reboot) does not produce /dev/hpcmi Running 80% idle (just a fsck_ufs) I see: hw.acpi.thermal.tz0.temperature: 67.0C dev.acpi_hp.0.hdd_temperature: 4 Cheers, Julian -- Julian Stacey, BSD Unix Linux C Sys Eng Consultants Munich http://berklix.com Reply below not above, cumulative like a play script, & indent with "> ". Format: Plain text. Not HTML, multipart/alternative, base64, quoted-printable.
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