Date: Sat, 13 Aug 2005 19:38:42 -0700 From: "Kevin Oberman" <oberman@es.net> To: acpi@freebsd.org Subject: Annoyances with passive thermal code (acpi_thermal) Message-ID: <20050814023842.C0D845D07@ptavv.es.net>
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I've noted an unpleasant mis-behavior in acpi_thermal. 1. Killed powerd 2. Set dev.cpu.0.freq to 1200 (I was on batteries and wanted to stretch them) 3. Started a BIG build...openoffice The temp went up over _PSV and the CPU was slowed to 1050. The CPU cooled for a while and the freq was reset to 1800 which started draining my battery way too fast. Ideally, acpi_thermal should store the frequency when it cuts speed and restore that speed when the CPU cools, not the maximum speed. Not a huge problem as I caught it before my battery was too badly impacted, but it would have been really annoying if I had had the battery die before I noticed. Since I run with write cache on my disks, this could have been a disaster with all of the file activity the build of openoffice was generating. (OK. Building openoffice under these circumstances my be a bad idea, but it takes many hours to build and I try to get it built when I can.) -- R. Kevin Oberman, Network Engineer Energy Sciences Network (ESnet) Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab) E-mail: oberman@es.net Phone: +1 510 486-8634
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