Date: Tue, 27 May 2003 07:02:26 +0700 (ICT) From: "Chatchawan Wongsiriprasert" <cws@miraclenet.co.th> To: freebsd-mobile@freebsd.org Subject: syncer_maxdelay patch (PR#21859) Message-ID: <1068.10.0.0.31.1053993746.squirrel@miranda.net0.intranet>
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Hi, I try to make my notebook use less energy by increasing kern.filedelay, kern.dirdelay and kern.metadelay and found that I can not increase these values greater than the syncer_maxdelay value that hard code to 32 seconds in FreeBSD 4.8 (you can set, it show ,but, ignored). After I search the Internet , I found that there is old FreeBSD PR (PR#21859 -- http://www.freebsd.org/cgi/query-pr.cgi?pr=PR%2321859) that propose to make syncer_maxdelay a kernel option and allow root to set kern.syncdelay that also limit maximum value of the previous 3 variables. The patch seem to be ignored ( the post date is Mon Oct 09 05:20:01 PDT 2000 ) , so never make it way to FreeBSD kernel. My question is 1. Why this patch is ignored? Is it too dangerous or it is useless? 2. Is there any adition ways to reduce the power need by the notebook in addition to: (1) reduce CPU speed (2) dim the backlight (3) Change system cron to delay the activation of some frequency run jobs such as atrun Regards, Chatchawan Wongsiriprasert
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