Date: Fri, 08 Apr 2011 13:12:47 +0200 From: =?windows-1252?Q?Daniel_Ger=9Eo?= <danger@rulez.sk> To: stable@freebsd.org Cc: Alexander Motin <mav@FreeBSD.org>, brucec@freebsd.org Subject: powerd / cpufreq question Message-ID: <4D9EEDAF.3020803@rulez.sk>
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Hello guys, I have a new machine with Xeon(R) CPU X5650 2666.77-MHz and I would like to utilize powerd(8) on it however, when I run `powerd -v -r90' I see something like this: load 64%, current freq 2668 MHz ( 0), wanted freq 5336 MHz load 120%, current freq 2668 MHz ( 0), wanted freq 5336 MHz load 173%, current freq 2668 MHz ( 0), wanted freq 5336 MHz load 62%, current freq 2668 MHz ( 0), wanted freq 5336 MHz load 82%, current freq 2668 MHz ( 0), wanted freq 5336 MHz load 110%, current freq 2668 MHz ( 0), wanted freq 5336 MHz even though the machine is according to top(1) ~90% idle; So I realized, that powerd might take the load as the sum of loads of all the cores (12), so I tried to tweak powerd arguments like this: `powerd -v -r 1000 -i 600' but that errors for me with: root@[s1-a ~]# powerd -v -r 1000 -i 600 powerd: 1000 is not a valid percent Well, that makes sense, but why powerd itself knows about load > 100% but doesn't allow me to specify it? Is this bug? I suppose not if it works for other people... Other question would be why powerd wants to set freq 5336, when it is not available at all (would be nice to have it heh.): dev.cpu.0.freq_levels: 2668/109000 2533/81000 2400/69000 2267/58000 2133/48000 2000/40000 1867/32000 1733/26000 1600/20000 1400/17500 1200/15000 1000/12500 The symptoms seem to show that there's a bug in the code calculating the cpu load. Any ideas what may be wrong? Examle of two consecutive cp_times sysctl output: kern.cp_times: 4182996 0 306925 85623 13563403 3164971 0 201479 93110 14679313 3450792 0 258166 80198 14349717 2795270 0 180252 76701 15086650 2952777 0 217156 119627 14849313 2418067 0 158594 73497 15488715 2408492 0 175131 104377 15450873 2003803 0 131790 75753 15927527 2456736 0 178894 36963 15466280 1607095 0 117396 4197 16410185 2127878 0 147639 30804 15832552 1406621 0 92686 1058 16638508 kern.cp_times: 4183013 0 306927 85626 13563469 3164980 0 201482 93110 14679390 3450796 0 258167 80199 14349800 2795274 0 180252 76701 15086735 2952780 0 217157 119629 14849396 2418070 0 158597 73497 15488798 2408499 0 175132 104377 15450954 2003804 0 131791 75753 15927614 2456744 0 178897 36963 15466358 1607098 0 117398 4197 16410269 2127880 0 147640 30804 15832638 1406621 0 92686 1058 16638597 Thanks! -- S pozdravom / Best regards Daniel Gerzo
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