The following reply was made to PR amd64/152405; it has been noted by GNATS.
From: Andriy Gapon <a...@freebsd.org> To: =?ISO-2022-JP?B?IktPSUUgSGlkZXRha2EgKBskQjhxOT4xUU40IXc/dE19NTs4JhsoQg==?= =?ISO-2022-JP?B?KSI=?= <k...@suri.co.jp> Cc: bug-follo...@freebsd.org Subject: Re: amd64/152405: wrong user time is reported when CPU frequency throttled. Date: Wed, 24 Nov 2010 11:31:38 +0200 on 24/11/2010 09:17 KOIE Hidetaka ($B8q9>1QN4!w?tM}5;8&(B) said the following: > % sudo sysctl kern.eventtimer.timer="i8254" > Password: > kern.eventtimer.timer: LAPIC -> i8254 > % sudo sysctl dev.cpu.0.freq=1800 > dev.cpu.0.freq: 1800 -> 1800 > % time ./loop > ffffffff > 0.000u 4.773s 0:00.08 5962.5% 0+0k 0+0io 0pf+0w > % sudo sysctl dev.cpu.0.freq=1000 > dev.cpu.0.freq: 1800 -> 1000 > % time ./loop > ffffffff > 0.000u 4.773s 0:00.21 2271.4% 0+0k 0+0io 0pf+0w > % sleep 1 > ("sleep" had returned after sysctl kern.eventtimer.timer="LAPIC" on > another terminal) > % > > NOTE: user time is 0, system time is too long, and elapsed time is too short. > > And, wall-clock has been slow... > % ssh my-server date ; env LANG=C date > Wed Nov 24 16:03:11 JST 2010 > Wed Nov 24 16:01:15 JST 2010 Can you try to boot with kern.eventtimer.timer="i8254" in loader.conf? -- Andriy Gapon _______________________________________________ freebsd-amd64@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-amd64 To unsubscribe, send any mail to "freebsd-amd64-unsubscr...@freebsd.org"