Date: Fri, 8 Aug 2008 02:00:03 GMT From: Jakub Jasinski <jakub.jasinski@utoronto.ca> To: freebsd-bugs@FreeBSD.org Subject: Re: misc/126230: weird process cpu usage stats and weird load Message-ID: <200808080200.m78203NE066322@freefall.freebsd.org>
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The following reply was made to PR misc/126230; it has been noted by GNATS. From: Jakub Jasinski <jakub.jasinski@utoronto.ca> To: Gavin Atkinson <gavin@freebsd.org> Cc: freebsd-gnats-submit@FreeBSD.org Subject: Re: misc/126230: weird process cpu usage stats and weird load Date: Thu, 7 Aug 2008 21:58:55 -0400 Please note that all of the daemons that are consuming CPU and a.out (the compiled sample select() program) are select()-ing. For example, look at the top output in the bug description and my last post with sample code. Also, please refer to (I filed a new bug report--this one more specific than "weird something or other"): http://www.freebsd.org/cgi/query-pr.cgi?pr=126289 (and refer to my previous post in this bug report.) I don't think a.out should be consuming ANY cpu while it's select()-ing, even on a 386. When comparing kern_select() in 6.2 and 7.0, the one slight difference is how thread locking is invoked... In any event, before and after: mail2# sysctl dev.cpu.0 dev.cpu.0.%desc: ACPI CPU dev.cpu.0.%driver: cpu dev.cpu.0.%location: handle=\_PR_.CPU0 dev.cpu.0.%pnpinfo: _HID=none _UID=0 dev.cpu.0.%parent: acpi0 dev.cpu.0.freq: 2322 dev.cpu.0.freq_levels: 2322/-1 2031/-1 1741/-1 1451/-1 1161/-1 870/-1 580/-1 290/-1 dev.cpu.0.cx_supported: C1/0 dev.cpu.0.cx_lowest: C1 dev.cpu.0.cx_usage: 100.00% mail2# sysctl dev.cpu.0 dev.cpu.0.%desc: ACPI CPU dev.cpu.0.%driver: cpu dev.cpu.0.%location: handle=\_PR_.CPU0 dev.cpu.0.%pnpinfo: _HID=none _UID=0 dev.cpu.0.%parent: acpi0 dev.cpu.0.freq: 2322 dev.cpu.0.freq_levels: 2322/-1 2031/-1 1741/-1 1451/-1 1161/-1 870/-1 580/-1 290/-1 dev.cpu.0.cx_supported: C1/0 dev.cpu.0.cx_lowest: C1 dev.cpu.0.cx_usage: 100.00% Thanks anyway. In the meantime, I'm going to try FreeBSD 6.3. On Thu, 7 Aug 2008 20:40:06 GMT Gavin Atkinson <gavin@freebsd.org> wrote: > The following reply was made to PR misc/126230; it has been noted by > GNATS. > > From: Gavin Atkinson <gavin@FreeBSD.org> > To: bug-followup@FreeBSD.org > Cc: > Subject: Re: misc/126230: weird process cpu usage stats and weird load > Date: Thu, 7 Aug 2008 21:35:17 +0100 (BST) > > Just a thought: what is the output of "sysctl dev.cpu.0" both > before, and after running rsync? If for some reason your CPU is > ending up in a very low frequency mode, then it's not inconceivable > that daemons would appear to take a much greater share of the CPU > than usual. Also, I'm assuming the clock maintains time normally? > _______________________________________________ > freebsd-bugs@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-bugs > To unsubscribe, send any mail to > "freebsd-bugs-unsubscribe@freebsd.org"
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