Date: Sat, 4 Oct 2008 08:10:41 +0200 From: Stefan Ehmann <shoesoft@gmx.net> To: Jonathan Chen <jonc@chen.org.nz> Cc: freebsd-stable@freebsd.org Subject: Re: top/ps CPU percentage broken on 7.1-PRERELEASE? (works with SCHED_4BSD) Message-ID: <200810040810.42363.shoesoft@gmx.net> In-Reply-To: <20081003093937.GA4944@osiris.chen.org.nz> References: <200810031003.14400.shoesoft@gmx.net> <20081003093937.GA4944@osiris.chen.org.nz>
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On Friday 03 October 2008 11:39:37 Jonathan Chen wrote: > On Fri, Oct 03, 2008 at 10:03:13AM +0200, Stefan Ehmann wrote: > > The CPU % displayed by top/ps for single processes seem to be broken > > here. > > > > E.g. for a simple shell loop: > > top starts displaying around 20% for bash. Within some seconds it > > converges to 0%. > > > > ps values seem to be consistent with top. > > > > The value in the time column seems to be correct. On every refresh it > > increases by 2s. > > > > last pid: 19353; load averages: 0.99, 0.90, 0.76 up 0+00:37:29 > > 09:07:00 > > 119 processes: 2 running, 114 sleeping, 1 stopped, 2 zombie > > CPU: 98.5% user, 0.0% nice, 1.1% system, 0.4% interrupt, 0.0% idle > > Mem: 376M Active, 407M Inact, 144M Wired, 47M Cache, 110M Buf, 13M Free > > Swap: 1280M Total, 1280M Free > > > > PID USERNAME THR PRI NICE SIZE RES STATE TIME WCPU COMMAND > > 19352 stefan 1 99 0 4432K 2080K RUN 0:03 15.48% bash > > > > All other process are using 0% CPU. > > > > I did a buildworld/kernel yesterday to be sure everything is in sync. I > > have CURRENT on a different hard disk. Haven't seen the problem there. > > Are there any relevant fixes that weren't MFCed? > > > > Does anyone else see this? This is a single CPU i386 machine. > > Yes, my Java processes now run at 800% at times on my dual processor > AMD64 system. I've seen this behaviour too some time ago. Don't know if it's related to what I see. I recompiled my kernel with SCHED_4BSD and things work fine. So it seems to be a SCHED_ULE issue.
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