Date: Mon, 11 Jul 2011 16:41:04 +0200 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-current@freebsd.org Subject: Re: Heavy I/O blocks FreeBSD box for several seconds Message-ID: <ivf221$oo2$1@dough.gmane.org> In-Reply-To: <20110707200845.GA77049@troutmask.apl.washington.edu> References: <20110706170132.GA68775@troutmask.apl.washington.edu> <5080.1309971941@critter.freebsd.dk> <20110706180001.GA69157@troutmask.apl.washington.edu> <4E14A54A.4050106@freebsd.org> <4E155FF9.5090905@FreeBSD.org> <20110707151440.GA75537@troutmask.apl.washington.edu> <4E160C2F.8020001@FreeBSD.org> <20110707200845.GA77049@troutmask.apl.washington.edu>
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On 07/07/2011 22:08, Steve Kargl wrote: > 4BSD kernel gives for N = Ncpu + 1. > > 34 processes: 6 running, 28 sleeping > > PID USERNAME THR PRI NICE SIZE RES STATE C TIME CPU COMMAND > 1417 kargl 1 71 0 370M 294M RUN 0 1:30 79.39% sasmp > 1416 kargl 1 71 0 370M 294M RUN 0 1:30 79.20% sasmp > 1418 kargl 1 71 0 370M 294M CPU2 0 1:29 78.81% sasmp > 1420 kargl 1 71 0 370M 294M CPU1 2 1:30 78.27% sasmp > 1419 kargl 1 70 0 370M 294M CPU3 0 1:30 77.59% sasmp > ULE kernel gives for N = Ncpu + 1. > > 34 processes: 6 running, 28 sleeping > > PID USERNAME THR PRI NICE SIZE RES STATE C TIME CPU COMMAND > 1318 kargl 1 103 0 370M 294M CPU0 0 1:31 100.00% sasmp > 1319 kargl 1 103 0 370M 294M RUN 1 1:29 100.00% sasmp > 1322 kargl 1 99 0 370M 294M CPU2 2 1:03 87.26% sasmp > 1320 kargl 1 91 0 370M 294M RUN 3 1:07 60.79% sasmp > 1321 kargl 1 89 0 370M 294M CPU3 3 1:06 55.18% sasmp I can confirm this. Look at the priorities column for the two cases. For some reason (CPU affinity?) the loads get asymmetrical on ULE.
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