Date: Fri, 23 Aug 2013 13:05:51 -0400 From: John Baldwin <jhb@freebsd.org> To: freebsd-current@freebsd.org Cc: Venkata Duvvuru <VenkatKumar.Duvvuru@emulex.com> Subject: Re: OCE driver on Freebsd 10.0-Current Message-ID: <201308231305.51726.jhb@freebsd.org> In-Reply-To: <BF3270C86E8B1349A26C34E4EC1C44CB2BD65B1B@CMEXMB1.ad.emulex.com> References: <BF3270C86E8B1349A26C34E4EC1C44CB2BD65B1B@CMEXMB1.ad.emulex.com>
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On Friday, August 23, 2013 4:55:06 am Venkata Duvvuru wrote: > Hi, > > I'm running iperf on Emulex's OCE network adapter in Freebsd-10-current. At > heavy traffic (iperf with ~10 connections), iperf is hanging. The same > driver is working on all other Freebsd versions. > > top -HS shows the below information. > > PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU COMMAND > > 11 root 155 ki31 0K 128K CPU4 4 146:36 100.00% idle{idle: cpu4} > > 12 root -60 - 0K 688K CPU6 6 52:38 100.00% intr{swi4: clock} > > 11 root 155 ki31 0K 128K CPU2 2 148:42 99.66% idle{idle: cpu2} > > 11 root 155 ki31 0K 128K CPU7 7 149:24 99.27% idle{idle: cpu7} > > 11 root 155 ki31 0K 128K RUN 0 148:00 99.27% idle{idle: cpu0} > > 11 root 155 ki31 0K 128K CPU1 1 149:44 99.17% idle{idle: cpu1} > > 11 root 155 ki31 0K 128K CPU5 5 148:46 99.17% idle{idle: cpu5} > > 11 root 155 ki31 0K 128K CPU3 3 96:57 89.06% idle{idle: cpu3} > > 11 root 155 ki31 0K 128K RUN 6 149:11 13.87% idle{idle: cpu6} > > > > One interesting thing I observed is that intr is taking 100% on CPU6 when > iperf hangs, while iperf is running fine, the intr WCPU percentage is very > low. What does this below line mean? Why intr is 100% on CPU6?? > > 12 root -60 - 0K 688K CPU6 6 52:38 100.00% intr{swi4: clock} This is the thread that runs timers configured via callout_reset() or timeout(). Those are handled differently in 10 than in older branches. I suspect you have a callout that is rescheduling itself constantly or some such. -- John Baldwin
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