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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