From owner-freebsd-current@FreeBSD.ORG  Fri Aug 23 18:55:19 2013
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTP id 812525C3
 for <freebsd-current@freebsd.org>; Fri, 23 Aug 2013 18:55:18 +0000 (UTC)
 (envelope-from jhb@freebsd.org)
Received: from bigwig.baldwin.cx (bigwig.baldwin.cx [IPv6:2001:470:1f11:75::1])
 (using TLSv1 with cipher ADH-CAMELLIA256-SHA (256/256 bits))
 (No client certificate requested)
 by mx1.freebsd.org (Postfix) with ESMTPS id E7CAD2BD4
 for <freebsd-current@freebsd.org>; Fri, 23 Aug 2013 18:55:17 +0000 (UTC)
Received: from jhbbsd.localnet (unknown [38.105.238.108])
 by bigwig.baldwin.cx (Postfix) with ESMTPSA id C2D24B98A;
 Fri, 23 Aug 2013 14:55:16 -0400 (EDT)
From: John Baldwin <jhb@freebsd.org>
To: freebsd-current@freebsd.org
Subject: Re: OCE driver on Freebsd 10.0-Current
Date: Fri, 23 Aug 2013 13:05:51 -0400
User-Agent: KMail/1.13.5 (FreeBSD/8.2-CBSD-20110714-p28; KDE/4.5.5; amd64; ; )
References: <BF3270C86E8B1349A26C34E4EC1C44CB2BD65B1B@CMEXMB1.ad.emulex.com>
In-Reply-To: <BF3270C86E8B1349A26C34E4EC1C44CB2BD65B1B@CMEXMB1.ad.emulex.com>
MIME-Version: 1.0
Content-Type: Text/Plain;
  charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
Message-Id: <201308231305.51726.jhb@freebsd.org>
X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.2.7
 (bigwig.baldwin.cx); Fri, 23 Aug 2013 14:55:16 -0400 (EDT)
Cc: Venkata Duvvuru <VenkatKumar.Duvvuru@emulex.com>
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.14
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
 <freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-current>, 
 <mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
 <mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 23 Aug 2013 18:55:19 -0000

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