From: Andrew Morton <akpm@linux-foundation.org>
To: netdev@vger.kernel.org
Cc: bugzilla-daemon@bugzilla.kernel.org,
bugme-daemon@bugzilla.kernel.org, ernstp@gmail.com
Subject: Re: [Bugme-new] [Bug 30462] New: High cpu usage when someone sends many ipv6 udp packages
Date: Fri, 4 Mar 2011 17:15:06 -0800 [thread overview]
Message-ID: <20110304171506.0e27cde1.akpm@linux-foundation.org> (raw)
In-Reply-To: <bug-30462-10286@https.bugzilla.kernel.org/>
(switched to email. Please respond via emailed reply-to-all, not via the
bugzilla web interface).
On Sat, 5 Mar 2011 01:10:53 GMT
bugzilla-daemon@bugzilla.kernel.org wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=30462
>
> Summary: High cpu usage when someone sends many ipv6 udp
> packages
> Product: Networking
> Version: 2.5
> Kernel Version: 2.6.38-rc3
> Platform: All
> OS/Version: Linux
> Tree: Mainline
> Status: NEW
> Severity: high
> Priority: P1
> Component: IPV6
> AssignedTo: yoshfuji@linux-ipv6.org
> ReportedBy: ernstp@gmail.com
> Regression: Yes
>
>
> Hi,
>
> while testing ipv6 performance on my local network I found the following
> problem.
> When sending lots of UDP packages over ipv6 to a machine running kernel
> 2.6.38-rc3 or later that machines become heavily loaded and X may stop
> responding for long periods of time for example, sound skips etc.
> A ksoftirqd and kworker thread each run 100% on my machine.
>
> I'm using this command to trigger this:
> iperf -c fe80::21f:d0ff:fe54:1ad4%eth0 -b 1000M -u -V
> You _don't_ have to setup an iperf server on the reciever.
>
> I have a gigabit network with a WNDR3700 with the new V1.0.7.98 firmware that's
> "IPv6 ready".
>
> I've used the kernels from http://kernel.ubuntu.com/~kernel-ppa/mainline/ to
> narrow down that this happens with 2.6.38-rc3 and later but not with 2.6.38-rc2
> and earlier like 2.6.37 and 2.6.35.
>
> The following ipv6 related changes were introduced between -rc2 and -rc3 that I
> can see. The "Revert 'administrative down' address handling changes." looked
> big...
> ipv6: Always clone offlink routes.
> ipv6: Revert 'administrative down' address handling changes.
>
next parent reply other threads:[~2011-03-05 1:16 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <bug-30462-10286@https.bugzilla.kernel.org/>
2011-03-05 1:15 ` Andrew Morton [this message]
2011-03-05 1:21 ` [Bugme-new] [Bug 30462] New: High cpu usage when someone sends many ipv6 udp packages David Miller
[not found] ` <AANLkTim9FKD7RRi02b+5=gQ85jNybqVtoT_ydW0imNev@mail.gmail.com>
2011-03-07 19:54 ` Ernst Sjöstrand
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