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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20110304171506.0e27cde1.akpm@linux-foundation.org \
--to=akpm@linux-foundation.org \
--cc=bugme-daemon@bugzilla.kernel.org \
--cc=bugzilla-daemon@bugzilla.kernel.org \
--cc=ernstp@gmail.com \
--cc=netdev@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.