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Date: Fri, 4 Mar 2011 17:15:06 -0800 From: Andrew Morton <akpm@...ux-foundation.org> To: netdev@...r.kernel.org Cc: bugzilla-daemon@...zilla.kernel.org, bugme-daemon@...zilla.kernel.org, ernstp@...il.com Subject: Re: [Bugme-new] [Bug 30462] New: High cpu usage when someone sends many ipv6 udp packages (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@...zilla.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@...ux-ipv6.org > ReportedBy: ernstp@...il.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. > -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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