This bug is Debian specific: The endless looping inside the kernel system call is not present in a current openvz upstream kernel.
I'm refering to Debian bug 571457 which, according to Maximilian, is probably the same as bug 542633 . The details: I had filed an upstream bug report http://bugzilla.openvz.org/show_bug.cgi?id=1443 . In that bug's discussion, Pavel Emelyanov asked me to verify whether the bug was present in their git kernel. So I grabbed their kernel source git clone git://git.openvz.org/pub/linux-2.6.26-openvz openvz-git-kernel For configuration, I used Debian's linux-image-2.6.26-2-openvz-686, Version 2.6.26-21lenny4 as my baseline, via cp /boot/config-2.6.26-2-openvz-686 .config I compiled the sources via make-kpkg --initrd kernel_image (which didn't at first work. The directory permissions of /usr/src had infected my git directory with g+s, and, after a long time of churning, make-kpkg decided it didn't like that.) The good news: After booting into that kernel, my example runs fine as expected! No more endless looping and CPU cycle eating. Instead, a mere 20 milliseconds user time consumed by the server. The Perl client is through in 1.5 seconds real runtime. For comparison, directly on the host machine (a somewhat dated box), the server's user stays the same, the client's real is about 0.1 seconds faster. After two runs on a freshly started openvz client, I get 511 tcpsndbuf fail counts grep tcpsnd /proc/user_beancounters tcpsndbuf 0 70400 70000 150000 511 which was to be expected. Regards, Andreas -- Dr. Andreas Krüger, Berater, DV-RATIO NORDWEST GmbH andreas.krue...@dv-ratio.com GPG/PGP Fingerprint 8063 4A9B 362D 4220 A546 14C1 EA19 AADC FD44 5EB7 DV-RATIO NORDWEST GmbH Tel: +49 (0)211 / 577 996-0 Fax: +49 (0)211 / 577 996-26 http://www.dv-ratio.com <http://www.dv-ratio.com> Sitz der Gesellschaft Habsburgerstraße 12, 40547 Düsseldorf Registergericht Düsseldorf HRB 34330 USt-IdNr.: DE811321837 Steuer-Nr.: 809/44031 Geschäftsführung: Günter Gerstmann Prokura: Trudbert Vetter, Uwe Wolfram DV-RATIO - "Kompetenz und Zuverlässigkeit seit 1980"
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