Date: Fri, 17 Jan 2014 15:38:54 -0800 From: Adrian Chadd <adrian@freebsd.org> To: Mike Tancsa <mike@sentex.net> Cc: FreeBSD-STABLE Mailing List <freebsd-stable@freebsd.org> Subject: Re: forwarding performance with releng7 vs 8 vs 9 vs 10 on an Alix box Message-ID: <CAJ-Vmo=dyY9r7H9j9D-w-50OWBwb1Cc=9ws0soqhXrwAZkPgaA@mail.gmail.com> In-Reply-To: <52D98A83.90805@sentex.net> References: <52D98A83.90805@sentex.net>
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On 17 January 2014 11:54, Mike Tancsa <mike@sentex.net> wrote: > We have a couple of sites where we found it was possible to live lock / > crash an alix box if there were too many pps flowing across the unit in > RELENG_8. The same device with releng_7 did not show the same > behaviour. As these boxes are remote and the watchdog would kick in, I > was not able to debug things very much. Even back in the lab, it wasnt > always easy to trigger the crash synthetically, but I could. > > Has anyone done any network performance comparisons between the various > branches for speed and stability for single core embedded platforms like > the ALIX or Soekris ? No, but it would be nice to actually do that, then figure out why it's livelocking. I can introduce livelock in a single core of a much, much more powerful box by doing certain bad things. It's almost like the scheduler needs to have some kind of "fuck it, I'm going FIFO!" mode. -a
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