Date: Thu, 20 Mar 2014 18:01:31 +0100 From: Markus Gebert <markus.gebert@hostpoint.ch> To: Christopher Forgeron <csforgeron@gmail.com> Cc: freebsd-net@freebsd.org, Rick Macklem <rmacklem@uoguelph.ca>, Jack Vogel <jfvogel@gmail.com> Subject: Re: 9.2 ixgbe tx queue hang Message-ID: <D5D34624-EE94-417C-84DD-93207CDEF8DC@hostpoint.ch> In-Reply-To: <CAB2_NwDMbJP7ph786s=aJoo8Pfy7pz5mivt7HYzA12KZSZLZUg@mail.gmail.com> References: <CAB2_NwDG=gB1WCJ7JKTHpkJCrvPuAhipkn%2BvPyT%2BxXzOBrTGkg@mail.gmail.com> <FA262955-B3A9-48EC-828B-FF0D4D5D0498@hostpoint.ch> <CAB2_NwDMbJP7ph786s=aJoo8Pfy7pz5mivt7HYzA12KZSZLZUg@mail.gmail.com>
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On 20.03.2014, at 16:50, Christopher Forgeron <csforgeron@gmail.com> = wrote: > Markus, >=20 > I just wanted to clarify what dtrace will output in a 'no-error' > situation. I'm seeing the following during a normal ping (no errors) = on > ix0, or even on a non-problematic bge NIC: >=20 >=20 This is expected. This dtrace probe will fire if any kernel function = that is run in the context of a process named =93ping=94 returns 27, = which is what EFBIG stands for. Kernel functions can return 27 for many = reasons, not just an error, or they can return void (not sure how dtrace = handles this case). Anyway, this dtrace one-liner is only meant to be = used in the error case. Otherwise it=92s probably useless. And even when = the problem occurs, you need to pick the right stack trace, and dig = around kernel sources to verify that the functions indeed return EFBIG = and not any integer that happens to be 27 by accident. Markus > On Thu, Mar 20, 2014 at 7:40 AM, Markus Gebert > <markus.gebert@hostpoint.ch>wrote: >=20 >> Also, if you have dtrace available: >>=20 >> kldload dtraceall >> dtrace -n 'fbt:::return / arg1 =3D=3D EFBIG && execname =3D=3D "ping" = / { stack(); >> }' >>=20 >> while you run pings over the interface affected. This will give you = hints >> about where the EFBIG error comes from. >>=20 >>=20 >>=20 >>=20 >>=20 > _______________________________________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" >=20
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