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From: Rick Jones on 21 May 2010 13:12
lancer6238(a)yahoo.com <lancer6238(a)yahoo.com> wrote:
> On May 21, 2:01 am, Rick Jones <rick.jon...(a)hp.com> wrote:
> > lancer6...(a)yahoo.com <lancer6...(a)yahoo.com> wrote:
> > > I did google for it, but couldn't find much. But myri.com does have a
> > > pretty good explanation of the statistics.
> >
> > Cool - can you post the URL?-)

> Sure.

> http://www.myri.com/serve/cache/531.html

Thanks - a web search didn't seem to find that page, just a PDF file
about the software interface to their card.

> So ethtool measures at the NIC level, and tcpdump measures at the
> kernel level? tshark should be the same as tcpdump, at the kernel
> level, right?

Both are using libpcap (iirc). And while the drops reported by
tcpdump (which gets them from libpcap) did happen in the kernel, they
are only in the packet sniffing path, not elsewhere, so I'm reluctant
to call them "kernel level" drops. To me that implies a drop along
some regular path.

> What about ifconfig? The "dropped packets" counter never seem to be
> more than 0.

I've never had to look it up, so someone else will have to comment.

rick jones

--
the road to hell is paved with business decisions...
these opinions are mine, all mine; HP might not want them anyway... :)
feel free to post, OR email to rick.jones2 in hp.com but NOT BOTH...
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