netdev - RE: Lost ping responses

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Message-ID: <063D6719AE5E284EB5DD2968C1650D6D1747BBCF@AcuExch.aculab.com>
Date:	Wed, 20 Aug 2014 09:29:07 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Cong Wang' <cwang@...pensource.com>
CC:	Jamal Hadi Salim <jhs@...atatu.com>,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: RE: Lost ping responses

From: Cong Wang
> On Tue, Aug 19, 2014 at 4:35 AM, David Laight <David.Laight@...lab.com> wrote:
> > From: Jamal Hadi Salim
> >
> >> > Any ideas how to find out where the discards are happening?
> >> > It might just be somewhere that would affect other traffic flows.
> >>
> >> netstat -s
> >
> > Thanks - 'Ip: outgoing packets dropped' increments for every lost response.
> >
> > Next step is to work out what that means...
> >
> 
> Try dropwatch, it should give you better hints.

That involves finding/compiling a version that will run on ubuntu 13.10 server.
And working out which extra ubuntu packages it needs to work.
On a system I've built the sources on (after fixing LDLIBS) I get the
error 'Unable to find NET_DM family' - whatever that means.
but that isn't the system dropping packets.

	David