netdev - Re: Fw: [Bug 65261] New: Packet loss or excessive packet delay repeatedly for some seconds

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Message-ID: <20131123215959.GA2570@tansi.org>
Date:	Sat, 23 Nov 2013 23:00:00 +0100
From:	Arno Wagner <arno@...ner.name>
To:	Ben Hutchings <ben@...adent.org.uk>, netdev@...r.kernel.org,
	stephen@...workplumber.org
Subject: Re: Fw: [Bug 65261] New: Packet loss or excessive packet delay
 repeatedly for some seconds

On Sat, Nov 23, 2013 at 21:39:33 CET, Hannes Frederic Sowa wrote:
> On Sat, Nov 23, 2013 at 09:20:47PM +0100, Arno Wagner wrote:
> > On Sat, Nov 23, 2013 at 17:45:58 CET, Ben Hutchings wrote:
> > > On Sat, 2013-11-23 at 13:11 +0100, Arno Wagner wrote:
> > > > On Sat, Nov 23, 2013 at 05:33:59 CET, Hannes Frederic Sowa wrote:
> > > [...]
> > > > > Could you try dropwatch while the packet drops are happening?
> > > > > Often it is helpful to check ip monitor all if events happen during bursty
> > > > > losses.
> > > > 
> > > > Sorry, but dropwatch is not in Debian and compiling it from sources
> > > > seem to require something called "rpmbuild". Hence I cannot use
> > > > it or at least would have to write my own Makefile for it. 
> > > 
> > > You could use 'perf script net_dropmonitor' instead.
> > 
> > That gets me "invalid or unsupported event: 'skb:kfree_skb'"
> > with 3.10.17, so I guess it will not work with 3.10.19 either.
> 
> You need CONFIG_DROP_MONITOR enabled on your kernel build.

Interestingly, that option is not even there in .config. 
Must be someting that "make oldconfig" messed up along 
the way, as making a new .config with all default values 
does have it commented out as "not set".

After a bit of poking around, I found it and its pre-requisites 
net/Kconfig, where it says it depends on INET && TRACEPOINTS.
After a bit more poking I finally found TRACEPOINTS on init/Kconfig,
depending on nothing. But it does not get displayed as selectable
in "make menuconfig".  As far as I can tell, it is not constrained
and should show up? 

So I really have no clue how to turn this on...

Arno




-- 
Arno Wagner,     Dr. sc. techn., Dipl. Inform.,    Email: arno@...ner.name
GnuPG: ID: CB5D9718  FP: 12D6 C03B 1B30 33BB 13CF  B774 E35C 5FA1 CB5D 9718
----
There are two ways of constructing a software design: One way is to make it
so simple that there are obviously no deficiencies, and the other way is to
make it so complicated that there are no obvious deficiencies. The first
method is far more difficult.  --Tony Hoare
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