Perhaps the criticism of Ganglia maintainers is well deserved and this
bug will never be fixed. That said it would be more helpful if you could
help fix it. Lot of the original developers have moved on and we do need
help.
Vladimir
On Wed, 30 Mar 2011, Cameron L. Spitzer wrote:
As I said, it's a known bug that will never be fixed by ganglia's maintainers,
so if you
want it fixed you have to try to do it yourself. The bug is missing input
sanity
checking.
If it were documented someplace, you could call it a feature.
The HP DL3x0 and DL5x0 seem to be rather popular. We keep buying more because
everything
cheaper that we've tried has had performance or management problems. It's not
some
obscure, low volume product.
Martin Knoblauch wrote:
Hi Cameron,
there are two problems:
a) overflow. 32-bit counters will not last very long on 1 Gbit or faster.
They
should not repord PB spikes though.
b) some BMC adapters on Linux-64 had/have a really bad HW bug reporting
bogus
counters every now and then. That is supposed to be fixed by
REMOVE_BOGUS_SPIKES, but only on Linux. But no guarantees. It worked for
me on
3.0.7.
Cheers
Martin
------------------------------------------------------
Martin Knoblauch
email: k n o b i AT knobisoft DOT de
www: http://www.knobisoft.de
From: Cameron Spitzer <cspit...@nvidia.com>
To: Bostjan Skufca <bost...@a2o.si>
Cc: ganglia-general <ganglia-general@lists.sourceforge.net>
Sent: Tue, March 29, 2011 11:01:24 PM
Subject: Re: [Ganglia-general] Network bytes spikes
CPPFLAGS=-DREMOVE_BOGUS_SPIKES
had no effect in my installation.
We eventually found a patch in a non-ganglia forum somewhere, but I
can't find it now.
It basically added input sanity checking.
The problem is a 32-bit counter on a 1 Gbps NIC can overflow in less
than gmond's sampling interval.
When it overflows, ganglia treats the small negative number as a very
large positive.
This is a known ganglia bug. It's been around since 2003. You just
have to live with it, or try to fix it yourself.
-Cameron
Bostjan Skufca wrote:
That really seems to be the case. Speaking out of my head
now but it seems that I only see this on HP DL3x0 with
Broadcom Corporation NetXtreme II BCM5708 Gigabit Ethernet
(rev 12) interfaces. I've found some threads...
Anyway, does this really work? There is something in code
which eliminates 1e^13 and bigger or so it seems...
make CPPFLAGS=-DREMOVE_BOGUS_SPIKES
b.
On 29 March 2011 20:30, Vladimir Vuksan <vli...@veus.hr>
wrote:
I see it all the time :-(. According to Bernard
this is due to problem
with some of the Broadcom cards. Perhaps Bernard
can offer more insight.
On Tue, 29 Mar 2011 20:23:31 +0200, Bostjan
Skufca <bost...@a2o.si> wrote:
> Hi,
>
> occasionally I notice huge spikes in network
graphs in ganglia
(petabytes
> per second or so). Not sure whether those are
caused by gmond restarts
or
> network interface byte counter overflows or
something else.
> Is someone else also seeing similar behaviour?
Running latest ganglia
> (3.1.7).
>
> b.
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