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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