On Tue, Sep 09, 2008 at 01:42:34PM -0600, Witham, Timothy D wrote:
> >I am testing ganglia in a cluster of linux but we are getting this
> >confusing peaks in the bytes/s and in the packets/s (image attached)

is it Red Hat Linux and a broadcom adapter?, x86 running in 64 bit mode?

> I have been able to minimize this significantly by using code from svn
> trunk and building with
> 
>         make CPPFLAGS=-DREMOVE_BOGUS_SPIKES

the code for doing that is also part of 3.1 as well, so there is really no
need to patch your local ganglia with code from svn just for that, but as you
said you will need to build it with the right flags.
 
> IMHO, that should be the default.

AFAIK the reason why it is not the default is because it is only presented
in some version of linux and a specific adapter, which are both very popular
but not the general setup, but will let Martin elaborate on that, specially
since from what I remember the driver problem has been fixed already in the
kernel.

there is also the problem that it could throw away valid data which is
naturally spiky.

Carlo

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