>Robert, can you describe the settings you are using on your spirent system?
>what size logs is it sending?

the logs are ~ 39Bytes/each

>how many sources is it simulating?

its simulating 8 different sources

>is it just setting the hostname in the messages or is it using a different 
>souce 
IP/MAC for each different hostname?

It is sending the hostname 

>as I asked before, is this a dedicated switch or a VLAN on a switch that's 
>doing 
other things?

its a vlan on a switch thats doing other tests, but the other tests are very 
minimal compared to this

>is this a bare metal machine, a VM, a blade server with shared infrastructure, 
etc?

its a bare metal machine: hp, dual quad core intel xeon, 32GB

>what OS/version are you running.

Red Hat 6.4, 2.6.32-279.14.1.el6.x86_64

>is there anything else running on the system?

nothing else, except the monitoring tools. 

>depending on what message size you are talking about, you are running close to 
>the max speed of a gig-E network, so small nuances at the network layer could 
>be 
>causing you problems. so let's stop looking at rsyslog for a little bit and 
>see 
>what your machine is able to do in terms of just receiving UDP packets from 
>the 
>network

I am sending at 250,000 eps/mps which is roughly 590Mbits

The reason that I was confused, was because with the tcpdump command that I was 
running, I saw alot of "packets dropped by kernel" so that raised a flag for 
me, so I noticed that I had maxed the capture byte size (65535bytes = 
21,804eps) so thats why I saw all of those drops. 

So after taking tcpdump out of the equation, I am monitoring the throughput 
with a cacti server, and locally with netstat -su -c, and iftop. and currently 
I set the spirent at 250,000 eps/mps and I am writing 250,000 logs/second. ( so 
I think its not dropping anything, at the moment) 

( this is with the currentl configuration (i.e stop filters, to local storage) 

Robert
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