Hi,
We are currently working on testing Linux network performance. We have two
Linux machines in our test setup. Machine1 is the attacker machine from which
we are sending SYN packets to Machine2 at a rate of 3million pps. We are able
to receive these packets on Machine2's external interface and forward them
through the internal interface without dropping any packets. So far no
problems. However, when we start another app that captures traffic on
Machine2's external interface using libpcap, the amount of traffic that is
forwarded drops significantly. Obviously, this second libpcap app becomes a
bottleneck. It can capture only about 800Kpps of traffic and only about 800Kpps
can be forwarded in this case. This drop in the amount of forwarded traffic is
not acceptable for us.
Is there any way we can overcome this problem? Are there any settings on Os,
ixgbe driver or libpcap that will allow us to forward all the traffic?
Both machines are running Linux kernel 3.15.
Thanks in advance.
Giray
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