netdev - Regarding bottlenecks for high speed packet generation

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Date:	Thu, 25 Oct 2012 23:16:56 +0530
From:	Ajith Adapa <adapa.ajith@...il.com>
To:	netdev@...r.kernel.org
Subject: Regarding bottlenecks for high speed packet generation

Hi,

I am trying out a sample application written based on packet_mmap to
generate packets at line rates. I am using 3.4.10 kernel and a gigabit
nic card.
I have found some strange issues as mentioned below.

When I am transmitting packets sized 1500 bytes the socket buffers are
easily filled up eventhough if I increase the value of wmem_default
and wmem_max.
The memory I have allotted can fit around 14k packets of 1500 bytes
size. Is the NIC card not able to transmit them ?? How can I check it
??
I have even increased the Hardware tx queue size of NIC card from 256
to 4096 using ethtool.

Does traffic control causing any issue as I read it wont allow traffic bursts ?

Is there any way to find the major bottlenecks that would really cause
problems in high-speed packet generation.

Regards,
Ajith
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