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Message-ID: <CADAe=+KJ2QuL7ZdrfDWQe8R1vF_r_bu3QBS-5kwZBgQ21QTMtg@mail.gmail.com> 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 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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