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I am running Debian Linux 6.0 (2.6.32-5-amd64). My network NICS are Intel 82580 Gigabit running with the IGB network driver version 3.3.6 (firmware version 3.2-9).

I tested the performance and I noticed massive packet drops.

My test is simple: tcpreplay a file to the IGB interface and run tcpdump on the other side to verify that all packets have arrived.

Even with small throughput I experience many drops.

I switched ports to an old e1000e driver, and everything worked like a charm.

I tried doing the following and i got the same results:

Downgraded the driver version installed the sorceforce igb driver installed PF_RING with igb support Played with snaplen, and buffering I upgraded the kernel version to the latest 3.2.5 from kernel.org

Does anyone have any idea how to fix this issue?

Thank You

ewwhite
  • 201,205
Dave Dimonds
  • 11

2 Answers2

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IGB Cards often work sluggish with their default IRQ assignment. You might want to set CPU affinity. Intel provides this document that guides through it.

juwi
  • 591
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Try compiling the newest Intel NIC driver as a kernel module and use that instead of the stocker. It has worked wonders for me.

Marcin
  • 2,541