Maximum NIC interrupts

Jordi Espasa Clofent jordi.espasa at
Tue Dec 25 04:44:15 PST 2007

Hi all,

I know how to monitoring the NIC IRQ's consume, with tools as vmstat (-i 
flag), systat (-vm 1) or netstat (-m, -i), but I don't know how to 
determine the maximum interrupts that these NICs can give.

I've several SuperMicro servers with Intel Pro 1000 PT NICs, which are 
controlled by em(4) driver. I've done some performance tests (with tools 
as iperf or netperf) with great results, but I don't know exactly the 
hardware limits, because I don't know the maximum IRQ rate.

Obviously, before post this present message I've read a lot of 
documentation provided by vendor (Intel in this case) but I've not found it.

Jordi Espasa Clofent

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