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Network card capable of capturing a tonne of packets and not dropping them?

Edit: Our server is trying to capture packets at between 500-600Mb/s, but is dropping packets 'due to kernel'. Data is being written to SSDs, and isn't bottleneck there. What things should I look ...
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interrupt coalescing for high bandwidth packet capture?

I have an application which does packet capture from an ethernet card. Once in a while we see packets dropped (we suspect due to the buffer in the network card or kernel being overrun). I am trying ...