Advice on a multithreaded netisr patch?

[Ivan Voras]

Robert Watson wrote:
> 
> On Sun, 5 Apr 2009, Ivan Voras wrote:
> 
>> I thought this has something to deal with NIC moderation (em) but
>> can't really explain it. The bad performance part (not the jump) is
>> also visible over the loopback interface.
> 
> FYI, if you want high performance, you really want a card supporting
> multiple input queues -- igb, cxgb, mxge, etc.  if_em-only cards are
> fundamentally less scalable in an SMP environment because they require
> input or output to occur only from one CPU at a time.

Makes sense, but on the other hand - I see people are routing at least
250,000 packets per seconds per direction with these cards, so they
probably aren't the bottleneck (pro/1000 pt on pci-e).

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