Re: [RFC] HOWTO use NAPI to reduce TX interrupts

From: Roland Dreier <redacted>
Date: Mon, 21 Aug 2006 17:29:05 -0700

This is a digression from spidernet, but what if a device is able to
generate separate MSIs for TX and RX?  Some people from IBM have
suggested that it is beneficial for throughput to handle TX work and
RX work for IP-over-InfiniBand in parallel on separate CPUs, and
handling everything through the ->poll() method would defeat this.

The TX work is so incredibly cheap, relatively speaking, compared
to the full input packet processing path that the RX side runs
that I see no real benefit.

In fact, you might even get better locality due to the way the
locking can be performed if TX reclaim runs inside of ->poll()