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SubjectRe: Today Linus redesigns the networking driver interface (was Re: tulip driver in ...)
   Date: Tue, 22 Sep 1998 09:23:29 -0700 (PDT)
From: Linus Torvalds <torvalds@transmeta.com>

(Aggregation tends to be bad for latency, which is why it's hard: there
needs to be some way for the interrupt handler to tell the system that "I
want bh's run _now_, because I got an important packet or I'm close to
filling up the queues").

I don't know if it's really worth pursuing, though.

This would be really nice for SLIP/PPP processing. We could have the
drivers only run the BH when a SLIP or PPP framing character was
processed. This gives us the benefits of aggregation without the
downside of latency, since we kick the BH at exactly the right time ---
when we've gotten a full packet worth of data, and can send it to the
network layer.

Furthermore, it shouldn't be that hard to have interrupt drivers return
a flag indicating whether BH's should run now or not. It's something
that would be really nice for 2.3.

- Ted

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