On 4/16/2014 9:21 PM, Chuck Lever wrote:
Passing a small array to ip_poll_cq() is actually easy to do, and is
exactly equivalent to a poll budget. The struct ib_wc should be taken
off the stack anyway, IMO.
The only other example I see in 3.15 right now is IPoIB, which seems
to do exactly this.
I’m testing a patch now. I’d like to start simple and make it more
complex only if we need to.
What array size are you using? Note that if you use a small array it may
be an overkill since
a lot more interrupts are invoked (-> more latency). I found that for a
high workload a budget
of 256/512/1024 keeps fairness and doesn't increase latency.
Regardless, doing array-polling is a nice optimization reducing CQ
entrances.
Sagi.
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