[RFC] HOWTO use NAPI to reduce TX interrupts
xma at us.ibm.com
Wed Aug 23 11:29:37 EST 2006
> > 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()
We are still comparing these two approaches IPoIB performance under
different configurations. Hopefully the performance work can be done soon.
So we can have some data to share.
IBM Linux Technology Center
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