[openib-general] Re: Re: [PATCH] IPoIB splitting CQ, increase both send/recv poll NUM_WC & interval

[Michael S. Tsirkin]

Quoting r. Shirley Ma <xma at us.ibm.com>:
> > > So far work queue gives very consistent 15% througput increase in my
> > > local test with one dual core cpu over mthca.
> >
> > What happens to the CPU utilization? And latency?
> 
> The CPU utilization were doubled under one dual core cpu.
> Finally I found that's the problem tx_ring blocked the sender.
> 
> After I tune send/recv queues, I got more than double throughput for
> unidirectional netperf with 10-15% more cpu utilization.
> 
> I believe after I apply my other removing tx_ring patch, the performance
> would be better.

Need to also see what happens to latency. There should be some cost, hopefully
not too much.

-- 
MST