[openib-general] [PATCH/RFC 1/2] IB: Return "maybe_missed_event" hint from ib_req_notify_cq()

[Shirley Ma]

"Michael S. Tsirkin" <mst at mellanox.co.il> wrote on 10/19/2006 01:21:45 PM:

> Please also note that due to factors such as TCP window limits, TX on a
single
> socket is often stalled.  To really stress a connection and see benefit
from
> NAPI you should be running multiple socket streams in parallel:
> either just run multiple instances of netperf/netserver, or use iperf
with -P flag.

I used to get 7600Mb/s IPoIB one socket duplex throughput with my other
IPoIB patches on 2.6.5 kernel under certain configuration. Which makes me
believe we could gain close to link throughput with one UD QP. Now I
couldn't get it anymore on the new kernel. I was struggling with TCP window
limits on the new kernel. Do you have any hint?

thanks
Shirley Ma
IBM Linux Technology Center
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