[ewg] Re: [ofa-general] Re: [PATCH] IB/ipoib: increase ring sizes

[Chas Williams (CONTRACTOR)]

In message <1212654037.31801.13.camel at mtls03>,Eli Cohen writes:
>Increase IPoIB ring sizes to twice the original size to act as
>a shock absorber for high traffic picks. With the current settings, we
>have seen cases that there are many calls to
>netif_stop_queue()/netif_wake_queue(). This causes degradation in

with a tx ring size of 64, and datagram mode, the 'window size' you will
get is approximately 64*1500, or 96k.  using the bandwidth delay product,
this implies that your interhost delay should be about .096ms to get full
rate with tcp (ignoring the basic problems with UD mode).