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

Chas Williams (CONTRACTOR) chas at cmf.nrl.navy.mil
Thu Jun 5 07:06:25 PDT 2008


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).



More information about the ewg mailing list