If memory serves me right, Matthew Dillon wrote:
>     I've noticed that -current has much lower TCP performance.  I haven't
>     had time to investigate it but I presume there is some overhead
>     somewhere that is killing it.

Here's a data point but I'm not sure how useful it is.  At the start of
December I was using tcpreplay to spew packets from a stored trace into
a testbed network as fast as the CPU could go, and I saw:

5-CURRENT (11/19):              9244 pps, 35.6 Mbps
4-STABLE (late November):       21827 pps, 84 Mbps

These measurements were on the same machine, which is a 1.7 GHz P4,
512MB RAM, ATA disk.  Network interface was a four-port dc-type card.
GENERIC kernels.  These are "typical" numbers, but fairly repeatable 
over various trace files I was using.

At the time I was more interested in being able to get packets on the
network quickly than in why there was a performance difference, so I
just plopped 4-STABLE on the machine without doing any other


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