RE: TCP speed

["Greg Joyce" <greg@gilhooley.com>]

> -----Original Message-----
> Our experience is the same. TCP is FAST.
>
> The only remaining trouble is memory copy from TCP buffers to application
> buffers.
> Unless handled properly this may slow you down considerably.
>
> Julo

I agree completely; TCP performs very well. With header prediction and
hardware checksum, the mainline data path can be very lean. As with any
software, the key to performance is often in the implementation.

There is no place in the TCP RFC that specifies that the data has to be
copied. I suggest that the data copies are just artifacts of implementation
and the sockets API. In fact, given the proper API there is no reason that
data can't be placed directly into user buffers.

Greg
--
Greg Joyce 				greg@ipperformance.com
VP Product Development
IP Performance			512-448-1879