Luigi Rizzo writes: > On Fri, Sep 05, 2003 at 04:47:22PM -0400, Andrew Gallatin wrote: > > > > I've been reading a little about TCP Segmentation Offload (aka TSO). > > We don't appear to support it, but at least 2 of our supported nics > > (e1000 and bge) apparently could support it. > > i believe there is more commercial hype than actual savings in doing > TCP Segmentation Offload. > > With delayed acks (or better, "ack every second packet"), > the sender's TCP typically sends out two > packets at a time. Without delayed acks, it is just one at a > time. So yes, you avoid looping in tcp_output() twice, but
I think that the loop in tcp_output() is not such a big deal. IMHO, the bigger savings is from not making extra trips through the driver, and from allowing the adapter to perform a smaller number of large DMAs. Naturally, this is all just speculation until there's an actual implementation which can be profiled ;) Drew _______________________________________________ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "[EMAIL PROTECTED]"
