From: Shirley Ma <[EMAIL PROTECTED]> Date: Tue, 15 May 2007 14:22:57 -0700
> I just wonder without TSO support in HW, how much benefit we > can get by pushing GSO from interface layer to device layer besides > we can do multiple packets in IPoIB. I bet the gain is non-trivial. I'd say about half of the gain from TSO comes from only calling down into the driver from TCP one time as opposed to N times. That's the majority of the "CPU work" involved in TCP sending. The rest of the gain comes from only transmitting the packet headers once rather than N times, which conserves I/O bus bandwidth. GSO will not help the case of lots of UDP applications sending small packets, or something like that. An efficient qdisc-->driver transfer during netif_wake_queue() could help solve some of that, as is being discussed here. - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
