On Thu, 2007-10-05 at 19:48 +0400, Evgeniy Polyakov wrote: > IMHO if you do not see in profile anything related to driver's xmit > function, it does not require to be fixed.
True, but i think there may be value in amortizing the cost towards the driver. i.e If you grab a lock and send X packets vs a single packet, depending on the cost of the lock you may observe a reduction in CPU. I have tried similar experiments in the past and observed zero improvements in sane machines, but huge improvements on insane machines. Slides on my work here (just jump to about slide 93): http://vger.kernel.org/jamal_netconf2006.sxi One thought i had at the time was perhaps the e1000 DMA setup/teardown was very inefficient. As the slides indicate i was trying to get throughput improvements but failed to seen any on sane machines. A suggestion made to me was to look at CPU utilization as a metric. Unfortunately i havent had any chance yet. cheers, jamal - 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
