On Fri, Sep 22, 2006 at 11:48:23PM +0100, Robert Watson wrote: > The impact of TSO is clearly dramatic, especially when combined with the > patch, but I'm a bit concerned by the drop in performance in the patched > non-TSO case. For network cards which will always have TSO enabled, this > isn't an issue, but do we see a similar affect for drivers without TSO? > What can we put this drop down to? We probably also need to make sure that any performance increase in TSO isn't due to us getting TCP congestion control wrong. I think in Linux they had problems when they first introduced TSO because TCP was advancing the congestion window by a TSO-sized chunk instead of a wire packet. OTOH, I think Andre and Drew's tests are low-latency, so congestion control isn't likely to be playing a big role, so the improvements are unlikely to be due to this. David.Received on Sat Sep 23 2006 - 05:38:38 UTC
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