Messages in this thread | | | Date | Mon, 20 Mar 2006 12:22:34 +0200 | From | "Michael S. Tsirkin" <> | Subject | Re: TSO and IPoIB performance degradation |
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Quoting r. David S. Miller <davem@davemloft.net>: > The path an SKB can take is opaque and unknown until the very last > moment it is actually given to the device transmit function.
Why, I was proposing looking at dst cache. If that's NULL, well, we won't stretch ACKs. Worst case we apply the wrong optimization. Right?
> People need to get the "special case this topology" ideas out of their > heads. :-)
Okay, I get that.
What I'd like to clarify, however: rfc2581 explicitly states that in some cases it might be OK to generate ACKs less frequently than every second full-sized segment. Given Matt's measurements, TCP on top of IP over InfiniBand on Linux seems to hit one of these cases. Do you agree to that?
-- Michael S. Tsirkin Staff Engineer, Mellanox Technologies - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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