Messages in this thread | | | Date | Mon, 20 Mar 2006 10:09:42 -0500 | From | Benjamin LaHaise <> | Subject | Re: TSO and IPoIB performance degradation |
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On Mon, Mar 20, 2006 at 02:04:07PM +0200, Michael S. Tsirkin wrote: > does not stretch ACKs anymore. RFC 2581 does mention that it might be OK to > stretch ACKs "after careful consideration", and we are seeing that it helps > IP over InfiniBand, so recent Linux kernels perform worse in that respect. > > And since there does not seem to be a way to figure it out automagically when > doing this is a good idea, I proposed adding some kind of knob that will let the > user apply the consideration for us.
Wouldn't it make sense to strech the ACK when the previous ACK is still in the TX queue of the device? I know that sort of behaviour was always an issue on modem links where you don't want to send out redundant ACKs.
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