Messages in this thread | | | Date | Wed, 02 Mar 2005 09:37:56 +0000 | From | Baruch Even <> | Subject | Re: Network speed Linux-2.6.10 |
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Paul Dickson wrote: > On Wed, 02 Mar 2005 01:02:50 +0000, Baruch Even wrote: > >>>Might this be related to the broken BicTCP implementations in the 2.6.6+ >>>kernels? A fix was added around 2.6.11-rc3 or 4. >> >>Unlikely, the problem with BIC would have shown itself only at high >>speeds over long latency links, not over a lan connection. > > I only mentioned the possibility because I saw the same profile given by > the PDF (the link was mentioned in the patch) while downloading gnoppix > via my cable modem. The oscillations of speed varied from 40K to 500+K. > The average ended up around 270K. (I was using wget for the download).
If it is indeed BIC than we have a bug where it doesn't shut itself off for low latencies. Since we don't test this case extensively here (we work to improve high-speed and just make sure we don't ruin slower speeds) I can't say it's impossible, try turning BIC off and see if it helps.
Due to the scenario that the OP gave it is more likely something to do with auto-detection somewhere along the way or a driver bug. It is also possible that I'm mistaken and it is BIC, never hurts to check.
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