Re: Network speed Linux-2.6.10

[Baruch Even]

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.

Baruch
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/