lkml.org 
[lkml]   [2005]   [Mar]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Network speed Linux-2.6.10
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@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 14:10    [from the cache]
©2003-2011 Jasper Spaans