Re: Why is my gigabit ethernet so slow?

[Steven Bellovin <smb%cs.columbia.edu@localhost>]

On Jan 27, 2010, at 1:48 PM, Thor Lancelot Simon wrote:

> On Wed, Jan 27, 2010 at 02:44:29PM +0200, Martti Kuparinen wrote:
>> 
>> I found http://proj.sunet.se/E2E/tcptune.html and played a little with 
>> the receiver (NetBSD 5.99.24), below 3 runs with both settings. The 
>> conclusion is that I'm happy now as I'm able to route 850+ Mbps through 
>> my router...
> 
> Changing the initial window is highly antisocial.  It's certainly not
> good general-purpose advice for tuning TCP stacks and it's probably not
> necessary to get the throughput you're looking for.
> 

Indeed -- doing that is considered *very* rude by the network performance 
community.  The more interesting question is the maximum window size.


                --Steve Bellovin, http://www.cs.columbia.edu/~smb