Re: Why is my gigabit ethernet so slow?

[Thor Lancelot Simon <tls%panix.com@localhost>]

On Tue, Jan 26, 2010 at 05:08:57PM +0200, Martti Kuparinen wrote:
>
> Is there anything else I can tweak to improve the throughput when routing 
> traffic between interfaces?

Are you sure the router can sustain more than 1Gbit/sec, regardless of
what the client and server routing across it are?  450Mbit/sec across
the router is about 900Mbit/sec of work total (of course the router does
not have to do TCP).

Do be sure IP checksum offload is enabled on the router's interfaces.

The only driver option you may have missed on the clients is segmentation
offload: "tso4" and "tso6" for TCP on v4 and v6 respectively.  But that
will probably not change anything here.

-- 
Thor Lancelot Simon                                    
tls%rek.tjls.com@localhost
  "All of my opinions are consistent, but I cannot present them all
   at once."    -Jean-Jacques Rousseau, On The Social Contract