Thanks Dan.  I appreciate you hard work in continuing to research =)


Dan Otto wrote:

>Make sure all devices on the same Vlan supports jumbo frames or you can
>end up with a MTU miss-match which can cause your performance to be even
>worse. If you do not hit a layer three device you will not be able to
>use the Max path discovery feature built into IP. 
>
> 
>
>-----Original Message-----
>From: veritas-bu-admin AT mailman.eng.auburn DOT edu
>[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of Prashanth
>N
>Sent: Monday, February 14, 2005 3:28 AM
>To: Dale King
>Cc: veritas-bu AT mailman.eng.auburn DOT edu
>Subject: Re: [Veritas-bu] Gigabit performance
>
> 
>
>As Dale suggested,
>enable Jumbo frames on the interface and set the MTU size to 9000. THIS
>SHOULD GIVE you better performance
>
>Thank you
>Prashanth
>
>
>
>Dale King wrote: 
>
>On Thu, Feb 10, 2005 at 04:44:19PM -0500, Mosseveld, Adriaan wrote:
>  
>
>       Our Netbackup infrastructure is based around an E450 with
>gigabit
>       connectivity.
>        
>       For some reason, it is impossible for us to get a throughput on
>the (ge)
>       Gigabit card of greater than 10Mb/sec. We have tried a direct
>connection
>       between the server and an E220R with a ce gigaswift card, with
>exactly the
>       same results (therefore ruling out the switch).
>        
>       We have tried using Netbackup, ftp, dd (with remote shell), but
>all showed a
>       similar throughput.
>           
>
> 
>I think you need to look at tuning your TCP stack.  Look at your OS
>documentation for how to change your TCP send and receive buffers.  Also
>if your switches can support jumbo frames try turning that on.
> 
>A quick google search for gigabit ethernet tuning should turn up some
>useful information.
> 
>Regards,
>Dale
>_______________________________________________
>Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
>http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
> 
> 
>  
>
>
>
>
>
>
> 

-- 
Thanks.

---------------------------------
 Huong Lam                      
 myhuong.lam AT amd DOT com
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