slowdowns with MTU > 8k

Christopher R. Hertel crh at
Wed Jul 25 14:37:04 GMT 2001

Is it just Samba?

I'm wondering if some device (your GIGE interface card, some intermediate 
switch, something) has a lower limit and could be splitting your packets 
in half on you.  That would slow things down a bit.

Chris -)-----

> Hi,
>   We are playing with gigabit ethernet and we get quite good performance
> when the MTU is set around 8k. If we set it at 9014 (max MTU on the switch
> we use) the throughput from samba gets cut in half. Tried playing with
> "max xmit" but no effect.
>   Anyone have any ideas what the problem could be or have any tools to
> dump the profile shared memory?
> Thanks,
> Greg
> ---------------------------------------------------------------------
> Greg Dickie
> just a guy
> greg at

Christopher R. Hertel -)-----                   University of Minnesota
crh at              Networking and Telecommunications Services

    Ideals are like stars; you will not succeed in touching them
    with your choose them as your guides, and following
    them you will reach your destiny.  --Carl Schultz

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