slowdowns with MTU > 8k

Greg Dickie greg at
Thu Jul 26 12:08:23 GMT 2001

Well I guess that would make some sense wouldn't it ;-). I did some further
testing and it "appears" to be related to sendfile. I'll use some ethereal
technology to see if I can see something bizarre. 

Thanks for the suggestion,

On 25-Jul-01 Jeremy Allison wrote:
> Greg Dickie wrote:
>> 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?
> Capture traces so we can see what's going on ?
> Jeremy.
> -- 
> --------------------------------------------------------
> Buying an operating system without source is like buying
> a self-assembly Space Shuttle with no instructions.
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Greg Dickie
just a guy
greg at

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