Re: [lwip-users] Re: Try to Increase Jumbo Packet size beyond 9K

[Rishi Khan]

I guess it depends what speed you are trying to get with which packet  
sizes. With 1500 MTU, it's very hard to get 1Gbps with max window  
size of 65535. It may be possible with larger MTUs. However, linux  
and windows both negotiate window scaling to increase throughput.

Rishi

On Oct 15, 2008, at 10:52 AM, Gary Olson wrote:

> Hi,
>
>   I asked the Xilinx Forum about increasing packets above 9K and  
> was told that the TEMAC will not work above 9K.  I think the TEMAC
>
> Will stop working at 8192 since I have tried testing my software  
> above that number and cannot get it to work.
>
>
>
> How would I turn off CRC checking in LWIP.  I would like to see if  
> this will increase thruput.  I have right now set up checksum offload
>
> To the TEMAC.  It helped about 20%.
>
>
>
> Thank you Bill and Rishi for your input.
>
>
>
> Rishi,
>
> I don’t understand the changing Window solution you mentioned.  And  
> even though I looked at the code it seems very complicated to  
> change my tcp code.
>
> I am using Jumbo packets up to 8080 bytes and the Temac stops  
> working at 8192 bytes.  The Temac can’t expand receiving data very  
> much on the Xilinx Board.
>
>
>
> Thank You,
>
>   Gary Olson
>
>
>
>
>
>
>
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