Jumbo frame Question

Wil Schultz wschultz at bsdboy.com
Thu Nov 25 18:33:29 CST 2010


This helps tons. 

speedguide.net has some registry 'tweeks' for different versions of windows. 

Also Win7 had the ability to turn on a FASTTCP type of congestion management called Compound TCP. I haven't tried the windows version so ymmv, but I have experienced great success by changing the congestion avoidance algorithm on other devices. 

-wil

On Nov 25, 2010, at 4:19 PM, Adrian Chadd <adrian at creative.net.au> wrote:

> TCP maximum window sizes.
> 
> Application socket buffer sizes.
> 
> Fix those and re-test!
> 
> 
> 
> Adrian
> 
> On Fri, Nov 26, 2010, Harris Hui wrote:
>> 
>> 
>> Hi
>> 
>> Does anyone have experience on design / implementing the Jumbo frame
>> enabled network?
>> 
>> I am working on a project to better utilize a fiber link across east coast
>> and west coast with the Juniper devices.
>> 
>> Based on the default TCP windows in Linux / Windows and the latency between
>> east coast and west coast (~80ms) and the default MTU size 1500, the
>> maximum throughput of a single TCP session is around ~3Mbps but it is too
>> slow for us to backing-up the huge amount of data across 2 sites.
>> 
>> The following is the topology that we are using right now.
>> 
>> Host A NIC (MTU 9000) <--- GigLAN ---> (MTU 9216) Juniper EX4200 (MTU 9216)
>> <---GigLAN ---> (MTU 9018) J-6350 cluster A (MTU 9018) <--- fiber link
>> across site ---> (MTU 9018) J-6350 cluster B (MTU 9018) <--- GigLAN --->
>> (MTU 9216) Juniper EX4200 (MTU 9216) <---GigLAN ---> (MTU 9000) NIC - Host
>> B
>> 
>> I was trying to test the connectivity from Host A to the J-6350 cluster A
>> by using ICMP-Ping with size 8000 and DF bit set but it was failed to ping.
>> 
>> Does anyone have experience on it? please advise.
>> 
>> Thanks :-)
> -- 
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