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[sonci]

Hi,
I noticed that when I enable jumbo frame support on DNS323 to 9000, the tranfer speed drop from 16mb/s to 10, I use a gigabit network and jumbo frame 9000, is enabled on all devices.. ops escept my adsl modem router

Should we enble or not jumbo frame on DNS?

[AKFubar]

Please read this it will help you decide:

http://www.tomshardware.com/reviews/gigabit-ethernet-bandwidth,2321.html

[gunrunnerjohn]

Are you SURE that all the switches between the units support jumbo frames?  This sounds like you have a switch that doesn't support them, so there are retransmissions that slow things down.

[Tank_Killer]

sometimes max jumbo frames is not ideal in every situation.  With receive side scaling ect, clients can handle large frames with varying results.  As gunner suggested double check your hardware supports jumbo frames, as well make sure they support 9k jumbo frames.  You might find one of your devices only supports say 4k jumbo frames.

That being said you need to experiment, i have seen setups where 4k frames yields better performance than 9k (even tho all hardware supports 9k).  So play around with your setup a little and get whats right for your topography.

[gunrunnerjohn]

I'm currently using 4k jumbo frames for that reason.  They seemed better than the 9k settings.

[fordem]

I use 9K - that works best for me - the reason why I mention this is to highlight the need for each user to test their network, because the best settings will differ from one network to the next.

Something worth noting also, is that the "best setting" is also dictated by the nature of the data being used, if you're testing with large files (which is really where jumbo frame makes sense), but the normal day to day data is smaller files, you could be "shooting yourself in the foot"

[gunrunnerjohn]

I did my testing with the actual files I was going to be using, they range from small to multi-gigabyte backup images.  That's why I said it worked best for me.