We only have jumbo frames enabled on router<->router links. The GigE ports facing the aggregation switches runs standard 1500 MTU. --- John Fraizer EnterZone, Inc On Wed, 25 Apr 2001, Paul Lantinga wrote:
well, actually, I haven't had any for, oh, 5 years. Anyhow, what I was getting at was what kind of price you pay performancewise for mtuX <--> mtuY? Isn't there some penalty you pay in the conversion of jumbo to normal?
Years ago I ran a network that was all fddi with 4k mtu in the core and to all the servers Everthing else ran ethernet and thus didn't get the advantage of the big packets.
-Paul.
April 26, 2001 9:29 AM John Fraizer wrote:
We only have jumbo frames enabled on router<->router links. The GigE ports facing the aggregation switches runs standard 1500 MTU.
Hence my original question. Packets across the GE will be 1500 unless you are packing them. April 25, 2001 8:10 PM John Fraizer wrote:
Partially because I can. Partially because there seems to be a performance increase when you start stuffing the pipe.
Assuming you are just passing the packets as received from the aggregation switch, this would only happen if your router hardware was better at managing jumbo buffer allocations than 1500B ones. Clearly it will waste large chunks of memory, so do you have measurements to show the actual performance increase? Tony
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