On (2010-11-26 12:39 -0500), Valdis.Kletnieks@vt.edu wrote:
That's only half the calculation. The *other* half is if you have gear that has a packets-per-second issue - if you go to 9000 MTU, you can move 6 times as much data in the same packets-per-second. Anybody who's ever had to trim a complicated ACL list because it saturated the CPU knows what I mean.
Academically speaking interesting topic, of course the actual time to copy the packet is not constant, so you are not going to see linear increase in bandwidth. It would be very nice to see graph of say VXR with long enough ACL to cap 1500B rate very low and then see results of different packet sizes of 3000, 6000, 9000. If this is something you regularly need to operationally consider, do you happen to have such numbers and if not would it be too much of work for you to provide the numbers? In my world, we've been running hardware lookup engines since 2003, so we really don't need to care about features affecting lookup speed. -- ++ytti