[DRBD-user] Jumbo Frames

P.V.Anthony pvantony at singnet.com.sg
Wed Nov 10 14:16:48 CET 2004

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

David wrote:
> On Tue, 9 Nov 2004 11:53:51 +0100, Philipp Reisner
> <philipp.reisner at linbit.com> wrote:
>>I always use jumbo frames on the interconnecting network
>>for DRBD. I have never tried to measure the difference
>>betrwenn 1500 Byte frames and the big ones...
> I have a cluster not in production (testing in my lab) that I can try
> this on tomorrow or this weekend sometime.
> Any recommendations besides tiobench?
> I've been hammering two dell 2850's with U320 15K RPM drives using
> sql-bench/run-all-tests and tiobench for the last few days.
> Everything seems solid as a rock so far but I haven't started yanking
> plugs or failing drives. <grin>
> While I've got it all setup, I'm happy to run tests people need or
> would like...now is the time to ask for them.
> thanks,
> david

I think you will not get a speed increase because of the hard disk. To 
get get more, I think you will have to add more drives and stripe them. 
Then we should see a speed increase with the jumbo frames.

Having said that, the most important factor is that, with jumbo frames 
we use less cycles from the cpu. So more cycles for other apps. That is 
just great for me.


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