From: DAUBIGNE Sebastien - BOR ( SDaubigne@bordeaux-bersol.sema.slb.com ) (SDaubigne@bordeaux-bersol.sema.slb.com)
Date: Tue Nov 25 2003 - 09:59:43 EST
Hi,
Basic question is : What effective throughput can I expect on a Gigabit
Ethernet link with UltraSparc-3 CPU, with or without Jumbo Frame support,
with or without multithreaded transfer ?
I ask this because with UltraSparc-2 CPU (E10K) and GE link (without Jumbo
Frame support) we couldn't get more than :
- 15 Mbytes/s with monothreaded transfer
- 55 Mbytes/s with multithreaded transfer (the best rate was reached
with 10 threads)
(We measured application throughput, that is to say TCP throughput).
As you see the CPU overhead with 1500 MTU was so high (truss showed 80%
kernel), that we had to multithread the transfer to reach the best
throughput (55 Mbytes/s).
Unfortunately we were far from the theoretical limit (100 Mbytes/s ?), even
if there were still CPU resources free (50%), and I can't determine if it
was caused by the small MTU, the poor US-2 throughput or both ?
I think that Jumbo Frame could increase the throughput and lower the CPU
overhead, but how much ?
Will the US-3 throughput help much ?
Is there any chance to reach the 100 Mbytes/s limit ?
Thanks for your feedback, I will summarize.
--- Sebastien DAUBIGNE sdaubigne@bordeaux-bersol.sema.slb.com <mailto:sdaubigne@bordeaux-bersol.sema.slb.com> - (+33)5.57.26.56.36 SchlumbergerSema - SGS/DWH/Pessac _______________________________________________ sunmanagers mailing list sunmanagers@sunmanagers.org http://www.sunmanagers.org/mailman/listinfo/sunmanagers
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