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  3. December 2018

Re: new Power9, going from 1G to 10G Enet...

Diego,
That's not what we were talking about. You said that everything else being
equal, 10Gb has more CPU overhead compared to 1Gb. Since 1Gb can't give
more than 1Gb throughput, we can asume that you mean equal load and that
means an underutilized 10Gb adapter has more CPU overhead than a 1Gb
adapter.
How did you arrive to this conclusion? We were not discussing how SEA or
other nic sharing technologies add overhead but an adapter to adapter
comparison.

Best Regards,

On Fri, Dec 28, 2018 at 12:26 PM Diego Kesselman <diegokesselman@xxxxxxxxx>
wrote:

You're right, you have CPU overhead on SEA and Etherchannel, and bandwidth
overhead on 10Gb attached to your IBMi.
In fact you get 5~7 Gb according to customer experience .

El 28 dic. 2018 09:17, "Roberto José Etcheverry Romero" <
yggdrasil.raiker@xxxxxxxxx> escribió:

Diego,
Where are you getting that fact from? 10Gb throughput has overhead. But I
haven't seen how a 10Gb link can consume additional CPU compared to the 1Gb
one.
That's comparing SEA to SEA. SR-IOV, vNIC or other technologies might have
overhead but related to the virtualization itself...


On Fri, Dec 28, 2018 at 11:03 AM Diego Kesselman <diegokesselman@xxxxxxxxx

wrote:


Remember: 10Gb puts some CPU overhead. Sometimes 1Gb x N adapters is
better
(+ CHGTCPA with 1 MB Send/Receive Buffer)

El vie., 28 de dic. de 2018 05:36, Jim Oberholtzer <
midrangel@xxxxxxxxxxxxxxxxx> escribió:

This is where Navigator is your real friend. You can simply bring up a
graph and see how much Ethernet you are using. I'll bet it's 15% or
below. Most folks way over estimate how much the line is doing.


--
Jim Oberholtzer
Agile Technology Architects

-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxx> On Behalf Of Joe
Pluta
Sent: Thursday, December 27, 2018 11:30 PM
To: midrange-l@xxxxxxxxxxxx
Subject: Re: new Power9, going from 1G to 10G Enet...

No, only theoretical calculation (moving x GB over z minutes). We've
gotten rid of most of those requirements. Now our only pipe issue is
offsite HA replication.


On 12/27/2018 9:07 PM, Rob Berendt wrote:
Have you actually measured that and found that the ethernet line was
nearing 100% utilization?


Rob Berendt


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