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Re: [perfsonar-user] periodicity in packet loss measurements.


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  • From: "Hagen, Skye ()" <>
  • To: "" <>, "" <>
  • Subject: Re: [perfsonar-user] periodicity in packet loss measurements.
  • Date: Tue, 10 Jan 2017 21:57:04 +0000
  • Accept-language: en-US
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I have a couple of question regarding using multiple NICs, and they aren’t answered on the Configuring a Host with Multiple Interfaces page.

 

I have a dual 10G Intel NIC (X520-DA2). Can I use both interfaces on the NIC, or should I be looking at two separate NIC cards? It is PCI Express 2.0, 5.0 GT/s lane x 8 lane. Is there are way to tell if both interfaces are capable of simultaneous 10G throughput, without moving the contention problem to the PCI bus?

 

Can I run bwctl on a 10G NIC, and owamp on a 1G NIC? Are the results comparable? Or, is the recommendation to keep all testing interfaces at the same speed?

 

Skye.

 

From: <> on behalf of Brian Tierney <>
Reply-To: "" <>
Date: Monday, January 9, 2017 at 7:36 AM
To: "" <>
Cc: "" <>, "" <>, "" <>
Subject: Re: [perfsonar-user] periodicity in packet loss measurements.

 

 

We've seen this on hosts where iperf3 and owamp are running on the same NIC, which looks to be the case on your host.

iperf3 can take over the NIC, and case local loss.

 

We recommend running iperf3 and owamp on separate NICs. (or separate hosts).

 

 

 

 

 

On Mon, Jan 9, 2017 at 2:17 AM, <> wrote:

We are seeing a regular packet loss on our hosts running latency measurements which occur around midnight ( effects the bin measurements between 2300 and 0100).

Analysis leads us to believe that this is a problem with the setup of our host rather than a network issue. ( happens on both IPv4 and separate ipv6 infrastructure. It effects  measurements  both LAN and WAN  measurements.)  The attached plots show some of the effected links.  (This signal was a lot clearer last week  buth we have had some extra packetloss  this week creating background losses to this signal.

Has anyone see a similar effect before?

Brian

 



 

--

Brian Tierney, http://www.es.net/tierney
Energy Sciences Network (ESnet), Berkeley National Lab
http://fasterdata.es.net


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