[c-nsp] IPerf alternative

[Ryan Harden]

This looks like a CPU issue, not an iperf issue.

I would try running separate iperf3 processes and manually binding them to a CPU/core on each host.

Example for #2:
Host1: iperf3 -s -p 5000
Host1: iperf3 -s -p 5001
Host2: iperf3 -c host1 -p5000  -A0,0
Host2: iperf3 -c host1 -p5001 -A1,1 -R

Since you are able to get full line-rate in one direction, I suspect you don’t need to tweak TCP window sizes or frame/packet sizes.

/Ryan

Ryan Harden
Research and Advanced Networking Architect
University of Chicago - ASN160
P: 773.834.5441

> On Aug 9, 2017, at 4:51 AM, CiscoNSP List <CiscoNSP_list at hotmail.com> wrote:
> 
> Hi James - Yes I tested this also....it still will not go above 50%...at first I though it may be the carriers link, but I also tested the bidirectional/simultaneous test, and it produced similar results (Single direction test were fine.)  Single direction tests are fine.
> 
> 
> I think its a problem with IPerf, potentiallly the server nics...Or maybe IPerf is "limited" to the bandwith of the link (1G, but can only send/receive a "total" (50% in both directions)
> 
> There are a few reports of issues with the bidirectional tests, but I cant locate any "fixes".....so Id prefer to spend time looking at a more robust (proven) testing tool.
> 
> Cheers
> 
> ________________________________
> From: cisco-nsp <cisco-nsp-bounces at puck.nether.net> on behalf of James Bensley <jwbensley at gmail.com>
> Sent: Wednesday, 9 August 2017 5:47 PM
> To: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] IPerf alternative
> 
> On 9 August 2017 at 08:39, CiscoNSP List <CiscoNSP_list at hotmail.com> wrote:
>> Thanks Ryan - They did not include bidirectional simultaneous test in V3 I dont think? (this is a test we definitely require, and one that is causing us the most issues in v2 (It appears to be somewhat broken...perhaps that is what they dint include it in v3 ?
> 
> Run two copies simultaneously? That way you can also tweak the two
> unidirectional streams independently.
> 
> Cheers,
> James.
> _______________________________________________
> cisco-nsp mailing list  cisco-nsp at puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-nsp
> cisco-nsp Info Page - puck.nether.net<https://puck.nether.net/mailman/listinfo/cisco-nsp>
> puck.nether.net
> To see the collection of prior postings to the list, visit the cisco-nsp Archives. Using cisco-nsp: To post a message to all the list members, send ...
> 
> 
> 
> archive at http://puck.nether.net/pipermail/cisco-nsp/
> _______________________________________________
> cisco-nsp mailing list  cisco-nsp at puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-nsp
> archive at http://puck.nether.net/pipermail/cisco-nsp/

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 203 bytes
Desc: Message signed with OpenPGP
URL: <https://puck.nether.net/pipermail/cisco-nsp/attachments/20170810/21a8980a/attachment.sig>