Re: Problematic throughput numbers

[David Gibson <david@gibson.dropbear.id.au>]

[-- Attachment #1: Type: text/plain, Size: 1308 bytes --]

On Thu, Sep 26, 2024 at 05:45:52AM +0200, Stefano Brivio wrote:
> On Thu, 26 Sep 2024 11:59:17 +1000
> David Gibson <david@gibson.dropbear.id.au> wrote:
> 
> > On Wed, Sep 25, 2024 at 12:36:43PM -0400, Jon Maloy wrote:
> > > I made many runs with iperf3 ns->host, and the results are puzzling me.
> > > Over and over again, I see throughput practically collapse, with a two
> > > orders of magnitude decrease.
> > > Just to make sure this wasn't something introduced by me, I went back to the
> > > master branch and disabled the SO_PEEK_OFF feature.
> > > The result was the same.
> > > The below log shows typical run, but it is highly variable.
> > > Sometimes almost the whole series is in the 50-70 Gb/s range, and sometimes
> > > almost all in the 100-300 Mb/s range.
> > > When I added the kernel fix it didn't seem to make any difference.
> > > 
> > > To me this is really worrying, and should be investigated.  
> > 
> > Those numbers are certainly worrying.  Like Stefano, though, I have
> 
> ...not...?

Oops, yes, that's what I meant.

> 
> > encountered this myself.
> 

-- 
David Gibson (he or they)	| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you, not the other way
				| around.
http://www.ozlabs.org/~dgibson

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 833 bytes --]