Re: vhost-kernel net on pasta: from 26 to 37Gbit/s

[Stefano Brivio <sbrivio@redhat.com>]

On Wed, 11 Jun 2025 09:04:57 +0200
Eugenio Perez Martin <eperezma@redhat.com> wrote:

> On Tue, Jun 10, 2025 at 5:29 PM Stefano Brivio <sbrivio@redhat.com> wrote:
> >
> > On Mon, 9 Jun 2025 11:59:21 +0200
> > Eugenio Perez Martin <eperezma@redhat.com> wrote:
> >  
> > > Getting a table like [1] would give us light about this, especially if
> > > it is just a matter of running "make performance" or similar. Maybe we
> > > need to include longer queues? Focus on a given scenario? UDP goes
> > > better but TCP?  
> >
> > Well, it's a matter of running ./run under tests (or 'make' there).
> > Have you tried that with your patch? It's kind of representative in the
> > sense that it uses several message sizes and different values for the
> > sending window.
> 
> Yes but it freezes in my env.
> 
> Copying the different windows, top-left:
> # tail -f --retry /home/passt/test/test_logs/context_unshare.log
> /home/passt/test/test_logs/context_ns.log
> tail: warning: --retry only effective for the initial open
> ==> /home/passt/test/test_logs/context_unshare.log <==  
> unshare$ tail: cannot open '/home/passt/test/test_logs/context_ns.log'
> for reading: No such file or directory
>
> [...]
>
> === build/cppcheck
> ...skipped.
> 
> 
> === build/clang_tidy
> ...skipped.
> ---

I guess you're missing some dependencies, nstool ('make assets', or
'make' under tests/), or similar.

There's a test/README.md file listing most dependencies and also
describing how to debug things, essentially:

  DEBUG=1 ./run

and have a look at script.log. Patches for whatever issue you
might be hitting in your setup are warmly welcome, of course. :)

-- 
Stefano