Re: AMD EPYC virtual network performances

[Jürgen Groß <jgross@xxxxxxxx>]

On 14.08.24 22:26, Elliott Mitchell wrote:
> On Wed, Aug 14, 2024 at 08:15:38AM +0200, Jürgen Groß wrote:
> > On 14.08.24 00:36, Elliott Mitchell wrote:
> > > On Tue, Aug 13, 2024 at 08:55:42PM +0200, Jürgen Groß wrote:
> > > > On 13.08.24 19:49, Elliott Mitchell wrote:
> > > > > There is a possibility spurious interrupts are being turned into spurious
> > > > > events by the back-end drivers.
> > > > No, I don't think so.
> > > >
> > > > > Jürgen Groß, what is the performance impact of "iommu=debug"?  Seems to
> > > > > mostly cause more reporting and have minimal/no performance effect.
> > > > I guess you are referring to the Xen option? I'm no expert in this
> > > > area.
> > > Drat.  I haven't noticed much, which would match with simply enabling a
> > > bunch of debugging printk()s (alas I'm not monitoring performance closely
> > > enough to be sure).  Guess I wait for Andrei Semenov to state a comfort
> > > level with trying "iommu=debug".
> > You didn't answer my question.
> I guess I did not explicitly do so.  I was referring to the Xen
> command-line option.
And again you didn't supply the information I asked for (command line
options of Xen and dom0).

Did you consider that asking for help while not supplying data which has
been asked for is going to result in no help at all? You are wasting the
time of volunteers, which will reduce the motivation to look into your
issue a lot.

That said, I won't look into your problems any longer, as I have a job
to do and I can spend my time much better than trying to help someone who
isn't willing to answer even the simplest questions.


Juergen