netdev - Re: [PATCH net-next 3/5] selftests: drv-net: rss_ctx: test queue changes vs user RSS config

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Message-ID: <668c1a2168f55_1960bd29446@willemb.c.googlers.com.notmuch>
Date: Mon, 08 Jul 2024 12:56:01 -0400
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: Jakub Kicinski <kuba@...nel.org>, 
 Willem de Bruijn <willemdebruijn.kernel@...il.com>
Cc: davem@...emloft.net, 
 netdev@...r.kernel.org, 
 edumazet@...gle.com, 
 pabeni@...hat.com, 
 petrm@...dia.com, 
 przemyslaw.kitszel@...el.com, 
 ecree.xilinx@...il.com
Subject: Re: [PATCH net-next 3/5] selftests: drv-net: rss_ctx: test queue
 changes vs user RSS config

Jakub Kicinski wrote:
> On Sat, 06 Jul 2024 10:00:58 -0400 Willem de Bruijn wrote:
> > > +    _send_traffic_check(cfg, port, ctx_ref, { 'target': (0, 3),
> > > +                                              other_key: (1, 2) })  
> > 
> > How come queues missing from the indir set in non-main context are not
> > empty (but noise)?
> 
> There may be background noise traffic on the main context.
> If we are running iperf to the main context the noise will just add up
> to the iperf traffic and all other queues should be completely idle.
> If we're testing additional context we'll get only iperf traffic on
> the target context, and all non-iperf noise stays on main context
> (hence noise rather than empty)

That makes sense. Should the following be inverted then?

+    if main_ctx:
+        other_key = 'empty'
+        defer(ethtool, f"-X {cfg.ifname} default")
+    else:
+        other_key = 'noise'