netdev - Re: [PATCH net-next -v6] net: enable timestamp static key if CPU isolation is configured

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Message-ID: <6605b15094f38_2b8cd6294f5@willemb.c.googlers.com.notmuch>
Date: Thu, 28 Mar 2024 14:05:04 -0400
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: Marcelo Tosatti <mtosatti@...hat.com>, 
 netdev@...r.kernel.org
Cc: Willem de Bruijn <willemdebruijn.kernel@...il.com>, 
 Jakub Kicinski <kuba@...nel.org>, 
 Eric Dumazet <edumazet@...gle.com>, 
 Frederic Weisbecker <frederic@...nel.org>, 
 Valentin Schneider <vschneid@...hat.com>, 
 Paolo Abeni <pabeni@...hat.com>
Subject: Re: [PATCH net-next -v6] net: enable timestamp static key if CPU
 isolation is configured

Marcelo Tosatti wrote:
> 
> For systems that use CPU isolation (via nohz_full), creating or destroying
> a socket with SO_TIMESTAMP, SO_TIMESTAMPNS or SO_TIMESTAMPING with flag
> SOF_TIMESTAMPING_RX_SOFTWARE will cause a static key to be enabled/disabled.
> This in turn causes undesired IPIs to isolated CPUs.
> 
> So enable the static key unconditionally, if CPU isolation is enabled,
> thus avoiding the IPIs.
> 
> Signed-off-by: Marcelo Tosatti <mtosatti@...hat.com>

Reviewed-by: Willem de Bruijn <willemb@...gle.com>