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Message-ID: <681a63e3c1a6c_18e44b2949d@willemb.c.googlers.com.notmuch>
Date: Tue, 06 May 2025 15:32:51 -0400
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: Jacob Keller <jacob.e.keller@...el.com>,
Andrew Lunn <andrew@...n.ch>,
Alexander Shalimov <alex-shalimov@...dex-team.ru>
Cc: netdev@...r.kernel.org,
linux-kernel@...r.kernel.org,
willemdebruijn.kernel@...il.com,
jasowang@...hat.com,
davem@...emloft.net,
edumazet@...gle.com,
kuba@...nel.org,
pabeni@...hat.com
Subject: Re: [PATCH] net/tun: expose queue utilization stats via ethtool
Jacob Keller wrote:
>
>
> On 5/6/2025 9:07 AM, Andrew Lunn wrote:
> > On Tue, May 06, 2025 at 06:41:17PM +0300, Alexander Shalimov wrote:
> >> This patch exposes per-queue utilization statistics via ethtool -S,
> >> allowing on-demand inspection of queue fill levels. Utilization metrics are
> >> captured at the time of the ethtool invocation, providing a snapshot useful
> >> for correlation with guest and host behavior.
> >
> > This does not fit the usual statistics pattern, which are simple
> > incremental counters. Are there any other drivers doing anything like
> > this?
> I don't recall ever seeing anything like this. If there are, I feel it
> is a mistake regardless, and we shouldn't repeat it without good reason.
>
> +1 to looking at another option for reporting.
Perhaps bpftrace with a kfunc at a suitable function entry point to
get access to these ring structures.
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