linux-kernel - Re: [PATCH] net/tun: expose queue utilization stats via ethtool

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Message-ID: <24a121fd-aa4d-43db-8c8c-477bca99a7ae@intel.com>
Date: Tue, 6 May 2025 12:00:12 -0700
From: Jacob Keller <jacob.e.keller@...el.com>
To: 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



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.