linux-kernel - Re: [PATCH 1/3] nvme-tcp: rate limit error message in send path

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Message-ID: <216ab5ef-1c8b-4f3e-8a1a-f11e28994620@flourine.local>
Date: Thu, 30 Jan 2025 16:25:35 +0100
From: Daniel Wagner <dwagner@...e.de>
To: Christoph Hellwig <hch@....de>
Cc: Daniel Wagner <wagi@...nel.org>, Keith Busch <kbusch@...nel.org>, 
	Jens Axboe <axboe@...nel.dk>, Sagi Grimberg <sagi@...mberg.me>, Ming Lei <ming.lei@...hat.com>, 
	James Smart <james.smart@...adcom.com>, Hannes Reinecke <hare@...e.de>, linux-nvme@...ts.infradead.org, 
	linux-kernel@...r.kernel.org, linux-block@...r.kernel.org
Subject: Re: [PATCH 1/3] nvme-tcp: rate limit error message in send path

On Wed, Jan 29, 2025 at 07:05:34AM +0100, Christoph Hellwig wrote:
> On Tue, Jan 28, 2025 at 05:34:46PM +0100, Daniel Wagner wrote:
> > If a lot of request are in the queue, this message is spamming the logs,
> > thus rate limit it.
> 
> Are in the queue when what happens?  Not that I'm against this,
> but if we have a known condition where this error is printed a lot
> we should probably skip it entirely for that?

The condition is that all the elements in the queue->send_list could fail as a
batch. I had a bug in my patches which re-queued all the failed command
immediately and semd them out again, thus spamming the log.

This behavior doesn't exist in upstream. I just thought it might make
sense to rate limit as precaution. I don't know if it is worth the code
churn.