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

Sagi Grimberg
2025-01-31T08:09:17Z

On 31/01/2025 9:29, Christoph Hellwig wrote:
> On Thu, Jan 30, 2025 at 04:25:35PM +0100, Daniel Wagner wrote:
>> 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.
> I'm fine with the rate limiting. I was just wondering if there is
> a case where we'd easily hit it and could do even better.

I agree with the change. The reason why I think its useful to keep is
because its
has been really useful indication when debugging UAF panics.