netdev - Re: [RFC net-next 1/1] : sctp: denoise deprecation log on SCTP

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Message-ID: <55AF86B2.1020001@iogearbox.net>
Date:	Wed, 22 Jul 2015 14:04:02 +0200
From:	Daniel Borkmann <daniel@...earbox.net>
To:	David Laight <David.Laight@...LAB.COM>
CC:	'Jamal Hadi Salim' <jhs@...atatu.com>,
	Neil Horman <nhorman@...driver.com>,
	Vlad Yasevich <vyasevic@...hat.com>,
	David Miller <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	tuexen@...muenster.de
Subject: Re: [RFC net-next 1/1] : sctp: denoise deprecation log on SCTP_EVENTS

On 07/22/2015 01:48 PM, David Laight wrote:
> From: Jamal Hadi Salim
>> Sent: 09 July 2015 11:38
>>
>> In the newer kernels this message is extremely noisy. After a quick
>> discussion with Daniel it seems to me it will be very hard to get
>> existing apps that nobody is going to update to continue to work
>> (i.e no forward compat). And newer apps that desire to play in both
>> older kernels and new kernels will have to play some tricks to work
>> (i.e weak backward compatibility).  These are good reasons
>> to totally get rid of this message. At minimal to neutre it.
>> The attached change tries to do that. However, if you had multiple
>> apps, you will only get warning for the first one.
>
> Never mind spanning the kernel log, there will be performance
> issues with systems that are sending significant amounts of SCTP data.
> I'm not sure you'll get 10000+/sec through the trace system.

What do you mean by "trace system" (there's no backtrace)?

Anyway, as previously stated, I doubt we'd get rid of the deprecated
SCTP uapi from the RFC any time soon, so, imho, we should just remove
these rate-limited messages altogether to stop spamming the klog ...

> I'm going to have to find which version this trace went into and
> make sure we tell customers not to use the relevant kernel versions.
>
> 	David
>

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