netdev - Re: [PATCH] inet: add bound ports statistic

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Message-Id: <20180228.223217.1178910703084049513.davem@davemloft.net>
Date:   Wed, 28 Feb 2018 22:32:17 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     eric.dumazet@...il.com
Cc:     stephen@...workplumber.org, netdev@...r.kernel.org,
        sthemmin@...rosoft.com
Subject: Re: [PATCH] inet: add bound ports statistic

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Wed, 28 Feb 2018 18:28:02 -0800

> How useful it is to report this information ?
> 
> Given REUSEADDR and REUSEPORT, I really wonder what can be derived from
> this counter.
> 
> It seems its semantic is weak.

To me none of this really matters.

What matters is that iproute2 reported this via slabinfo for longer
than a decade.

It broke recently when SLAB started merging caches just like SLUB
always did.

So alternative to Stephen's patch is turning off SLAB cache merging
for certain networking caches, which is definitely a non-starter.

I have directed Stephen to handle the situation in this way.