netdev - Re: [PATCH] tcp: add tsval and tsecr to TCP

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Message-ID: <d0b1f5b1-8182-a1d0-4abf-924a0f050393@gmail.com>
Date:   Wed, 2 Oct 2019 16:14:37 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     William Dauchy <wdauchy@...il.com>
Cc:     NETDEV <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH] tcp: add tsval and tsecr to TCP_INFO



On 10/2/19 3:54 PM, William Dauchy wrote:
> Hello Eric,
> 
> On Thu, Oct 3, 2019 at 12:33 AM Eric Dumazet <eric.dumazet@...il.com> wrote:
>> On 10/2/19 3:10 PM, William Dauchy wrote:
>> Reporting the last recorded values is really not good,
>> a packet capture will give you all this information in a non
>> racy way.
> 
> Thank you for your quick answer.
> In my use case I use it on a http server where I tag my requests with
> such informations coming from tcp, which later helps to diagnose some
> issues and create some useful metrics to give me a general signal.
> Does it still sound like an invalid use case?

I would rather use a new getsockopt() to fetch this specific data,
instead of making TCP_INFO bigger for everyone :/

ss command can dump millions of sockets in busy hosts, we need to be
careful of TCP_INFO size.