Re: [PATCH v2 net-next] net: snmp: add statistics for tcp small queue check

[Eric Dumazet]

On Mon, Nov 29, 2021 at 7:57 AM Jakub Kicinski <kuba@xxxxxxxxxx> wrote:
>
> On Sun, 28 Nov 2021 14:01:02 +0800 menglong8.dong@xxxxxxxxx wrote:
> > Once tcp small queue check failed in tcp_small_queue_check(), the
> > throughput of tcp will be limited, and it's hard to distinguish
> > whether it is out of tcp congestion control.
> >
> > Add statistics of LINUX_MIB_TCPSMALLQUEUEFAILURE for this scene.
>
> Isn't this going to trigger all the time and alarm users because of the
> "Failure" in the TCPSmallQueueFailure name?  Isn't it perfectly fine
> for TCP to bake full TSQ amount of data and have it paced out onto the
> wire? What's your link speed?

Yes, I would be curious to have some instructions on how this new SNMP
variable can be used,
in a concrete case.

Like, how getting these SNMP values can translate to an action, giving
more throughput ?