netdev - RACK not getting disabled

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Message-ID: <20170918201428.GB28186@strugglingcoder.info>
Date:   Mon, 18 Sep 2017 13:14:28 -0700
From:   hiren panchasara <hiren@...ugglingcoder.info>
To:     netdev@...r.kernel.org
Subject: RACK not getting disabled

Hi all, I am trying to disable rack to see 3dupacks in action during
loss-detection but based on the pcap, I see that it's still trigger
loss-recovery on the first SACK (as if RACK is still enabled/active).

Here is what I did to disable rack:
net.ipv4.tcp_recovery = 0

I've also disabled metrics:
net.ipv4.tcp_no_metrics_save = 1 
And also flushed existing entries with 'ip tcp_metrics flush' just to be
on a safer side.

Not really relevant here but I've also switched to reno.

I am on: 4.10.0-33-generic
pcap: https://transfer.sh/mfoiN/reno_no_rack.pcap

What am I missing? I can provide any additional info.

Cheers,
Hiren

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