netdev - Re: TCP stops sending packets over loopback on 4.10-rc3?

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Message-ID: <1485355199.5145.14.camel@edumazet-glaptop3.roam.corp.google.com>
Date:   Wed, 25 Jan 2017 06:39:59 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Josef Bacik <jbacik@...com>
Cc:     Linux Netdev List <netdev@...r.kernel.org>,
        Lawrence Brakmo <brakmo@...com>,
        Kernel Team <kernel-team@...com>
Subject: Re: TCP stops sending packets over loopback on 4.10-rc3?

On Wed, 2017-01-25 at 09:26 -0500, Josef Bacik wrote:

> Nope ftrace isn't broken, I'm just dumb, the space is being reclaimed 
> by sk_wmem_free_skb().  So I guess I need to figure out why I stop 
> getting ACK's from the other side of the loopback.  Thanks,

ss -temoi dst 127.0.0.1

Might give you some hints, like packets being dropped.

ACK can be delayed if the reader is slow to consume bytes.