netdev - Re: [PATCH net-next 0/2] tcp: final (?) round of mem pressure fixes

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Date:   Tue, 14 Jun 2022 09:50:15 -0700
From:   Eric Dumazet <edumazet@...gle.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        netdev <netdev@...r.kernel.org>,
        Soheil Hassas Yeganeh <soheil@...gle.com>,
        Wei Wang <weiwan@...gle.com>,
        Shakeel Butt <shakeelb@...gle.com>,
        Neal Cardwell <ncardwell@...gle.com>
Subject: Re: [PATCH net-next 0/2] tcp: final (?) round of mem pressure fixes

On Tue, Jun 14, 2022 at 9:30 AM Eric Dumazet <eric.dumazet@...il.com> wrote:
>
> From: Eric Dumazet <edumazet@...gle.com>
>
> While working on prior patch series (e10b02ee5b6c "Merge branch
> 'net-reduce-tcp_memory_allocated-inflation'"), I found that we
> could still have frozen TCP flows under memory pressure.
>
> I thought we had solved this in 2015, but the fix was not complete.
>

I will send a V2, because we need to deal with tx zero copy paths.

> Eric Dumazet (2):
>   tcp: fix over estimation in sk_forced_mem_schedule()
>   tcp: fix possible freeze in tx path under memory pressure
>
>  net/ipv4/tcp.c        | 18 ++++++++++++++++--
>  net/ipv4/tcp_output.c |  7 ++++---
>  2 files changed, 20 insertions(+), 5 deletions(-)
>
> --
> 2.36.1.476.g0c4daa206d-goog
>