netdev - Re: [PATCH v2 net-next 0/2] tcp: final (?) round of mem pressure fixes

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Date:   Wed, 15 Jun 2022 23:07:17 -0700
From:   Eric Dumazet <edumazet@...gle.com>
To:     David Miller <davem@...emloft.net>
Cc:     Eric Dumazet <eric.dumazet@...il.com>,
        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 v2 net-next 0/2] tcp: final (?) round of mem pressure fixes

On Wed, Jun 15, 2022 at 11:00 PM Eric Dumazet <edumazet@...gle.com> wrote:
>
> On Wed, Jun 15, 2022 at 4:56 AM David Miller <davem@...emloft.net> wrote:
> >
> > From: Eric Dumazet <eric.dumazet@...il.com>
> > Date: Tue, 14 Jun 2022 10:17:32 -0700
> >
> > > 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.
> > >
> > > v2: deal with zerocopy tx paths.
> >
> > Does not apply cleanly to net, please respin.
> >
> > Thank you.
>
> I was targeting net-next tree for this old bug, and planning to
> prepare stable backports.

This was because in net-next we got rid of SK_MEM_QUANTUM, and to
limit merge conflicts.

>
> Tell me if you prefer to respin to net tree, probably later today
> because I am traveling.
>
> Thanks.