netdev - Re: [PATCH net-next 0/2] tcp: add sysctl_tcp_rto_min

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Date: Wed, 29 May 2024 14:59:44 +0800
From: Jason Xing <kerneljasonxing@...il.com>
To: Kevin Yang <yyd@...gle.com>, Paolo Abeni <pabeni@...hat.com>
Cc: David Miller <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org
Subject: Re: [PATCH net-next 0/2] tcp: add sysctl_tcp_rto_min_us

On Wed, May 29, 2024 at 2:43 PM Jason Xing <kerneljasonxing@...il.com> wrote:
>
> Hello Kevin,
>
> On Wed, May 29, 2024 at 1:13 AM Kevin Yang <yyd@...gle.com> wrote:
> >
> > Adding a sysctl knob to allow user to specify a default
> > rto_min at socket init time.
>
> I wonder what the advantage of this new sysctl knob is since we have
> had BPF or something like that to tweak the rto min already?
>
> There are so many places/parameters of the TCP stack that can be
> exposed to the user side and adjusted by new sysctls...
>
> Thanks,
> Jason
>
> >
> > After this patch series, the rto_min will has multiple sources:
> > route option has the highest precedence, followed by the
> > TCP_BPF_RTO_MIN socket option, followed by this new
> > tcp_rto_min_us sysctl.
> >
> > Kevin Yang (2):
> >   tcp: derive delack_max with tcp_rto_min helper
> >   tcp: add sysctl_tcp_rto_min_us
> >
> >  Documentation/networking/ip-sysctl.rst | 13 +++++++++++++
> >  include/net/netns/ipv4.h               |  1 +
> >  net/ipv4/sysctl_net_ipv4.c             |  8 ++++++++
> >  net/ipv4/tcp.c                         |  3 ++-
> >  net/ipv4/tcp_ipv4.c                    |  1 +
> >  net/ipv4/tcp_output.c                  | 11 ++---------
> >  6 files changed, 27 insertions(+), 10 deletions(-)
> >
> > --
> > 2.45.1.288.g0e0cd299f1-goog
> >
> >

Oh, I think you should have added Paolo as well.

+Paolo Abeni