netdev - Re: [PATCH net-next 0/2] RTAX_INITRWND should be able to bring the rcv

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Message-ID: <20220721185401.0bbcd1d0@kernel.org>
Date:   Thu, 21 Jul 2022 18:54:01 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Marek Majkowski <marek@...udflare.com>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org,
        kernel-team@...udflare.com, ivan@...udflare.com,
        edumazet@...gle.com, davem@...emloft.net, pabeni@...hat.com,
        ast@...nel.org, daniel@...earbox.net, andrii@...nel.org
Subject: Re: [PATCH net-next 0/2] RTAX_INITRWND should be able to bring the
 rcv_ssthresh above 64KiB

On Thu, 21 Jul 2022 17:10:39 +0200 Marek Majkowski wrote:
> Among many route options we support initrwnd/RTAX_INITRWND path
> attribute:
> 
>  $ ip route change local 127.0.0.0/8 dev lo initrwnd 1024
> 
> This sets the initial receive window size (in packets). However, it's
> not very useful in practice. For smaller buffers (<128KiB) it can be
> used to bring the initial receive window down, but it's hard to
> imagine when this is useful. The same effect can be achieved with
> TCP_WINDOW_CLAMP / RTAX_WINDOW option.

I think you based this on bpf-next so you should put bpf-next 
in the subject, it doesn't apply to net-next. Either way let's 
wait for Eric to comment.