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Date:   Thu, 21 Jul 2022 18:54:01 -0700
From:   Jakub Kicinski <kuba@kernel.org>
To:     Marek Majkowski <marek@cloudflare.com>
Cc:     netdev@vger.kernel.org, bpf@vger.kernel.org,
        kernel-team@cloudflare.com, ivan@cloudflare.com,
        edumazet@google.com, davem@davemloft.net, pabeni@redhat.com,
        ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org
Subject: Re: [PATCH net-next 0/2] RTAX_INITRWND should be able to bring the
 rcv_ssthresh above 64KiB
Message-ID: <20220721185401.0bbcd1d0@kernel.org>
In-Reply-To: <20220721151041.1215017-1-marek@cloudflare.com>
References: <20220721151041.1215017-1-marek@cloudflare.com>
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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.