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Date: Wed, 14 May 2025 13:24:22 -0700
From: Jakub Kicinski <kuba@kernel.org>
To: Kuniyuki Iwashima <kuniyu@amazon.com>
Cc: Eric Dumazet <edumazet@google.com>, "David S . Miller"
 <davem@davemloft.net>, Paolo Abeni <pabeni@redhat.com>, Neal Cardwell
 <ncardwell@google.com>, Simon Horman <horms@kernel.org>, Rick Jones
 <jonesrick@google.com>, Wei Wang <weiwan@google.com>,
 netdev@vger.kernel.org, eric.dumazet@gmail.com, bpf@vger.kernel.org
Subject: Re: [PATCH net-next 11/11] tcp: increase tcp_rmem[2] to 32 MB
Message-ID: <20250514132422.2eefdbf1@kernel.org>
In-Reply-To: <20250513193919.1089692-12-edumazet@google.com>
References: <20250513193919.1089692-1-edumazet@google.com>
	<20250513193919.1089692-12-edumazet@google.com>
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On Tue, 13 May 2025 19:39:19 +0000 Eric Dumazet wrote:
> Last change to tcp_rmem[2] happened in 2012, in commit b49960a05e32
> ("tcp: change tcp_adv_win_scale and tcp_rmem[2]")
> 
> TCP performance on WAN is mostly limited by tcp_rmem[2] for receivers.
> 
> After this series improvements, it is time to increase the default.

I think this breaks the BPF syncookie test, Kuniyuki any idea why?

https://github.com/kernel-patches/bpf/actions/runs/15016644781/job/42196471693