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Date:   Sat, 14 Oct 2023 12:38:14 -0400
From:   Sasha Levin <sashal@kernel.org>
To:     craig <craig@haquarter.de>
Cc:     "stable@vger.kernel.org" <stable@vger.kernel.org>
Subject: Re: tcp: enforce receive buffer memory limits by allowing the tcp
 window to shrink
Message-ID: <ZSrD9s8UPGFq1Wpu@sashalap>
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On Fri, Oct 13, 2023 at 09:02:54AM +0000, craig wrote:
>Hi,
>
>I hope I'm doing this correctly, as per https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html, Option 2. :)
>
>Subject of the patch: tcp: enforce receive buffer memory limits by allowing the tcp window to shrink
>Full details including reproducers, impact, tests are available here: https://blog.cloudflare.com/unbounded-memory-usage-by-tcp-for-receive-buffers-and-how-we-fixed-it/
>
>commit ID: b650d953cd391595e536153ce30b4aab385643ac
>
>Why I think it should be applied:
>- linux TCP sessions are allocating more memory than they should
>- the kernel drops incoming packets which it should not drop
>- large amounts of memory can be saved (see https://blog.cloudflare.com/unbounded-memory-usage-by-tcp-for-receive-buffers-and-how-we-fixed-it/#memory)
>
>What kernel versions you wish it to be applied to: 6.1.x (stable).
>Thank you! :)

Queued up, thanks.

-- 
Thanks,
Sasha