netdev - Re: [PATCH net-next 0/3] net: add new socket option SO_RESERVE

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Date:   Mon, 27 Sep 2021 17:50:17 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Wei Wang <weiwan@...gle.com>
Cc:     "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Shakeel Butt <shakeelb@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH net-next 0/3] net: add new socket option SO_RESERVE_MEM

On Mon, 27 Sep 2021 11:25:20 -0700 Wei Wang wrote:
> This patch series introduces a new socket option SO_RESERVE_MEM. 
> This socket option provides a mechanism for users to reserve a certain
> amount of memory for the socket to use. When this option is set, kernel
> charges the user specified amount of memory to memcg, as well as
> sk_forward_alloc. This amount of memory is not reclaimable and is
> available in sk_forward_alloc for this socket.
> With this socket option set, the networking stack spends less cycles
> doing forward alloc and reclaim, which should lead to better system
> performance, with the cost of an amount of pre-allocated and
> unreclaimable memory, even under memory pressure.

Does not apply cleanly - would you mind rebasing/resending?

Would you be able to share what order of magnitude improvements you see?

Thanks!