netdev - Re: [PATCH v3 net-next 0/3] net: add new socket option SO_RESERVE

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Date:   Thu, 30 Sep 2021 12:50:08 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Wei Wang <weiwan@...gle.com>
Cc:     davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org,
        edumazet@...gle.com, shakeelb@...gle.com
Subject: Re: [PATCH v3 net-next 0/3] net: add new socket option SO_RESERVE_MEM

Hello:

This series was applied to netdev/net-next.git (refs/heads/master):

On Wed, 29 Sep 2021 10:25:10 -0700 you 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.
> With a tcp_stream test with 10 flows running on a simulated 100ms RTT
> link, I can see the cycles spent in __sk_mem_raise_allocated() dropping
> by ~0.02%. Not a whole lot, since we already have logic in
> sk_mem_uncharge() to only reclaim 1MB when sk_forward_alloc has more
> than 2MB free space. But on a system suffering memory pressure
> constently, the savings should be more.
> 
> [...]

Here is the summary with links:
  - [v3,net-next,1/3] net: add new socket option SO_RESERVE_MEM
    https://git.kernel.org/netdev/net-next/c/2bb2f5fb21b0
  - [v3,net-next,2/3] tcp: adjust sndbuf according to sk_reserved_mem
    https://git.kernel.org/netdev/net-next/c/ca057051cf25
  - [v3,net-next,3/3] tcp: adjust rcv_ssthresh according to sk_reserved_mem
    https://git.kernel.org/netdev/net-next/c/053f368412c9

You are awesome, thank you!
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