netdev - Re: [PATCH net-next] tcp: sk_forced_mem

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Message-ID: <CALvZod55M7Dnjp0HWJem4k4NLkptbSY+=fkA1Nie=mZ8cD2Fng@mail.gmail.com>
Date:   Sat, 11 Jun 2022 14:13:52 -0700
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        netdev <netdev@...r.kernel.org>,
        Soheil Hassas Yeganeh <soheil@...gle.com>,
        Wei Wang <weiwan@...gle.com>,
        Neal Cardwell <ncardwell@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH net-next] tcp: sk_forced_mem_schedule() optimization

On Fri, Jun 10, 2022 at 8:30 PM Eric Dumazet <eric.dumazet@...il.com> wrote:
>
> From: Eric Dumazet <edumazet@...gle.com>
>
> sk_memory_allocated_add() has three callers, and returns
> to them @memory_allocated.
>
> sk_forced_mem_schedule() is one of them, and ignores
> the returned value.
>
> Change sk_memory_allocated_add() to return void.
>
> Change sock_reserve_memory() and __sk_mem_raise_allocated()
> to call sk_memory_allocated().
>
> This removes one cache line miss [1] for RPC workloads,
> as first skbs in TCP write queue and receive queue go through
> sk_forced_mem_schedule().
>
> [1] Cache line holding tcp_memory_allocated.
>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Reviewed-by: Shakeel Butt <shakeelb@...gle.com>