netdev - Re: [PATCH v2 net-next 4/4] udp: add batching to udp_rmem

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Date:   Thu, 8 Dec 2016 10:36:22 -0800
From:   Eric Dumazet <edumazet@...gle.com>
To:     Paolo Abeni <pabeni@...hat.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [PATCH v2 net-next 4/4] udp: add batching to udp_rmem_release()

On Thu, Dec 8, 2016 at 10:24 AM, Paolo Abeni <pabeni@...hat.com> wrote:

> Nice one! This sounds like a relevant improvement!
>
> I'm wondering if it may cause regressions with small value of
> sk_rcvbuf ?!? e.g. with:
>
> netperf -t UDP_STREAM  -H 127.0.0.1 -- -s 1280 -S 1280 -m 1024 -M 1024
>

Possibly, then simply we can refine the test to :

size = up->forward_deficit;
if (size < (sk->sk_rcvbuf >> 2)  && !skb_queue_empty(sk->sk_receive_buf))
     return;