netdev - Re: [PATCH net-next 02/11] udp/ipv6: refactor udpv6

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Message-ID: <229c169ccf8fdbf7fc826901982f1f15e86f3d17.camel@redhat.com>
Date:   Thu, 28 Apr 2022 16:09:37 +0200
From:   Paolo Abeni <pabeni@...hat.com>
To:     Pavel Begunkov <asml.silence@...il.com>, netdev@...r.kernel.org,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     David Ahern <dsahern@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 02/11] udp/ipv6: refactor udpv6_sendmsg udplite
 checks

On Thu, 2022-04-28 at 11:56 +0100, Pavel Begunkov wrote:
> Don't save a IS_UDPLITE() result in advance but do when it's really
> needed, so it doesn't store/load it from the stack. Same for resolving
> the getfrag callback pointer.

It's quite unclear to me if this change brings really any performance
benefit. The end results will depend a lot on the optimization
performed by the compiler, and IMHO the code looks better before this
modifications.

Paolo