netdev - Re: [vger.kernel.org代发]Re: [PATCH net-next] net/packet: fix TPACKET

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Message-ID: <CAF=yD-LAWc0POejfaB_xRW97BoVdLd6s6kjATyjDFBoK1aP-9Q@mail.gmail.com>
Date:   Wed, 25 Mar 2020 21:20:41 -0400
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Yi Yang (杨燚)-云服务集团 
        <yangyi01@...pur.com>
Cc:     "yang_y_yi@....com" <yang_y_yi@....com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "u9012063@...il.com" <u9012063@...il.com>
Subject: Re: [vger.kernel.org代发]Re: [PATCH net-next] net/packet: fix TPACKET_V3 performance issue in case of TSO

On Wed, Mar 25, 2020 at 8:45 PM Yi Yang (杨燚)-云服务集团 <yangyi01@...pur.com> wrote:
>
> By the way, even if we used hrtimer, it can't ensure so high performance improvement, the reason is every frame has different size, you can't know how many microseconds one frame will be available, early timer firing will be an unnecessary waste, late timer firing will reduce performance, so I still think the way this patch used is best so far.
>

The key differentiating feature of TPACKET_V3 is the use of blocks to
efficiently pack packets and amortize wake ups.

If you want immediate notification for every packet, why not just use
TPACKET_V2?