netdev - Re: [PATCH net-next] net: introduce SO_INCOMING

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Message-ID: <CALCETrVY3CPE=aCqqe5TPxw=f0Za0EMsKPcGn5ecwbtBKSBxHg@mail.gmail.com>
Date:	Fri, 14 Nov 2014 15:40:20 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Tom Herbert <therbert@...gle.com>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>, Ying Cai <ycai@...gle.com>,
	Willem de Bruijn <willemb@...gle.com>,
	Neal Cardwell <ncardwell@...gle.com>,
	Linux API <linux-api@...r.kernel.org>
Subject: Re: [PATCH net-next] net: introduce SO_INCOMING_CPU

On Fri, Nov 14, 2014 at 3:32 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> On Fri, 2014-11-14 at 15:03 -0800, Andy Lutomirski wrote:
>
>> If the kernel had an API for this, I'd be all for using it.
>
> It would be user land code, not kernel.
>
> Why doing a system call when you can avoid it ? ;)
>
> Doing it in the kernel would be quite complex actually.

A semi-official library would work, too.  As long as it kept working.

>
> In userland, you can even implement this by machine learning.
>
> For every connection you made, you get the 4-tuple and INCOMING_CPU,
> then you store it in a cache.

Eww :(

>
> Next time you need to connect to same remote peer, you can lookup in the
> cache to find a good candidate.
>
> It would actually be good if we could do in a single socket verb a
> bind_and_connect(fd, &source, &destination)

Fair enough.  Although for my use case, the time it takes to connect
is completely irrelevant.

--Andy

>
>



-- 
Andy Lutomirski
AMA Capital Management, LLC
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