linux-kernel - Re: [PATCH net-next 2/2] net: exit busy loop when another process is runnable

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Message-ID: <5406BC69.2090508@redhat.com>
Date:	Wed, 03 Sep 2014 14:59:53 +0800
From:	Jason Wang <jasowang@...hat.com>
To:	Eliezer Tamir <eliezer.tamir@...ux.intel.com>,
	Eric Dumazet <eric.dumazet@...il.com>
CC:	Ingo Molnar <mingo@...nel.org>,
	Mike Galbraith <umgwanakikbuti@...il.com>, davem@...emloft.net,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	mst@...hat.com, Peter Zijlstra <peterz@...radead.org>,
	"Ingo Molnar jacob.e.keller@...el.com" <mingo@...e.hu>
Subject: Re: [PATCH net-next 2/2] net: exit busy loop when another process
 is runnable

On 09/03/2014 02:21 PM, Eliezer Tamir wrote:
> On 02/09/2014 09:31, Jason Wang wrote:
>> On 09/02/2014 02:03 PM, Eliezer Tamir wrote:
>>> On 02/09/2014 06:35, Jason Wang wrote:
>>>> Not sure whether this method will scale considering thousands of sockets
>>>> and processes.
>>> There may be millions of sockets, but in most cases only a handful of
>>> device queues per CPU to busy poll on. I have tested the epoll rfc
>>> code with hundreds of thousands of sockets and one or two device
>>> queues and is scales pretty well.
>>>
>>> The part I don't like in that code is the cumbersome mechanism I used
>>> to track the socket -> queue relationship. I think that if I had more
>>> time to work on it, I would instead look into extending the epoll
>>> interface so that libevent can tell the kernel what it wants, instead
>>> of having the busypoll code try and learn it.
>> I'd like to have a look at this rfc. Could you please give me a pointer?
>> I've done a quick search on kernel mailing list but didn't find it.
> https://lkml.org/lkml/2013/8/21/192
>
> Cheers,
> Eliezer
> --

Thanks. I will have a look at this series.
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