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

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Date:	Wed, 03 Sep 2014 09:21:25 +0300
From:	Eliezer Tamir <eliezer.tamir@...ux.intel.com>
To:	Jason Wang <jasowang@...hat.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 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
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