linux-kernel - Re: [PATCH v2 net-next] net: poll/select low latency socket support

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Message-ID: <51C073C4.7040702@linux.intel.com>
Date:	Tue, 18 Jun 2013 17:50:44 +0300
From:	Eliezer Tamir <eliezer.tamir@...ux.intel.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	David Miller <davem@...emloft.net>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Don Skidmore <donald.c.skidmore@...el.com>,
	e1000-devel@...ts.sourceforge.net,
	Willem de Bruijn <willemb@...gle.com>,
	Ben Hutchings <bhutchings@...arflare.com>,
	Andi Kleen <andi@...stfloor.org>, HPA <hpa@...or.com>,
	Eilon Greenstien <eilong@...adcom.com>,
	Or Gerlitz <or.gerlitz@...il.com>,
	Amir Vadai <amirv@...lanox.com>,
	Alex Rosenbaum <alexr@...lanox.com>,
	Avner Ben Hanoch <avnerb@...lanox.com>,
	Or Kehati <ork@...lanox.com>, sockperf-dev@...glegroups.com,
	Eliezer Tamir <eliezer@...ir.org.il>
Subject: Re: [PATCH v2 net-next] net: poll/select low latency socket support

On 18/06/2013 17:45, Eliezer Tamir wrote:
> On 18/06/2013 17:35, Eric Dumazet wrote:
>> On Tue, 2013-06-18 at 16:25 +0300, Eliezer Tamir wrote:
>>
>>> One other thing,
>>> sock_poll() will only ll_poll if the flag was set _and_ the socket has a
>>> none-zero value in sk->sk_ll_usec so you still only poll on sockets
>>> that were enabled for LLS, not on every socket.
>>
>> But sockets are default enabled for LLS.
>>
>> sock_init_data()
>> {
>>     ...
>>     sk->sk_ll_usec      =   sysctl_net_ll_poll;
>>     ...
>> }
>
> Yes, if you want to globally enable.
>
> But now that we have the socket option, you can leave the global
> setting at 0 and only enable specific sockets via the socket option.
> (I have tested this with a modified sockperf and it works.)

I missed something, you need sysctl_net_ll_poll to be non-zero
for poll to even try.

So maybe add another sysctl value for poll?
maybe sysctl_net_ll_poll for poll
and sysctl_net_ll_read for socket reads?

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