linux-kernel - Re: [PATCH v2 net-next 1/4] net: implement support for low latency socket polling

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Date:	Tue, 21 May 2013 09:16:28 +0300
From:	Eliezer Tamir <eliezer.tamir@...ux.intel.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Dave Miller <davem@...emloft.net>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Don Skidmore <donanld.c.skidmore@...el.com>,
	e1000-devel@...ts.sourceforge.net,
	Willem de Bruijn <willemb@...gle.com>, HPA <hpa@...or.com>,
	Eliezer Tamir <eliezer@...ir.org.il>
Subject: Re: [PATCH v2 net-next 1/4] net: implement support for low latency
 socket polling

On 20/05/2013 19:22, Andi Kleen wrote:
>> diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
>> index f98ca63..cfcf0ea 100644
>> --- a/Documentation/networking/ip-sysctl.txt
>> +++ b/Documentation/networking/ip-sysctl.txt
>> @@ -19,6 +19,11 @@ ip_no_pmtu_disc - BOOLEAN
>>   	Disable Path MTU Discovery.
>>   	default FALSE
>>
>> +ip_low_latency_poll - INTEGER
>> +	Low latency busy poll timeout. (needs CONFIG_INET_LL_RX_POLL)
>> +	Approximate time in ms to spin waiting for packets on the device queue.
>> +	default 0
>
> Can you document the suggested value here?

ok
> Also I would add something like "may increase power usage"

:)
> The other thing I would add is a linuxmib statistic counter so that
> we can see the polling happens.

Yes,
I will add a counter for packets that were received through this path.

Eliezer
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