linux-kernel - Re: [RFC PATCH 1/5] net: implement support for low latency socket polling

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Date:	Tue, 05 Mar 2013 12:03:02 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	David Miller <davem@...emloft.net>
CC:	bhutchings@...arflare.com, eliezer.tamir@...ux.jf.intel.com,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	jesse.brandeburg@...el.com, e1000-devel@...ts.sourceforge.net,
	willemb@...gle.com, andi@...stfloor.org, eliezer@...ir.org.il
Subject: Re: [RFC PATCH 1/5] net: implement support for low latency socket
 polling

On 03/05/2013 11:55 AM, David Miller wrote:
> From: Ben Hutchings <bhutchings@...arflare.com>
> Date: Tue, 5 Mar 2013 16:43:01 +0000
> 
>> In general it appears to require a run-time check.  You might need to
>> augment <asm/timex.h>.
> 
> On the other hand, unlike get_cycles, sched_clock() is always available.
> 

On the gripping hand, we need to know when it uses something like
jiffies, in which case we probably need to disable the whole interface.

	-hpa

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