linux-kernel - RE: [PATCH v6 net-next 2/5] net: implement support for low latency socket polling

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Message-ID: <1369835337.5109.24.camel@edumazet-glaptop>
Date:	Wed, 29 May 2013 06:48:57 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Laight <David.Laight@...LAB.COM>
Cc:	Eliezer Tamir <eliezer.tamir@...ux.intel.com>,
	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>,
	Andi Kleen <andi@...stfloor.org>, HPA <hpa@...or.com>,
	Eilon Greenstien <eilong@...adcom.com>,
	Or Gerlitz <or.gerlitz@...il.com>,
	Alex Rosenbaum <alexr@...lanox.com>,
	Eliezer Tamir <eliezer@...ir.org.il>
Subject: RE: [PATCH v6 net-next 2/5] net: implement support for low latency
 socket polling

On Wed, 2013-05-29 at 14:42 +0100, David Laight wrote:
> > > +/* we don't mind a ~2.5% imprecision */
> > > +#define TSC_MHZ (tsc_khz >> 10)
> 
> Wouldn't (tsc_khz << 10) be better?

We want number of cycles per usec.

Your formula gives number of cycles per 1.024 second.


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