From: Eric Dumazet <eric.dumazet@gmail.com>
To: David Laight <David.Laight@ACULAB.COM>
Cc: Eliezer Tamir <eliezer.tamir@linux.intel.com>,
David Miller <davem@davemloft.net>,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
Jesse Brandeburg <jesse.brandeburg@intel.com>,
Don Skidmore <donald.c.skidmore@intel.com>,
e1000-devel@lists.sourceforge.net,
Willem de Bruijn <willemb@google.com>,
Andi Kleen <andi@firstfloor.org>, HPA <hpa@zytor.com>,
Eilon Greenstien <eilong@broadcom.com>,
Or Gerlitz <or.gerlitz@gmail.com>,
Alex Rosenbaum <alexr@mellanox.com>,
Eliezer Tamir <eliezer@tamir.org.il>
Subject: RE: [PATCH v6 net-next 2/5] net: implement support for low latency socket polling
Date: Wed, 29 May 2013 06:48:57 -0700 [thread overview]
Message-ID: <1369835337.5109.24.camel@edumazet-glaptop> (raw)
In-Reply-To: <AE90C24D6B3A694183C094C60CF0A2F6026B7257@saturn3.aculab.com>
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.
next prev parent reply other threads:[~2013-05-29 13:49 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-29 6:39 [PATCH v6 net-next 0/5] net: low latency Ethernet device polling Eliezer Tamir
2013-05-29 6:39 ` [PATCH v6 net-next 1/5] net: add napi_id and hash Eliezer Tamir
2013-05-29 12:56 ` Eric Dumazet
2013-05-29 13:09 ` David Laight
2013-05-29 13:43 ` Eric Dumazet
2013-05-29 15:04 ` Eliezer Tamir
2013-05-29 20:09 ` Ben Hutchings
2013-05-30 6:51 ` Eliezer Tamir
2013-05-29 6:39 ` [PATCH v6 net-next 2/5] net: implement support for low latency socket polling Eliezer Tamir
2013-05-29 13:37 ` Eric Dumazet
2013-05-29 13:42 ` David Laight
2013-05-29 13:48 ` Eric Dumazet [this message]
2013-05-29 14:01 ` Eliezer Tamir
[not found] ` <CALuTh9EvzhDaqnVV35wytNg6kJhm+HbOjp5tdxWS9bCTVM5YSA@mail.gmail.com>
2013-05-29 15:01 ` Eliezer Tamir
2013-05-29 14:14 ` Or Gerlitz
2013-05-29 14:40 ` yaniv saar
2013-05-29 14:59 ` Eliezer Tamir
2013-05-29 18:52 ` Or Gerlitz
2013-05-29 19:08 ` Eric Dumazet
2013-05-30 5:58 ` Eliezer Tamir
2013-05-30 6:04 ` Eliezer Tamir
2013-05-29 20:20 ` Ben Hutchings
2013-05-29 6:39 ` [PATCH v6 net-next 3/5] tcp: add TCP support for low latency receive poll Eliezer Tamir
2013-05-29 13:38 ` Eric Dumazet
2013-05-29 6:39 ` [PATCH v6 net-next 4/5] ixgbe: Add support for ndo_ll_poll Eliezer Tamir
2013-05-29 6:40 ` [PATCH v6 net-next 5/5] ixgbe: add extra stats " Eliezer Tamir
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