netdev - RE: [PATCH v2 4/6] net: fec: Increase buffer descriptor entry number

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Date:	Thu, 5 Jun 2014 08:06:36 +0000
From:	"fugang.duan@...escale.com" <fugang.duan@...escale.com>
To:	David Laight <David.Laight@...LAB.COM>,
	"davem@...emloft.net" <davem@...emloft.net>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"shawn.guo@...aro.org" <shawn.guo@...aro.org>,
	"Fabio.Estevam@...escale.com" <Fabio.Estevam@...escale.com>,
	"ezequiel.garcia@...e-electrons.com" 
	<ezequiel.garcia@...e-electrons.com>,
	"bhutchings@...arflare.com" <bhutchings@...arflare.com>,
	"stephen@...workplumber.org" <stephen@...workplumber.org>,
	"Frank.Li@...escale.com" <Frank.Li@...escale.com>,
	"eric.dumazet@...il.com" <eric.dumazet@...il.com>
Subject: RE: [PATCH v2 4/6] net: fec: Increase buffer descriptor entry number

Hi, David,

From: David Laight <David.Laight@...LAB.COM> Data: Wednesday, June 04, 2014 5:27 PM
> To: Duan Fugang-B38611; davem@...emloft.net
> Cc: netdev@...r.kernel.org; shawn.guo@...aro.org; Estevam Fabio-R49496;
> ezequiel.garcia@...e-electrons.com; bhutchings@...arflare.com;
> stephen@...workplumber.org; Li Frank-B20596; eric.dumazet@...il.com
> Subject: RE: [PATCH v2 4/6] net: fec: Increase buffer descriptor entry
> number
> 
> From: Fugang Duan
> > In order to support SG, software TSO, let's increase BD entry number.
> >
> > CC: Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>
> > CC: Eric Dumazet <eric.dumazet@...il.com>
> > CC: David Laight <David.Laight@...LAB.COM>
> > Signed-off-by: Fugang Duan <B38611@...escale.com>
> > ---
> >  drivers/net/ethernet/freescale/fec.h      |    6 +++---
> >  drivers/net/ethernet/freescale/fec_main.c |   21 ++++++++++++---------
> >  2 files changed, 15 insertions(+), 12 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/freescale/fec.h
> b/drivers/net/ethernet/freescale/fec.h
> > index 3b8d6d1..798ad88 100644
> > --- a/drivers/net/ethernet/freescale/fec.h
> > +++ b/drivers/net/ethernet/freescale/fec.h
> > @@ -240,14 +240,14 @@ struct bufdesc_ex {
> >   * the skbuffer directly.
> >   */
> >
> > -#define FEC_ENET_RX_PAGES	8
> > +#define FEC_ENET_RX_PAGES	128
> >  #define FEC_ENET_RX_FRSIZE	2048
> >  #define FEC_ENET_RX_FRPPG	(PAGE_SIZE / FEC_ENET_RX_FRSIZE)
> >  #define RX_RING_SIZE		(FEC_ENET_RX_FRPPG * FEC_ENET_RX_PAGES)
> > ...
> 
> You are changing the number of rx descriptors as well.
> This isn't mentioned in the description.
> 
> And, as I said before, basing this on PAGE_SIZE cannot be right.
> 
> 	David

Ok, I agree your advice.
I will remove the change for RX BD entry. After test, the performance has no impact.

My initial purpose of increasing it is for interrupt coalescing patch. 

Thanks,
Andy
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