netdev - RE: [PATCH 1/2] ibm_newemac: Add Support for MAL Interrupt Coalescing

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Date:	Mon, 21 Sep 2009 16:49:26 -0700
From:	"Prodyut Hazarika" <phazarika@...c.com>
To:	"Benjamin Herrenschmidt" <benh@...nel.crashing.org>
Cc:	<netdev@...r.kernel.org>, "Feng Kan" <fkan@...c.com>,
	"Loc Ho" <lho@...c.com>, "Victor Gallardo" <vgallardo@...c.com>,
	<bhutchings@...arflare.com>, <linuxppc-dev@...ts.ozlabs.org>,
	<davem@...emloft.net>, <jwboyer@...ux.vnet.ibm.com>,
	<lada.podivin@...il.com>
Subject: RE: [PATCH 1/2] ibm_newemac: Add Support for MAL Interrupt Coalescing

Hi Ben,
Thanks for your comments.


> What happens if we build a kernel that is supposed to boot with two
> different variants of 405 or 440 ?

We cannot build a kernel with H/W Interrupt coalescing other than in
405EX/460EX/GT.
This is controlled via KConfig (config IBM_NEW_EMAC_INTR_COALESCE
depends on IBM_NEW_EMAC && (460EX || 460GT || 405EX))
Is this approach acceptable (via Kconfig)?


> There are existing mechanisms via ethtool to configure coalescing. You
> should hookup onto these.

I will start looking at the ethtool options

Thanks
Prodyut


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