netdev - Re: 64-bit net_device

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Message-ID: <20100602145912.56ef62c2@nehalam>
Date:	Wed, 2 Jun 2010 14:59:12 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	David Miller <davem@...emloft.net>, junchangwang@...il.com,
	romieu@...zoreil.com, netdev@...r.kernel.org
Subject: Re: 64-bit net_device_stats

On Wed, 02 Jun 2010 22:34:29 +0100
Ben Hutchings <bhutchings@...arflare.com> wrote:

> Changing the counter types to u64 for 32-bit architectures would remove
> atomicity and expose half-updated counters to userland.  Changing the
> driver interface significantly so that atomicity is not needed would
> require changes to hundreds of drivers.

Another big issue is maintaining ABI compatibility for /proc and ioctl
interfaces. So bigger values would only be available through netlink,
and most applications using counters don't use netlink. 

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