netdev - Re: [PATCH] Rate should be u64 to avoid integer overflow at high speeds (>= ~35Gbit)

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Message-ID: <1363103068.13690.11.camel@edumazet-glaptop>
Date:	Tue, 12 Mar 2013 16:44:28 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Thomas Graf <tgraf@...g.ch>
Cc:	Chris Friesen <chris.friesen@...band.com>,
	Bill Fink <billfink@...dspring.com>, Vimal <j.vimal@...il.com>,
	netdev@...r.kernel.org, shemminger <shemminger@...tta.com>
Subject: Re: [PATCH] Rate should be u64 to avoid integer overflow at high
 speeds (>= ~35Gbit)

On Tue, 2013-03-12 at 15:42 +0000, Thomas Graf wrote:

> The introduction of a shift operator or multiplier introduces
> inprecision. I'd much rather see new 64bit Netlink attributes
> that, if present, replace the old rate values and statistics.
> 
> You will need to add a new Netlink attribute anyway and we might
> as well transfer the actual rate instead of a multiplier. Just
> like we did with IFLA_STATS64.

Thanks Thomas !


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