Re: 64 bit netdev stats counter

Andrew Morton
2002-07-12T22:26:19Z

"David S. Miller" wrote:
>
> From: Alan Cox <alan@lxorguk.ukuu.org.uk>
> Date: 13 Jul 2002 00:20:53 +0100
>
> gcc will output
>
> increment low 32bit
> if zero
> increment high
>
> Which means we can rapidly get 2^32 out of sync
>
> True and this equals the "fix" suggested C code involving
> two 32-bit counters that the original author posted :-)
>

Could you make the counters per-cpu and only add them all up
in the rare case where someone wants to read the stats?

And then change all the drivers ;)

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