netdev - Re: [PATCH net-next 4/4] net: Add Open vSwitch kernel components.

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Date:	Fri, 18 Nov 2011 17:09:17 -0800 (PST)
From:	Stephen Hemminger <stephen.hemminger@...tta.com>
To:	Jesse Gross <jesse@...ira.com>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	dev@...nvswitch.org
Subject: Re: [PATCH net-next 4/4] net: Add Open vSwitch kernel components.


> On Fri, Nov 18, 2011 at 3:23 PM, Stephen Hemminger
> <shemminger@...tta.com> wrote:
> > On Fri, 18 Nov 2011 15:12:18 -0800
> > Jesse Gross <jesse@...ira.com> wrote:
> >
> >> +             write_seqcount_begin(&stats->seqlock);
> >> +             stats->tx_packets++;
> >> +             stats->tx_bytes += sent;
> >> +             write_seqcount_end(&stats->seqlock);
> >
> > There is a u64_stats_sync set of macros for this. It has the
> > advantage of becoming a NOP on 64 bit platforms.
> 
> The reason why I did it this way is it ties the packet and byte count
> together.

Ok, but why bother?
No other software counters bother to group bytes/packets. Even
hardware counters get read separately.
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