[ovs-dev] [PATCH net-next 4/4] net: Add Open vSwitch kernel components.
stephen.hemminger at vyatta.com
Fri Nov 18 17:09:17 PST 2011
> On Fri, Nov 18, 2011 at 3:23 PM, Stephen Hemminger
> <shemminger at vyatta.com> wrote:
> > On Fri, 18 Nov 2011 15:12:18 -0800
> > Jesse Gross <jesse at nicira.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
Ok, but why bother?
No other software counters bother to group bytes/packets. Even
hardware counters get read separately.
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