netdev - RE: [PATCH iproute2 v4 3/4] ifstat: Add 64 bits based stats to extended statistics

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Date:   Thu, 19 Jan 2017 15:21:40 +0000
From:   Nogah Frankel <nogahf@...lanox.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "roszenrami@...il.com" <roszenrami@...il.com>,
        "roopa@...ulusnetworks.com" <roopa@...ulusnetworks.com>,
        Jiri Pirko <jiri@...lanox.com>,
        Ido Schimmel <idosch@...lanox.com>,
        Elad Raz <eladr@...lanox.com>,
        Yotam Gigi <yotamg@...lanox.com>,
        Or Gerlitz <ogerlitz@...lanox.com>
Subject: RE: [PATCH iproute2 v4 3/4] ifstat: Add 64 bits based stats to
 extended statistics

> -----Original Message-----
> From: Nogah Frankel
> Sent: Sunday, January 15, 2017 3:55 PM
> To: 'Stephen Hemminger' <stephen@...workplumber.org>
> Cc: netdev@...r.kernel.org; roszenrami@...il.com; roopa@...ulusnetworks.com; Jiri
> Pirko <jiri@...lanox.com>; Ido Schimmel <idosch@...lanox.com>; Elad Raz
> <eladr@...lanox.com>; Yotam Gigi <yotamg@...lanox.com>; Or Gerlitz
> <ogerlitz@...lanox.com>
> Subject: RE: [PATCH iproute2 v4 3/4] ifstat: Add 64 bits based stats to extended statistics
> 
> 
> 
> > -----Original Message-----
> > From: Stephen Hemminger [mailto:stephen@...workplumber.org]
> > Sent: Friday, January 13, 2017 3:44 AM
> > To: Nogah Frankel <nogahf@...lanox.com>
> > Cc: netdev@...r.kernel.org; roszenrami@...il.com; roopa@...ulusnetworks.com;
> Jiri
> > Pirko <jiri@...lanox.com>; Ido Schimmel <idosch@...lanox.com>; Elad Raz
> > <eladr@...lanox.com>; Yotam Gigi <yotamg@...lanox.com>; Or Gerlitz
> > <ogerlitz@...lanox.com>
> > Subject: Re: [PATCH iproute2 v4 3/4] ifstat: Add 64 bits based stats to extended statistics
> >
> > On Thu, 12 Jan 2017 15:49:50 +0200
> > Nogah Frankel <nogahf@...lanox.com> wrote:
> >
> > > The default stats for ifstat are 32 bits based.
> > > The kernel supports 64 bits based stats. (They are returned in struct
> > > rtnl_link_stats64 which is an exact copy of struct rtnl_link_stats, in
> > > which the "normal" stats are returned, but with fields of u64 instead of
> > > u32). This patch adds them as an extended stats.
> > >
> > > It is read with filter type IFLA_STATS_LINK_64 and no sub type.
> > >
> > > It is under the name 64bits
> > > (or any shorten of it as "64")
> > >
> > > For example:
> > > ifstat -x 64bit
> > >
> > > Signed-off-by: Nogah Frankel <nogahf@...lanox.com>
> > > Reviewed-by: Jiri Pirko <jiri@...lanox.com>
> >
> > Other commands (like ip link) always use the 64 bit statistics if available
> > from the device. I see no reason that ifstat needs to be different.
> >
> 
> Do you mean to change the default ifstat results to be 64 bits based?
> I tried it in the first version, but Roopa commented that it was not a good idea.
> She said they tried it in the past and it caused backward compatibilities problems.
> (Or maybe I didn't understand correctly)

So, can I leave the default ifstat results to be 32 bits based, for the time being?