netdev - Re: [PACTH iproute2-next] ip: dynamically size columns when printing stats

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Message-ID: <20210503075739.46654252@hermes.local>
Date:   Mon, 3 May 2021 07:57:39 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     dsahern@...il.com, netdev@...r.kernel.org
Subject: Re: [PACTH iproute2-next] ip: dynamically size columns when
 printing stats

On Fri, 30 Apr 2021 20:10:59 -0700
Jakub Kicinski <kuba@...nel.org> wrote:

> This change makes ip -s -s output size the columns
> automatically. I often find myself using json
> output because the normal output is unreadable.
> Even on a laptop after 2 days of uptime byte
> and packet counters almost overflow their columns,
> let alone a busy server.
> 
> For max readability switch to right align.
> 
> Before:
> 
>     RX: bytes  packets  errors  dropped missed  mcast
>     8227918473 8617683  0       0       0       0
>     RX errors: length   crc     frame   fifo    overrun
>                0        0       0       0       0
>     TX: bytes  packets  errors  dropped carrier collsns
>     691937917  4727223  0       0       0       0
>     TX errors: aborted  fifo   window heartbeat transns
>                0        0       0       0       10
> 
> After:
> 
>     RX:  bytes packets errors dropped  missed   mcast
>     8228633710 8618408      0       0       0       0
>     RX errors:  length    crc   frame    fifo overrun
>                      0      0       0       0       0
>     TX:  bytes packets errors dropped carrier collsns
>      692006303 4727740      0       0       0       0
>     TX errors: aborted   fifo  window heartbt transns
>                      0      0       0       0      10
> 
> More importantly, with large values before:
> 
>     RX: bytes  packets  errors  dropped overrun mcast
>     126570234447969 15016149200 0       0       0       0
>     RX errors: length   crc     frame   fifo    missed
>                0        0       0       0       0
>     TX: bytes  packets  errors  dropped carrier collsns
>     126570234447969 15016149200 0       0       0       0
>     TX errors: aborted  fifo   window heartbeat transns
>                0        0       0       0       10
> 
> Note that in this case we have full shift by a column,
> e.g. the value under "dropped" is actually for "errors" etc.
> 
> After:
> 
>     RX:       bytes     packets errors dropped  missed   mcast
>     126570234447969 15016149200      0       0       0       0
>     RX errors:           length    crc   frame    fifo overrun
>                               0      0       0       0       0
>     TX:       bytes     packets errors dropped carrier collsns
>     126570234447969 15016149200      0       0       0       0
>     TX errors:          aborted   fifo  window heartbt transns
>                               0      0       0       0      10
> 
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>

Looks good to me.

Maybe good time to refactor the code to make it table driven rather
than individual statistic items.