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

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Message-ID: <ae8aee40-4987-0554-e415-0922aca85cd6@gmail.com>
Date:   Sun, 9 May 2021 16:53:00 -0600
From:   David Ahern <dsahern@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>, stephen@...workplumber.org
Cc:     netdev@...r.kernel.org
Subject: Re: [PACTH iproute2-next] ip: dynamically size columns when printing
 stats

On 4/30/21 9:10 PM, Jakub Kicinski 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>
> ---
> Note - this patch does depend on the trivial nohandler print fix.
> 
>  ip/ipaddress.c | 146 +++++++++++++++++++++++++++++++++++--------------
>  1 file changed, 106 insertions(+), 40 deletions(-)
> 

good improvement. applied. Thanks,