netdev - Re: [PATCH 2/2] ss: implement -M option to get all memory information

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Message-ID: <20120427102138.67bd6b3a@nehalam.linuxnetplumber.net>
Date:	Fri, 27 Apr 2012 10:21:38 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Shan Wei <shanwei88@...il.com>
Cc:	xemul@...allels.com, NetDev <netdev@...r.kernel.org>
Subject: Re: [PATCH 2/2] ss: implement -M option to get all memory
 information

On Fri, 27 Apr 2012 10:04:17 +0800
Shan Wei <shanwei88@...il.com> wrote:

> Stephen Hemminger said, at 2012/4/26 1:41:
> 
> >>  "   -m, --memory        show socket memory usage\n"
> >> +"   -M, --skmem         show socket memory information.\n"
> >> +"                       this option which will replace -m, is valid since Linux 3.3.\n"
> > 
> > Please don't add reference to kernel version.
> > Why does this need to be a new option? Maybe just do the right thing
> > if present in the netlink response?
> 
> 
> Actually, I'm ok for your suggestion that using a existing option(-m) to
> export all memory information. But with a new option is better for us.

Why? if you are arguing to replace the option anyway.

> Maybe some people use latest iproute source with under kernel 3.3.0, some don't.
> -m option will take different user experience, specially for UDP socket.
> Currently -m option has no effect on UDP socket which i will submit another patch
> to export memory information for. new option, fresh experience.

Lots of options return more or different information based on kernel
version, probably the biggest example is how stats are processed.

> (Exporting out memory information will help us to analysis dropped packets 
> which recorded in RcvbufErrors and SndbufErrors.)
>  
> 
>  
> 

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