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Date:	Tue, 11 Sep 2007 08:21:54 -0700
From:	David Stevens <>
To:	YOSHIFUJI Hideaki / 吉藤英明 
Subject: Re: [PATCH][2/2] Add ICMPMsgStats MIB (RFC 4293)

Yoshifuji Hideaki <> wrote on 09/11/2007 01:50:53 

> Dave, we've been supporting per-interface stats for IPv6, and
> you seem to remove them.  Please keep them.  Thank you.

        The reason I didn't for ICMPMsgStats is the size. The RFC requires
in & out counters for all types, whether or not they are known by the OS,
so that's 512 stats.

Because the MIB variables in the existing infrastructure are not 
allocated, that's:

512 * numInterfaces * numCPUs * 2protos

That seems like a lot of mostly-zero memory. Changing them to be run-time
allocated (and re-allocated when new types are seen) is another 
but more significant changes.

"Memory is Cheap."
        -- Doug Comer

So maybe it's not so bad -- I'll roll another per-interface version
to see.


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