netdev - Re: [RFC 1/2] igb: statistic optimization

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Message-ID: <48FF64E8.4050907@hp.com>
Date:	Wed, 22 Oct 2008 10:37:44 -0700
From:	Rick Jones <rick.jones2@...com>
To:	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>
CC:	Stephen Hemminger <shemminger@...tta.com>,
	"jeffery.t.kirsher@...el.com" <jeffery.t.kirsher@...el.com>,
	"Allan, Bruce W" <bruce.w.allan@...el.com>,
	"Waskiewicz Jr, Peter P" <peter.p.waskiewicz.jr@...el.com>,
	"e1000-devel@...ts.sourceforge.net" 
	<e1000-devel@...ts.sourceforge.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [RFC 1/2] igb: statistic optimization

> I don't think you want to put this in the code that can be called directly 
> from IOCTL from userspace.  This function can take a lot of cycles and 
> some silly applications like gkrellm call it quite frequently.  The 
> update_stats function will be called as part of the watchdog anyway, and 
> you already got the interesting stats for realtime with the tx and rx 
> bytes/packets.

On the flip side aren't there "out of phase" issues with pulling stats 
based on a timer vs something like a netstat -i 1 command?

rick jones
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