netdev - Re: [Bugme-new] [Bug 10600] New: e1000 updates rx

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Date:	Mon, 05 May 2008 16:18:06 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	akpm@...ux-foundation.org
Cc:	netdev@...r.kernel.org, bugme-daemon@...zilla.kernel.org,
	jesse.brandeburg@...el.com, john.ronciak@...el.com, liblit@....org
Subject: Re: [Bugme-new] [Bug 10600] New: e1000 updates rx_bytes
 infrequently

From: Andrew Morton <akpm@...ux-foundation.org>
Date: Mon, 5 May 2008 15:55:02 -0700

> I've noticed that when I'm downloading stuff at home, gkrellm will display
> eth0 as consuming 0 kbytes/sec, then 400 kbytes/sec, then 0, then 400 ad
> nauseum.  I always assumed that gkrellm was busted.  Perhaps wrongly...

It's a tradeoff between excess DMA traffic updating the statistics,
and having them updated more frequently.

Actually, the thing that matters is when ->get_stats() is called.

So if a driver can trigger a statistics DMA update at ->get_stats()
time, that's probably what it should do.  But this could get
expensive and make the "do DMA less often" optimization less useful.

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