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

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Date:	Mon, 05 May 2008 17:55:35 -0700
From:	"Michael Chan" <mchan@...adcom.com>
To:	"David Miller" <davem@...emloft.net>
cc:	akpm@...ux-foundation.org, netdev <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

On Mon, 2008-05-05 at 16:18 -0700, David Miller wrote:
> 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.
> 
> 

The width of hardware counters may also be limited and so periodic
fetching or DMA may be needed to prevent overflow.

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