netdev - [RFC] ixgbe: is DCA really that good ?

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Message-ID: <1302097444.3209.85.camel@edumazet-laptop>
Date:	Wed, 06 Apr 2011 15:44:04 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Alexander Duyck <alexander.h.duyck@...el.com>,
	Brattain <ross.b.brattain@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Cc:	netdev <netdev@...r.kernel.org>
Subject: [RFC] ixgbe: is DCA really that good ?

Hi guys


In a forwarding [or RPS/RFS] setup, why should we populate cpu caches
with full frames content ? We only need first cache line to perform
routing [or RPS/RFS] decision.

-> DCA should be a knob (ethtool ?) that an admin can switch off and on,
port by port, not a CONFIG_IXGBE_DCA thing.

Thanks


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