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

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Message-ID: <BANLkTimSRhuVTcOX-EHx74_y3pnDdCRi8A@mail.gmail.com>
Date:	Wed, 6 Apr 2011 08:24:16 -0700
From:	Tom Herbert <therbert@...gle.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Alexander Duyck <alexander.h.duyck@...el.com>,
	Brattain <ross.b.brattain@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [RFC] ixgbe: is DCA really that good ?

On Wed, Apr 6, 2011 at 6:44 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> 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 + accelerated RFS might make good.  But I agree that it should be
configurable.

> -> 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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