netdev - Re: Receive steering and hash and cache misses

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Date:	Fri, 2 Apr 2010 11:54:39 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Tom Herbert <therbert@...gle.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>, netdev@...r.kernel.org
Subject: Re: Receive steering and hash and cache misses

On Fri, 2 Apr 2010 10:59:43 -0700
Tom Herbert <therbert@...gle.com> wrote:

> On Fri, Apr 2, 2010 at 10:26 AM, Stephen Hemminger
> <shemminger@...tta.com> wrote:
> >
> > Although Receive Packet Steering can use a hardware generated receive hash
> > the device driver still causes an unnecessary cache miss on the interrupt
> > processing CPU.  The current Ethernet network device driver receive processing
> > has the device driver calling eth_type_trans() which causes a the
> > interrupt CPU to read the received frame header.
> >
> 
> It should be possible to deduce the values set by eth_type_trans from
> the RX descriptor along with the RX hash.  I'll post the patch getting
> rxhash from bnx2x which does this.
> 

On sky2, I get only RSS, Checksum, and length from descriptor info.
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