netdev - Re: [IPoIB] Identify multicast packets and fix IGMP breakage V3

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Message-ID: <alpine.DEB.2.00.1008262123410.29657@router.home>
Date:	Thu, 26 Aug 2010 21:24:15 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	David Miller <davem@...emloft.net>
cc:	jgunthorpe@...idianresearch.com, rdreier@...co.com,
	linux-rdma@...r.kernel.org, ogerlitz@...taire.com,
	yosefe@...taire.com, netdev@...r.kernel.org
Subject: Re: [IPoIB] Identify multicast packets and fix IGMP breakage V3


On Thu, 26 Aug 2010, David Miller wrote:

> The highest cost is bringing in that packet header's cache line, which
> you've already done by reading the byte and checking for 0xff.

And then you need to bring in the cacheline of the broadcast address....
These are pretty long byte strings in the IB case.

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