netdev - Re: packet received in a wrong rx-queue?

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Message-Id: <20110518.233614.1134947771941589398.davem@davemloft.net>
Date:	Wed, 18 May 2011 23:36:14 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	Jon.Zhou@...u.com
Cc:	e1000-devel@...ts.sourceforge.net, netdev@...r.kernel.org
Subject: Re: packet received in a wrong rx-queue?

From: Jon Zhou <Jon.Zhou@...u.com>
Date: Wed, 18 May 2011 20:22:07 -0700

> form the 82599 datasheet, the hash algorithm is consist of src/dst
> ip, src/dst port,protocol why it got different hash value with same
> ip/port pair?

The same reason why feeding different sets of discrete 32-bit and
16-bit values to a cryptographic hash results in a different final
hash value.

Our software RPS/RFS implementation used to have this quality too.
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