netdev - Re: Extensible hashing and RCU

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Message-ID: <20070220112312.GA665@2ka.mipt.ru>
Date:	Tue, 20 Feb 2007 14:23:13 +0300
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	David Miller <davem@...emloft.net>, akepner@....com,
	linux@...izon.com, netdev@...r.kernel.org, bcrl@...ck.org
Subject: Re: Extensible hashing and RCU

On Tue, Feb 20, 2007 at 12:10:22PM +0100, Eric Dumazet (dada1@...mosbay.com) wrote:
> Please explain why you chose    h = jhash_2words(faddr, laddr, ports);
>         h ^= h >> 16;
>         h ^= h >> 8;
> 
> jhash is very good, no need to try to be smarter, shufling some bytes... and 
> adding artifacts.

If distribution is fair its whift produces still fair distribution.
In the discussion linked at that test I also produced results without
shifts, which were exactly the same.

-- 
	Evgeniy Polyakov
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