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Date: Thu, 1 Jun 2006 00:18:25 -0600
From: "Brian F. G. Bidulock" <bidulock@openss7.org>
To: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Cc: David Miller <davem@davemloft.net>, draghuram@rocketmail.com,
       linux-kernel@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: Question about tcp hash function tcp_hashfn()
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Evgeniy,

On Thu, 01 Jun 2006, Evgeniy Polyakov wrote:
> 	
> 	for (i=0; i<hash_size*iter_num; ++i) {
> 		saddr = num2ip(get_random_byte(), get_random_byte(), get_random_byte(), get_random_byte());
> 		sport = get_random_word();

You still have a problem: you cannot use a pseudo-random number
generator to generate the sample set as the pseudo-random number
generator function itself can interact with the hash.

Try iterating through all 2**48 values or at least a sizeable
representative subset.