netdev - Re: [PATCH next-next-2.6] netdev: better dev_name

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Message-ID: <20091026104532.5c30c6b9@nehalam>
Date:	Mon, 26 Oct 2009 10:45:32 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	Octavian Purdila <opurdila@...acom.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Krishna Kumar2 <krkumar2@...ibm.com>,
	Hagen Paul Pfeifer <hagen@...u.net>, netdev@...r.kernel.org
Subject: Re: [PATCH next-next-2.6] netdev: better dev_name_hash

Another algorithm that scores well in my tests.

http://isthe.com/chongo/tech/comp/fnv/

Algorithm             Time       Ratio       Max   StdDev
string10             1.433267       1.00     39064   0.01
string_hash17        1.461422       1.00     39497   1.50
fnv1a                1.472216       1.00     39895   2.25
jhash_string         1.482494       1.00     39669   1.04


static unsigned int fnv32(const unsigned char *key, unsigned int len)
{
	uint32_t hval = 2166136261;
	unsigned int i;

	for (i = 0; i < len; i++) {
		hval ^= key[i];
		/* optimized multiply by 0x01000193 */
		hval += (hval<<1) + (hval<<4) + (hval<<7)
			+ (hval<<8) + (hval<<24);
	}

	return hval;
}
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