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IP Upstream Hash

Matthieu Tourne
July 20, 2011 05:20PM
Hi all,

I was looking at the code in ngx_http_upstream_ip_hash_module.c
And I'm not sure where the hashing algorithm for IPs is coming from,
especially those lines :

iphp->hash = 89;

hash = (hash * 113 + iphp->addr[i]) % 6271;

Just wondering if those constants are arbitrary chosen, or if there is
something there to guarantee a good distribution ?

If you have some links explaining this algorithm, it would be greatly
appreciated!
Also, how would you get a good distribution on IPv6. Maybe it would make
sense to use murmur ?

Thank you,

Matthieu.
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Subject Author Views Posted

IP Upstream Hash

Matthieu Tourne 2722 July 20, 2011 05:20PM

Re: IP Upstream Hash

chateau Xiao 876 July 20, 2011 11:14PM

Re: IP Upstream Hash

Igor Sysoev 1511 July 21, 2011 05:44AM

Re: IP Upstream Hash

chateau Xiao 818 August 03, 2011 09:48PM

Re: IP Upstream Hash

Oscar Fernandez 794 August 04, 2011 03:10AM

Re: IP Upstream Hash

Igor Sysoev 1179 August 04, 2011 07:12AM



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