tree 59436313896cee1e2835a4095b43ecaaea50daf9
parent b1f48e316149cacc91c63a2878ab170e59d579e6
author Andrew Rodland <andrewr@vimeo.com> 1477414185 -0400
committer Willy Tarreau <w@1wt.eu> 1477419692 +0200
encoding latin1

MINOR: server: compute a "cumulative weight" to allow chash balancing to hit its target

For active servers, this is the sum of the eweights of all active
servers before this one in the backend, and
[srv->cumulative_weight .. srv_cumulative_weight + srv_eweight) is a
space occupied by this server in the range [0 .. lbprm.tot_wact), and
likewise for backup servers with tot_wbck. This allows choosing a
server or a range of servers proportional to their weight, by simple
integer comparison.

Signed-off-by: Andrew Rodland <andrewr@vimeo.com>