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fc630bd373
By picking two randoms following the P2C algorithm, we seldom observe asymmetric loads on bursts of small session counts. This is typically what makes h2load take a bit of time to complete the last 100% because if a thread gets two connections while the other ones only have one, it takes twice the time to complete its work. This patch proposes a modification of the p2c algorithm which seems more suitable to this case : it mixes a rotating index with a random. This way, we're certain that all threads are consulted in turn and at the same time we're not forced to use the ones we're giving a chance. This significantly increases the traffic rate. Now h2load shows faster completion and the average request rates on H2 and the TLS resume rate increases by a bit more than 5% compared to pure p2c. The index was placed into the struct bind_conf because 1) it's faster there and it's the best place to optimally distribute traffic among a group of listeners. It's the only runtime-modified element there and it will be quite cache-hot.