53772f5320
This patch adds a few optimizations when using the amphora driver. 1. It increases the amp_active_retries from 10 to 30. This increases the time we wait for nova to mark an instance "ACTIVE". The old default of 10 was one minute forty seconds, but in some clouds it's been observed that the nova schedule can get overloaded and take longer than a minute forty to schedule the instance. Setting this to 30 means we will wait five minutes for nova to schedule the instance. 2. It enables TCP kernel splicing in HAProxy. This has been shown to reduce the CPU overhead for very high rate TCP load balancers. 3. Finally it enables "safe" HTTP keepalives on the backend member connections [1]. This increases the request rate possible while using HTTP protocol listeners and members. [1] http://cbonte.github.io/haproxy-dconv/1.6/configuration.html#4-http-reuse Change-Id: I3af009cac9a9edc8aef793b52c6a1488fde2c59b |
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