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…ause ReadHeaderTimeoutServer and ReadTimeoutServer are not the right timeouts to use for a tcp queuerefactor: create metrics.NoMetrics to not have to check for nil accessing metrics.Metrics, this might be even an optimization because of omitting branches and compiler can likely figure out that we call an empty body function test: add good coverage for StackListener and a benchmark benchmark: stackListner and queueListener Signed-off-by: Sandor Szücs <sandor.szuecs@zalando.de>
Signed-off-by: Sandor Szücs <sandor.szuecs@zalando.de>
…tions Signed-off-by: Sandor Szücs <sandor.szuecs@zalando.de>
Signed-off-by: Sandor Szücs <sandor.szuecs@zalando.de>
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The goal is to simplify the code and use a simple stack data structure with a mutex instead of multiple chains of calls through channels, which all have a lock. We observed in lifo() filters that there is lock contention on high load that reduces linear scalability by number of cores on a single machine.
Here we use 2 goroutines for the TCP accept handler. One that accepts and push on stack and the other that is a throttled hot loop that does stack pop() and sends it to our internal Accept() via channel.