SO_REUSEPORT

[Qarasique]

Does the blocky have SO_REUSEPORT support ? (for more performance)

[0xERR0R]

The underlying dns library has support for port reusage, it this case SO_REUSEPORT will be set. This feature is currently is not used in blocky. I'll try it out and will do some performance checks

[ThinkChaos]

I don't think SO_REUSEPORT has a direct perfomance impact.
Maybe @Qarasique wants to run two instances? But I don't see why that'd improve performance either.

[0xERR0R]

There is some interesting information miekg/dns#654 (and also linked pr). I think it could improve performance on high load

[ThinkChaos]

Yeah the main thing there is increasing concurrency with more goroutines and parallelism with more cores, and indeed SO_REUSEPORT allows that easily.
I meant SO_REUSEPORT, the socket option, itself doesn't change anything.

I'm all for having a setting to set the number of goroutines, with a dynamic default.

[Qarasique]

I thought that we could achieve the effect like in this Nginx's blog post and pr above
Maybe usage of so_reuseport will low latency of concurrent queries

[0xERR0R]

I'm all for having a setting to set the number of goroutines, with a dynamic default.

Currently, each incoming request spawns a new goroutine. So basically, there is no limit. I'm thinking about introducing a limit of concurrent requests. For systems under load it could be better to limit a number of concurrent goroutines (incoming requests) to avoid starvations.