> The maximum length of the queue for incomplete sockets can be set using /proc/sys/net/ipv4/tcp_max_syn_backlog.
Yes, but:
* http://livegrep.com/search/linux?q=tcp_max_syn_backlog points to "sysctl_max_syn_backlog" variable
* http://livegrep.com/search/linux?q=sysctl_max_syn_backlog
* Which is used when the "syn backlog queue" or "request_sock_queue" in kernel nomenclature is created: https://github.com/torvalds/linux/blob/v3.17/net/core/reques...
But It's a max! The desired value is passed from:
* https://github.com/torvalds/linux/blob/v3.17/net/ipv4/inet_c...
* https://github.com/torvalds/linux/blob/v3.17/net/ipv4/af_ine...
IE: if you want to have big syn backlog you _MUST_ do two things:
* bump tcp_max_syn_backlog to 65535
* bump listen "Backlog" to 65535
Artur Bergman from fastly famously says that "tcp_max_syn_backlog" must not be greater than 65535, but I saw no evidence for that:
* https://www.youtube.com/watch?v=6UvK6BS42Jc#t=2036
> The maximum length of the queue for incomplete sockets can be set using /proc/sys/net/ipv4/tcp_max_syn_backlog.
Yes, but:
* http://livegrep.com/search/linux?q=tcp_max_syn_backlog points to "sysctl_max_syn_backlog" variable
* http://livegrep.com/search/linux?q=sysctl_max_syn_backlog
* Which is used when the "syn backlog queue" or "request_sock_queue" in kernel nomenclature is created: https://github.com/torvalds/linux/blob/v3.17/net/core/reques...
But It's a max! The desired value is passed from:
* https://github.com/torvalds/linux/blob/v3.17/net/ipv4/inet_c...
* https://github.com/torvalds/linux/blob/v3.17/net/ipv4/af_ine...
IE: if you want to have big syn backlog you _MUST_ do two things:
* bump tcp_max_syn_backlog to 65535
* bump listen "Backlog" to 65535
Artur Bergman from fastly famously says that "tcp_max_syn_backlog" must not be greater than 65535, but I saw no evidence for that:
* https://www.youtube.com/watch?v=6UvK6BS42Jc#t=2036