Re: TCP_USER_TIMEOUT, SYN-SENT and tcp_syn_retries

2019-09-26 Thread Eric Dumazet
On 9/26/19 9:57 AM, Eric Dumazet wrote: > > > On 9/26/19 9:46 AM, Eric Dumazet wrote: >> >> >> On 9/26/19 8:05 AM, Eric Dumazet wrote: >>> >>> >>> On 9/25/19 1:46 AM, Marek Majkowski wrote: Hello my favorite mailing list! Recently I've been looking into TCP_USER_TIMEOUT and noti

Re: TCP_USER_TIMEOUT, SYN-SENT and tcp_syn_retries

2019-09-26 Thread Eric Dumazet
On 9/26/19 9:46 AM, Eric Dumazet wrote: > > > On 9/26/19 8:05 AM, Eric Dumazet wrote: >> >> >> On 9/25/19 1:46 AM, Marek Majkowski wrote: >>> Hello my favorite mailing list! >>> >>> Recently I've been looking into TCP_USER_TIMEOUT and noticed some >>> strange behaviour on fresh sockets in SYN-

Re: TCP_USER_TIMEOUT, SYN-SENT and tcp_syn_retries

2019-09-26 Thread Eric Dumazet
On 9/26/19 8:05 AM, Eric Dumazet wrote: > > > On 9/25/19 1:46 AM, Marek Majkowski wrote: >> Hello my favorite mailing list! >> >> Recently I've been looking into TCP_USER_TIMEOUT and noticed some >> strange behaviour on fresh sockets in SYN-SENT state. Full writeup: >> https://blog.cloudflare.

Re: TCP_USER_TIMEOUT, SYN-SENT and tcp_syn_retries

2019-09-26 Thread Eric Dumazet
On 9/25/19 1:46 AM, Marek Majkowski wrote: > Hello my favorite mailing list! > > Recently I've been looking into TCP_USER_TIMEOUT and noticed some > strange behaviour on fresh sockets in SYN-SENT state. Full writeup: > https://blog.cloudflare.com/when-tcp-sockets-refuse-to-die/ > > Here's a re

TCP_USER_TIMEOUT, SYN-SENT and tcp_syn_retries

2019-09-25 Thread Marek Majkowski
Hello my favorite mailing list! Recently I've been looking into TCP_USER_TIMEOUT and noticed some strange behaviour on fresh sockets in SYN-SENT state. Full writeup: https://blog.cloudflare.com/when-tcp-sockets-refuse-to-die/ Here's a reproducer. It does a simple thing: sets TCP_USER_TIMEOUT and