Problems with XBT Tracker, a BitTorrent tracker

Question

I've been using XBT Tracker (a BitTorrent tracker). On Debian Lenny mostly. My problem is when the tracker reaches a given number of peers, it dies. There is no informative debug message, no dump, nothing. The last Windows release does mention a change which says it fixes this (I think that is the source of our problem), but since I run linux..

So.. What should I use? On which OS?

Answer 1

We've been using XBT Tracker (XBTT) on FreeBSD for quite a while. Now we have about 500k+ peers, and they are rapidly growing. And we have an announce interval of 700 second which is very low.

1. The only optimizations for XBT Tracker I've heard of in Linux are:

#Backlog
net.core.netdev_max_backlog = 4096
net.core.somaxconn = 4096

net.ipv4.ip_local_port_range="1024 65535"

net.ipv4.tcp_syncookies = 1

#Timewait sockets
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 1

#Firewall conntrack
net.ipv4.netfilter.ip_conntrack_max = 1048576
net.nf_conntrack_max = 1048576

Do not forget to increase maximum number of opened files:

ulimit -n 1000000

and save changes to limits.conf

2. Our XBT Tracker uses the patch Extended BitTorrent Client and Tracker

3. This configuration line can be helpful:

listen_check = 0

and also we have very short

read_files_interval = 2
write_db_interval = 3

4. MySQL tuning is required, as minimum you should increase

max_allowed_packet = 48M

PS. You can check out Extended BitTorrent Client and Tracker if nothing helps. But I didn't test it.