Seedbox crumbling under load?

**DutchRuff** · October 9th, 2011

I am quite stunned and thay why I'm posting here. For almost a year now, I'm running 2 EG AMD's from OVH... Both got a 6-core AMD-CPU and 16GB RAM and were manually installed with software RAID-0 and Debian 6. On top of that, manual install of rtorrent and rutorrent, basically compiled from the various tutorials on this site. Got a few cron-jobs running to update the kernel where needed, clean up logs and such but no big deal.

For some reason, unknown to me, one of the machines is recently acting up under load by which I mean having more than 200 loaded torrents, maybe 30-40 transferring data and 1-3 torrents downloading. Where machineA will easily do 50MB/s incoming and 30MB/s outgoing, machineB will either accept high incoming OR high outgoing but not both at the same time. And when I use 'top' to check the memory, machineB has got a tremendous amount of 'cached' in use where machineA hasn't. Tried recompiling the entire rtorrent-installation but to no vain. Tried diminishing the rtorrent.rc but also no use. Booted in rescue-mode and no errors found. So, not to compromise the current installs, I executed my own install.sh on a virtual machine at home. Although I can only test with smaller amounts of active torrents, the install seems allright since it doesnt start filling up 'cached' here as well.

top - 10:46:51 up 23 min, 2 users, load average: 0.31, 0.30, 0.25
Tasks: 119 total, 1 running, 118 sleeping, 0 stopped, 0 zombie
Cpu(s): 2.6%us, 1.2%sy, 0.0%ni, 94.2%id, 1.4%wa, 0.0%hi, 0.6%si, 0.0%st
Mem: 16460764k total, 11077088k used, 5383676k free, 7612k buffers
Swap: 61437936k total, 0k used, 61437936k free, 10491984k cached

Can anyone give me some pointers where to look or, if needed, I can post some config-files from the machine to help troubleshoot the system.

**DutchRuff** · October 11th, 2011

^ bump

I edited my rtorrent.rc a bit and the servers seems to calmed and regular outgoing speeds seems to have picked up a little; yet the cached amount is still insane and not sure where to look.

# PEER SETTINGS #
throttle.min_peers.normal.set = 15
throttle.max_peers.normal.set = 90
throttle.min_peers.seed.set = 30
throttle.max_peers.seed.set = 90
throttle.max_uploads.set = 125
throttle.global_down.max_rate.set_kb = 100000
throttle.global_up.max_rate.set_kb = 100000
trackers.numwant.set = -1

# DIRECTORIES #
directory.default.set = /home/DutchRuff/rt-downloads/
session.path.set = /home/DutchRufft/.session
schedule = watch_directory,5,5,load.start=/home/DutchRuff/rt-watch/*.torrent
schedule = untied_directory,5,5,stop_untied=

# NETWORKING #
network.port_range.set = 55995-56000
port_random = yes
network.scgi.open_port = 127.0.0.1:5000
protocol.encryption.set = allow_incoming,enable_retry,prefer_plaintext
dht.mode.set = disable
protocol.pex.set = no
network.send_buffer.size.set = 2M
network.receive_buffer.size.set = 262144
network.max_open_sockets.set = 1024
network.xmlrpc.size_limit.set = 4194304
#network.max_open_files.set = 1024

# MEMORY SETTINGS #
pieces.hash.on_completion.set = no
system.hash.read_ahead.set = 16
system.hash.interval.set = 40
system.hash.max_tries.set = 1
pieces.memory.max.set = 3221225472
pieces.preload.type.set = 1

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