Hi guys,
I'm running uTorrent 1.6.5 on a Macbook Air late 2012 with 8GB of RAM running OSX 10.8.2. While running uTorrent and downloading a few torrents I've noticed that my internet connection from that machine seems to drop out and fail to connect to websites and ping responses start to drop. I've limited the download and upload speed to roughly half my ADSL sync speed and the internet connection on other machines seems to be fine.
It's bringing back memories of running Windows XP and having to run the TCP patcher to increase the half open TCP connections setting. Is there some setting like that on a Mac that would limit the number of capable connections? I've found some information on the following page:
http://rolande.wordpress.com/2010/12/30/performance-tuning-the-network-stack-on-mac-osx-10-6/
and I've changed the following settings:
Johns-MacBook:~ root# cat /etc/sysctl.conf
kern.ipc.somaxconn=4096
kern.ipc.maxsockets=8000
kern.ipc.nmbclusters=32768
net.inet.tcp.sockthreshold=16
net.inet.tcp.sendspace=262144
net.inet.tcp.recvspace=262144
net.inet.tcp.delayed_ack=0
net.inet.tcp.slowstart_flightsize=4
net.inet.tcp.blackhole=2
net.inet.udp.blackhole=1
but there's still no real improvement.
By my reckoning, there's got to be something limiting the number of TCP connections on the mac where utorrent is running since the internet connection works fine on other machines connected via the same router.
Please don't post suggestions to limit the upload/download bandwidth since this isn't the problem a) because other computers on the same network work fine and b) because the bandwidth monitor on the router shows maximum bandwidth saturation at 40%. Is there some setting on mac's which limit the number of open tcp/udp sessions?
I've also tried transmission and I'm having the same issues with that too. If I run utorrent on a windows PC with the same sessions, I don't have these issues... This is really bugging me!
Has anyone got any ideas?
Thanks,
John
I'm running uTorrent 1.6.5 on a Macbook Air late 2012 with 8GB of RAM running OSX 10.8.2. While running uTorrent and downloading a few torrents I've noticed that my internet connection from that machine seems to drop out and fail to connect to websites and ping responses start to drop. I've limited the download and upload speed to roughly half my ADSL sync speed and the internet connection on other machines seems to be fine.
It's bringing back memories of running Windows XP and having to run the TCP patcher to increase the half open TCP connections setting. Is there some setting like that on a Mac that would limit the number of capable connections? I've found some information on the following page:
http://rolande.wordpress.com/2010/12/30/performance-tuning-the-network-stack-on-mac-osx-10-6/
and I've changed the following settings:
Johns-MacBook:~ root# cat /etc/sysctl.conf
kern.ipc.somaxconn=4096
kern.ipc.maxsockets=8000
kern.ipc.nmbclusters=32768
net.inet.tcp.sockthreshold=16
net.inet.tcp.sendspace=262144
net.inet.tcp.recvspace=262144
net.inet.tcp.delayed_ack=0
net.inet.tcp.slowstart_flightsize=4
net.inet.tcp.blackhole=2
net.inet.udp.blackhole=1
but there's still no real improvement.
By my reckoning, there's got to be something limiting the number of TCP connections on the mac where utorrent is running since the internet connection works fine on other machines connected via the same router.
Please don't post suggestions to limit the upload/download bandwidth since this isn't the problem a) because other computers on the same network work fine and b) because the bandwidth monitor on the router shows maximum bandwidth saturation at 40%. Is there some setting on mac's which limit the number of open tcp/udp sessions?
I've also tried transmission and I'm having the same issues with that too. If I run utorrent on a windows PC with the same sessions, I don't have these issues... This is really bugging me!
Has anyone got any ideas?
Thanks,
John
