network saturated overnight?
Firstly my MTU is set to 1500 by default. Should I drop that down to 1430? Or doesn't it matter?
I tried tweaking the RWIN using your video guide but I managed to drop the speed down to 60KB/s.
I'm running Ubuntu here so I guess the numbers you need to calculate are somewhat different. I found a guide on ubuntuforums.org and used the following settings:
#increase TCP maximum buffer size
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
# increase linux autotuning TCP buffer limits
net.ipv4.tcp_rmem = 4096 87380 16777216
net.ipv4.tcp_wmem = 4096 65536 16777216
# don't cache ssthresh from previous connection
net.ipv4.tcp_no_metrics_save = 1
# recommended to increase this for 1000 BT or higher
net.core.netdev_max_backlog = 2500
net.ipv4.tcp_timestamps = 0
net.ipv4.tcp_sack =1
net.ipv4.tcp_window_scaling = 1
I've never had much success tweaking RWIN/MTU in the past so I always dread it when someone suggests changing these numbers. But my speeds are now back up to a number far closer to the BT Speedtest. I'll see if this holds up.
I tried tweaking the RWIN using your video guide but I managed to drop the speed down to 60KB/s.
I'm running Ubuntu here so I guess the numbers you need to calculate are somewhat different. I found a guide on ubuntuforums.org and used the following settings:
#increase TCP maximum buffer size
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
# increase linux autotuning TCP buffer limits
net.ipv4.tcp_rmem = 4096 87380 16777216
net.ipv4.tcp_wmem = 4096 65536 16777216
# don't cache ssthresh from previous connection
net.ipv4.tcp_no_metrics_save = 1
# recommended to increase this for 1000 BT or higher
net.core.netdev_max_backlog = 2500
net.ipv4.tcp_timestamps = 0
net.ipv4.tcp_sack =1
net.ipv4.tcp_window_scaling = 1
I've never had much success tweaking RWIN/MTU in the past so I always dread it when someone suggests changing these numbers. But my speeds are now back up to a number far closer to the BT Speedtest. I'll see if this holds up.
Quote from: joeybutterface DSL connection rate: 832 kbps(UP-STREAM) 8096 kbps(DOWN-STREAM)
Actual IP throughput achieved during the test was - 6384 kbps
Why is the IP profile set to 7000 kbps? I should be able to achieve the maximum on my line. It's right next to the exchange and the line stats were described as exceptional when I signed up.
According to the tables your sync speed needs to be 8128.
Quote from: Jameseh Hiya,
That's basically because you have interleaving applied to your line, resulting in you losing approximately ~100Kbps of throughput.
Could you please explain, 6384 + 100 not= 7000! When you say throughput, is that just the achieved download speed or does it affect the profile as well? Thanks.