FileZilla Forums

Hi,

I've got a VM running Xubuntu 20.04 and I also have a cloud server with a full duplex 1GB network connection. My ISP connection is 600Mbps

When I download a file from the cloud server using Filezilla it never goes about 7.5 MB/s. If I increase the concurrent downloads I can have 4 or 5 files all coming down at 7.5 MB/s but never more.

If I open up a Terminal and use the OS sftp command to download, I see between 55 - 60 MB/s.

Any ideas why Filezilla is going so slow?

Thanks

Check your sysctl knobs, your memory limits are too small. The defaults for net.ipv4.tcp_mem and net.ipv4.tcp_rmem are not suitable for modern day networks. There's also an odd behavior in the kernel where a request for a large buffer actually decreases the window scale factor from the default.

botg wrote: ↑

2020-05-18 08:24

Check your sysctl knobs, your memory limits are too small. The defaults for net.ipv4.tcp_mem and net.ipv4.tcp_rmem are not suitable for modern day networks. There's also an odd behavior in the kernel where a request for a large buffer actually decreases the window scale factor from the default.

Thanks Botg, will check them out!