RE: [gentoo-user] network transfer speed

[Raffaele BELARDI <raffaele.belardi@st.com>]

> -----Original Message-----
> From: thelma@sys-concept.com <thelma@sys-concept.com>
> Sent: Friday, January 15, 2021 07:57
> To: Gentoo mailing list <gentoo-user@lists.gentoo.org>
> Subject: [gentoo-user] network transfer speed
> 
> 
> On both of my systems the network card speed is showing 1000
> cat /sys/class/net/enp4s0/speed   1000
> 
> but when I do rsync larage file I only see about: 20 to 22MB/s On my home
> network I get about 110MB/s between PC's
> 
> Both PC's have SSD  and the swith is Gigabit (I think).
> How to find a the bottleneck?

If the PCs attached to the switch show 1000 then the switch _is_ gigabit.

On my 1Gb home network I have an FTP transfer speed between Gentoo PCs A and B of almost 900Mbps, the other way round is almost half of that. One difference between the two systems is the disk, A uses SATA-2 disk while B has SATA-3.

Does the 'B' in 110MB/s stand for byte? If so you have 880Mbps which is not bad, the problem probably lies somewhere else. Otherwise you could check the switch error count (if you have a managed switch) or the network card error count, just to ensure you don't have a cabling/connector problem.

Have you tried other transfer methods just for comparison? I think FTP is still the fastest way to transfer files, though insecure or inconvenient as it might be. I have no experience with rsync.

raffaele