Re: [gentoo-user] network transfer speed

On 1/16/21 11:55 AM, Michael wrote:
> On Friday, 15 January 2021 22:43:36 GMT thelma@×××××××××××.com wrote:
>
>> The fact that I'm logged via ssh over VPN to a remote network should not
>> have any influence over network speed.
>
> It may influence speed if you're trying to push a large file through the
> tunnel.  TCP over TCP tends to choke due to retransmissions:
>
> http://sites.inka.de/bigred/devel/tcp-tcp.html
>
> Is the VPN you mention using a TCP or UDP tunnel?

The VPN is using UDP tunnel.
  
>
>> I just made a loop:
>> Network A ==> Internet ==> Network B
>> ssh back to Network A over internet and run "rsync" I got same speed (as if
>> I run the command locally) on Network A 112MB/s
>>
>> So the limiting factor is somewhere else.
>
> I'm sorry, but I fail to understand with any clarity what runs where and how
> when you test things locally, Vs remotely.  I mean:

What I did is log-in to a remote network over ssh, from remote network I logged back to my network PC using ssh and tested the transfer speed.
 
> - Network topology;
> - Network Protocols;
> - Applications & application protocols;
> - Relevant services on each peer;
> - Actions on each peer;
> - Results per action.
>
> As already mentioned iperf or netcat/telnet results will confirm if this is
> purely a network issue, ISPs performing deep packet inspection/throttling
> affecting throughput asymmetrically, etc.
>
> SSDs are typically faster than spinning disks, but not always as fast as
> ramdisks/tmpfs, especially if write amplification takes place, TRIM kicks in,
> etc.
>
> Stacking network + application protocols can also have an adverse effect.
> Applications like rsync which compare file names, sizes, hashes and what not,
> do not offer a reliable speed comparison.
>
> Methodically testing each component of the transmission system should get you
> an answer at the end.

On a remote network there are 5-pcs 
- two of them are Windows PC
- 3-pcs are Gentoo 

I was just testing Getnoo PC's
One small PC is about 20-30meters away from the switch and connected by CAT5 (or CAT5e)
that PC is network card is capable of 1000-speed according to "ethtool" but negotiated the speed of 100 according to:
/sys/class/net/enp4s0/speed

The 2-PCs closer to the switch, negotiated the speed of 1000 according to:
/sys/class/net/enpxxxx/speed

I have to check (this week) if they are both connected directly to a switch and or firewall Ausus RT-AC66U and the light on the switch. 
I'll check out/investigate the use of "net-misc/iperf" to check the speed.