Re: [gentoo-user] network transfer speed

[thelma@sys-concept.com]

On 1/15/21 1:11 AM, Raffaele BELARDI wrote:
>> -----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

On a remote network I run ethtool on both cards and I got both 1000Mb/s speed

1.)
ethtool net0
Settings for net0:
	Supported ports: [ TP MII ]
	Supported link modes:   10baseT/Half 10baseT/Full 
	                        100baseT/Half 100baseT/Full 
	                        1000baseT/Half 1000baseT/Full 
	Supported pause frame use: No
	Supports auto-negotiation: Yes
	Advertised link modes:  10baseT/Half 10baseT/Full 
	                        100baseT/Half 100baseT/Full 
	                        1000baseT/Half 1000baseT/Full 
	Advertised pause frame use: Symmetric Receive-only
	Advertised auto-negotiation: Yes
	Link partner advertised link modes:  10baseT/Half 10baseT/Full 
	                                     100baseT/Half 100baseT/Full 
	                                     1000baseT/Full 
	Link partner advertised pause frame use: Symmetric
	Link partner advertised auto-negotiation: Yes
	Speed: 1000Mb/s
	Duplex: Full
        Port: MII
	PHYAD: 0
	Transceiver: internal
 	Auto-negotiation: on
	MDI-X: on (auto)

2.) 
ethtool enp4s0
Settings for enp4s0:
	Supported ports: [ TP ]
	Supported link modes:   10baseT/Half 10baseT/Full 
	                        100baseT/Half 100baseT/Full 
	                        1000baseT/Full 
	Supported pause frame use: Symmetric
	Supports auto-negotiation: Yes
	Advertised link modes:  10baseT/Half 10baseT/Full 
	                        100baseT/Half 100baseT/Full 
	                        1000baseT/Full 
	Advertised pause frame use: Symmetric
	Advertised auto-negotiation: Yes
	Speed: 1000Mb/s
	Duplex: Full
	Port: Twisted Pair
	PHYAD: 1
	Transceiver: internal
	Auto-negotiation: on
	MDI-X: on (auto)