inappropriate power management settings cause delays in packet handling, it will make the network appear to be congested.
Why this packet handling problem (if this is a case) is only in local connection, not in internet traffic? My inet connection allows to 40Mbps DL and this works as promised. If I connect to old 10.6.8 machine, this connection works too, but seems that speed is only 100T range, not 1000T. If I connect with SMB, between two Sierras I can't connect at all. Only with AFP. Connection to 10.6.8 is AFP too.
My machines are very ancient indeed - with s775 and s1155, but I need 10.6.8 and even 10.5.8 because of some specific software. I am not sportsmen, so I not need maximum in everything. I am 50 years old now, so gaming is not for me anymore .
TSO... How I disable TCP segmentation offload in Sierra?
Ok, found a way to edit. I disabled EEE, TSO for ipv4 and ipv6 and... file transfer stalled from ca10% of file size: file was 9,66GB and transfer goes to 906MB, then finito.
If I wrote "without webdriver", then it need to be a built-in driver, built-in to Sierra or Clover (v3766). I not installed any graphic options or driver at all. If someone shows how to look what specific driver is used, then I look.
I have GT710 in my computer, and for me it works without webdriver (!), 4K and Metal frameworks is supported. Only one bad things, 4K is supported max 30Hz, not 60Hz.
For that, I needed to install with Clover (v3766 at least) and with... another card, Radeon HD6450. Installing directly with GT710, I got only basic resolutions, no transparency and no Metal framework support, weird flickering in booting stages. Btw, HD6450 works very smooth, only without Metal frameworks, transparency is there.
After installing with HD6450, I replaced this card with GT710 and all is good.
All this is for Sierra, from first to 10.12.3 version ( I tried all updates in row). I don't know how ElCap or older OS'es reacts.
For one machine I keep HD6450, because with that card I have dual boot, Sierra and Snow Leopard in one, GT710 not work with Snow.
I installed two Sierra computers, both with RTL8168/8111 and with v2.2.1. drivers internet works, thanks. Weird thing is that local network transfer speed is very slow, about 11-15KB only. If connection goes to internet, speed is like supposed to be.
I am not sure about drivers problem, but something is like blocking LAN networking. All adresses is fixed, any energy-saver in network drivers is disabled. Previous machines with 10.6.8 or 10.9.5 works very well, network topology is exactly the same (1000baseT for all machines). Maybe someone has dealed with this problem before?