I'm at a loss and I've scoured the internet for answers, but none of them seem to work. I have a TP-LINK TL-SG108E 8 Port Gigabit Easy Smart Switch, a desktop, a laptop, and my new Synology 918+ that I just set up, all connected through the switch. The switch is then connected to an Amplifi router, but I'm not transferring anything to the router, I just mention it to give a complete picture. The desktop and laptop are both Windows 10.
My desktop has a 1gb ethernet connection, and it is connected at 1000 full duplex. TCP checksums offload are disabled.
My laptop has a 1gb Intel 82579 internal network adapter, and it's connected at 1000 full duplex. My 918+ has whatever adapter it has, and it is connected at 1000 full. I look on my switch, and all ports are negotiated for 1000 full. MTU's are the default 1500 everywhere I can check them.
When I copy files, the highest speed I ever get is 10 or 11 mb/s. When I'm transferring from my laptop to my desktop I don't mind that much and I've learned to live with it, but I just got this NAS and I'm going to be transferring like 10TB of data to it, and I can't have it going at 10mb/s.
I should be getting close to 100, especially with just these couple devices, and less than 10' of cable between the device and the switch. Doing searches on the internet there's many many people that have this issue, but there are few resolutions.
I'm hoping to get some ideas here.
Best Answer
Do you by chance have HP computers? There are several things that I have seen here that could be your problem. I'll run down a list (I'll try them in most likely to least likely based on what you said):
1) Quite a few HP laptops (and others) have these weird software programs installed from the factory called things like "Network Management" or "Quality of Service" or something like that. Uninstall all of them. They can turn your gigabit wired cards down to ULTRA slow speeds because they think they're being helpful. I've seen it bunches of times.
2) Those little external USB 3.0 things can sometimes not actually be gigabit even though they say gigabit. There are even some crummy computers that are those Intel 825** where they have "built in gigabit" but the CPU is so slow that they can't even pull 1g. I have replaced some computers for exactly that issue. They're a weird "Celeron" or an "APU".
3) Your switch could be broken? Have you tried another switch or a crossover cable or just using the router?
4) Have you tested the capability of the desktop/laptop to copy to itself locally? Can one or both of them not copy data very quickly WITHOUT using the network at all?
5) Some kind of weirdo ipv6 issue. I see this issue periodically as well. Some of the newer routers sloppily implement ipv6 and if you turn it off on your Windows box, things speed up magically.