Test ethernet cable speed mac

Grab the IP address.

If you click on the Advanced button, you'll find a set of tab for more options. Under the Bridge Status tabm you can see if your Thunderbolt connection is active. A message will pop up asking you to type in the user name and password for the shared system.

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Enter that info and pick the volume you want to mount and click OK. When we tested two new Mac Pros over a gigabit network connection with a standard ethernet cable, we saw read and write speeds of a 10GB file of just below MBps. When we copied a set of smaller files and folders, we saw read speeds of 78 MBps and write speeds of 64 MBps. We saw an increase in file transfer speed when we disconnected the ethernet connection and used IP over Thunderbolt. The 10GB file write was about 6 percent slower on the external drive share, while reads were about 12 percent slower.

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Reading files and folders was a little more than 10 percent slower on the external share and writing files and folders was about 25 percent slower than testing a shared folder residing on one of the Mac Pros. Of course, you can always copy files from one Thunderbolt-equipped Mac to another using Target Disk Mode. When we ran our tests under that setup, all results were faster than the IP over Thunderbolt transfer speeds. The 10GB file reads and writes were about 7 percent faster; the files and folders read test results were 21 percent faster, while the write test results wear 83 percent faster.

The downside of this configuration is that you have to boot one of the computers into Target Disk Mode, making it essentially an external drive and unusable as a computer.


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Our final test was connecting the LaCie to the test Mac Pro directly over Thunderbolt and running the benchmarks again. This configuration was, by far, the fastest we tested. The 10GB file write speeds were nearly double those of the closest configuration, the Thunderbolt Target Disk Mode, and the read speeds were 55 percent faster than Target Disk Mode.

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The files and folders results were 59 percent faster write and 77 percent faster read. Results are in MBps. Testing performed on a pair of late Mac Pros. I have verified this effect multiple times now… several times by accident and once to validate the reality. If you open the network preferences you can choose which one is on top, but… it makes no difference. I plug the ethernet cable in… wait till the network preference shows a connection and the ethernet is on top… then I drag and drop a bunch of files of 2 or 3 GB and voila, it is still going through wifi.

If you are wondering perhaps I should give it more time to figure it out.

My Mac Mini had its wifi turned on after I used the migration assistant the tool that copies my user data and apps over to my new Mac. This was where I noticed the use of the wifi even though my gigabit ethernet is permanently connected. Priorities shows ethernet over wifi. Not always. Even seen it happen when there are two Ethernet ports are connected to the same network and on the same subnet.

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Ethernet physical layer

It is SOP to keep the Wi-Fi circuit turned off when using wired connection for all kinds of reasons One or the other but not both. Apple encourages you do just that go wifi AC.

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Now back to the ethernet cable. They do this with the iPhone where if your wifi is weak it will use your 4G. I do see a lot of Apple users complaining about their time machine speeds and I suspect that they are backing up their macs via wifi and if they do plug in a cable thinking that it should give them gigabit speeds, they might be surprised like I was that gigabit is not automatic. I have one of the highest speed internet connections, and get up to Mbps on speedtest. So, yes, I have gigabit network speed and know it. Which brings me to say: if I had an Apple laptop it would be wired, not wireless, most of the time, unless I could prove to myself that a wireless connection is faster.

They renumber my lists, so I have to have some text in between lists otherwise it goes from 1 to One thing that may be different with other users is that my Cloud is semi permanently mapped, whether it is on Wifi or Ethernet thus it may have a preference to stay with the last known connection.


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  • Thus pulling it off my desktop connections will automatically switch it to Wifi since the ethernet connection is no longer there. It does stay on the ethernet if I turn Wifi back on.