All Posts by Date or last 15, 30, 90 or 180 days.
also by Lloyd: diglloyd.com photography and WindInMyFace.com
Thank you for purchasing through links and ads on this site.
OWC / MacSales.com...
diglloyd Deal Finder...
Buy other stuff at Amazon.com...
Capacities up to 48TB and speeds up to 1527MB/s

Does macOS 10.12.5 Break Gigabit Ethernet?

I wondered why my iMac 5K file sharing was so bad. It is on a gigabit ethernet switch like all my computers, all of which have run for years on gigabit.

There are other possible explanations perhaps, but unplugging/replugging the cable and rebooting the iMac did not help. Only when I manually configured ethernet on the iMac to use gigabit did it resume performing at gigabit speeds (100 megabytes a second or more).

The other symptom is no internet connection for 20 to 30 seconds. That I’ve seen before with the iMac 5K (and only the iMac 5K, my MBP and Mac Pro on the same switch are fine).

To be completely fair to the iMac and Apple, I’d have to try other cables direct to the gigabit switch. I did not have time to mess around with that today, but maybe a cable can just “go bad” sitting there—and after an OS release!

So if things seem slow over the network, check System preferences => Network => Advanced => Hardware and make sure you aren’t running at 1/10 speed.

macOS auto-detecting gigabit (1000 megabit) as 100 megabit (1/10 the speed)
B&H Deal ZoneDeals by Brand/Category/Savings
Deals expire in 9 hours unless noted. Certain deals may last longer.
$3097 SAVE $200 = 6.0% Nikon D850 DSLR in Cameras: DSLR
$1797 SAVE $200 = 10.0% Pentax K-1 Mark II DSLR in Cameras: DSLR
$998 SAVE $400 = 28.0% Sony a7 II Mirrorless in Cameras: Mirrorless
$1798 SAVE $200 = 10.0% Sony a7R II Mirrorless in Cameras: Mirrorless
$2798 SAVE $400 = 12.0% Sony a7R III Mirrorless in Cameras: Mirrorless
$3998 SAVE $500 = 11.0% Sony a9 Mirrorless in Cameras: Mirrorless

diglloyd.com | Terms of Use | PRIVACY POLICY
Contact | About Lloyd Chambers | Consulting | Photo Tours
Mailing Lists | RSS Feeds | Twitter
Copyright © 2019 diglloyd Inc, all rights reserved.
Display info: __RETINA_INFO_STATUS__