Mac to PC gigabit networking

Toggle sidebar Toggle sidebar
D

drdwridav

Reputable
Mar 30, 2015
13
0
4,510
My setup is an Intel nuc with a gigabit thunderbolt adapter wired to router. Router is connected by Ethernet to another router to act as a switch. Attached to this is an iMac.
Transferring files from Mac to PC is fine (113 MB/s) so I'm getting gigabit speeds that way.
Transferring the other way I get just 18 MB/s
Any ideas what I could try? The only success I've just had is to change the Mac's network setting from automatic (1000 full duplex with flow control) to manual (just 1000 full duplex). This has actually improved the speed to 62 MB/s but not sure why!?!
Should i be disabling flow control? Will this cause any other issues? Is there anything else I could try on either computer??
 
Solution
jsmithepa


You are not happy that it works, you want to know why? :D

Throwing something at you but it's just a guess: The other adapter(s) on the chain doesn't support flow control, so a receiver waits (pauses) for acknowledgement (the basis for flow control) but never arrives, so at some point it times out, and instead of error-ing out, it just continues with the next block of data.
Sort by date Sort by votes
D

drdwridav

Reputable
Mar 30, 2015
13
0
4,510
Hi
The Mac doesn't have an SSD, it's a regular one. I also have two regular external hard drives connected to the Mac by thunderbolt (again not SSD). Whether it's to the internal or external, the speeds are the same
The NUC does have an SSD though...
 
Upvote 0 Downvote
jsmithepa

jsmithepa

Polypheme
Jun 14, 2014
13,096
263
60,840


Well there you are!

Your NUC as a fast bucket to store the received data and keep up, your Mac doesn't.
 
Upvote 0 Downvote
D

drdwridav

Reputable
Mar 30, 2015
13
0
4,510
Thanks, I understand that -- but can you shed any light on the flow control and why turning it off on the Mac's connection allows files to come in three times faster?
 
Upvote 0 Downvote
jsmithepa

jsmithepa

Polypheme
Jun 14, 2014
13,096
263
60,840


You are not happy that it works, you want to know why? :D

Throwing something at you but it's just a guess: The other adapter(s) on the chain doesn't support flow control, so a receiver waits (pauses) for acknowledgement (the basis for flow control) but never arrives, so at some point it times out, and instead of error-ing out, it just continues with the next block of data.
 
Upvote 0 Downvote
Solution
You must log in or register to reply here.

TRENDING THREADS

Latest posts

Moderators online

Share this page

COMPANY
RESOURCES
FOLLOW
Top Bottom