Noticed a few weeks ago that Parallels (Windows 8.1) is causing my WiFi throughput speeds to slow down, especially when waking my machine from sleep. As soon as I exit Parallels completely, speeds resume. There is nothing abnormal running that I can find. I restart Parallels, everything is OK, but if I wake my machine from sleep, it slows back down (usually). Thoughts?
That has nothing to do with my issue. Both my Mac and Virtual Machine connect; but something is causing it to slow down my connection on a wake from sleep. May have started after the last Parallels update.
Hi, Most likely it is the problem with Mac OS's discoveryd. The issue is described for example in the article https://medium.com/@mariociabarra/wifried-ios-8-wifi-performance-issues-3029a164ce94 Afaik, the upcoming Mac OS 10.11 will have this fixed. Somehow Parallels triggers this bug. Unfortunately we don't have a fix at the moment. The workaround is to disable awdl0 network interface with the next action: Open the /Applications/Utilities/Terminal and execute in it the command "sudo ifconfig awdl0 down" it will ask for the password. Please type it and hit enter.
Interesting because I just updated to 10.10.4 which no longer uses discoveryd and the issue still persists. Like I mentioned, the issue ONLY occurs when I wake the Mac from sleep with Parallels still open. As soon as I kill Parallels, the speeds return to normal even when I restart Parallels.
Elric - thank you, thank you, thank you. Bought a brand new Mac Book Pro 3 weeks ago. Wifi was intermittently dropping from 150 Mbps down to 1-5 Mbps making it unusable. Tried everything via Apple Support, indeed Apple actually replaced my Mac Book Pro.... only for the same problem to return. Eventually worked out that whenever Parallels was open (Windows 7 Pro), if I put it to sleep, and woke it again, Wifi in both the host and VM would drop to 100 x slower. After trying "sudo ifconfig awdl0 down" I have for the first time managed to recover from sleep without the Wifi going 100x slower! Hope it continues to work, will post back if it doesn't!
I also updated to 10.10.4 on the advice of Apple Support with the same problem as you (but running Windows 7 Pro) - the "sudo ifconfig awdl0 down" appears to have fixed the problem for me - have you tried this?
Yes I have tried it and it seems to may have worked. I am out of town on my friends 50mbit connection with no issues when waking from sleep. When I get back home tomorrow, I'll be able to further test at home since my 30mbit bursts to 100mbit (which I can't do when the problem occurs).
