It’s bizarre how a great operating system like OSX would have such a massive, but simple to fix issue.
I noticed recently when trying to move several large files across a samba/cifs share that it was painfully slow. In some cases, large files were about as slow as I would expect to see going across a dial up modem connection.
To fix this issue you will need to create a file under /etc/ called sysctl.conf. Then add a single line to it like this: net.inet.tcp.delayed_ack=0
To do this in one easy step, you can just do this…
1. Open a terminal window.
2. Type in: sudo echo “net.inet.tcp.delayed_ack=0” > /etc/sysctl.conf
The difference is amazing.
Hey, Apple! Make this a default change in your next release! Or maybe a bug fix?
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