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I found some nice information about tuning FeeeNAS 7.x from a few sources last week.

A blog post HERE made by Learned By Error details some settings to use for tuning FreeNAS for increased network performance. That post combined with information from the FreeBSD Wiki article called ZFS Tuning Guide and a U.S. Department of Energy article called TCP Tuning Guide – FreeBSD Tuning helped me determine the optimal tuning settings for my system. Prior to the TCP settings I was only getting around 25-30 MBps between my PC and the server. Now, with the new settings, I am getting up to 80-90 MBps (bursts) with common speeds of 55-60 MBps.

Here are the settings I currently have under System -> Advanced -> sysctl.conf

Well, I deviated slightly from my previous home server plans. I am using FreeNAS (based on FreeBSD) as the operating system which runs from a USB Flash Drive. The storage drives are arranged using the ZFS file system which has very high performance and redundancy. The software includes Samba support which allowed me to configure it to use Active Directory integration for access control. All in all I am very impressed with the performance of this free open-source software. It does take some technical know-how to configure correctly for optimum performance but I wouldn’t have it any other way