So what's going to be the performance impact of setting "vfs.zfs.arc_max" to 1024MB on a system that's running great out of the box right now? Currently my system returns "vfs.zfs.arc_max: 7228235776" on 8.0.2 AMD64 build.
Personally (and I don't mean to sound like an ass about it) I'd object to anything that going to cost me performance just to make FreeNAS work better on gear that doesn't meet the published minimum specs. That said, I think it would be worthwhile to include something like the "zfskerntune" extension (http://sourceforge.net/apps/phpbb/fr...it=zfskerntune) that daoyama wrote for FreeNAS 0.7.X to make tuning easier for everyone or perhaps there could be a "tuning" section added to the docs with some known good settings & clear instructions that users could add to cut down on the "I found some setting in a post somewhere that seem to work ok except for when I ...." problems.
Also, earlier in the thread I suggested bumping the image size from 2000MB to something like 3500MB. I didn't make the suggestion because I want to to add packages (I'm a strict the NAS is a NAS kind of guy), I made it because I see a lot of folks in the IRC channel having trouble because the current image is just a hair to big to fit on many 2GB USB keys. It would be equally effective to decrease the image size just a bit so it will be small enough to go on a 2GB key that's really 1.9GB. Currently I just advise them to get a 4GB key for $5.00 and it almost always resolves the weird boot problems they are seeing, but there is sometimes some grumbling about reality not matching the published requirements.