On Mon, Nov 25, 2013 at 04:30:36PM +0400, Alexander Pakhomov wrote: > Both should not load CPU a lot. But that doesn't mean they wouldn't. > Write here if notice intense interrupts CPU load. My OpenBSD 5.4 amd64 > laptop fail to handle 2 MB/s wifi due to some drivers issues (they > load CPU up to 100% interrupts). Additional info about interrupts > load would be helpful.
I didn't find anything really conclusive. Evidentally the main difference (http://supermicro.biz/support/faqs/faq.cfm?faq=11847) is that the 82574L is a fully separate ethernet interface connected over pcie, whereas the 82579LM is just a PHY that connects to the chipset controller. I found a couple anecdotal accounts that the 82579LM works better (such as http://us.battle.net/d3/en/forum/topic/5151718781), but that's under windows, and might just be driver issues. I think I'm just going to set up the 82579LM for the high load initially and see what happens; it will be easy enough to switch them around if I want to try the other way later.
