I have been using UnRaid for several months with no issues, but after upgrade to 4.3.3 (from previous 4.2.x) a problem have begun to show. When watching video sometimes it freezes for some time from just a moment to tens of seconds. I thought the problem is with the network, but at the same time I can not communicate with the server at all (even Windows explores is frozen) I have <1ms pings from my server.

So I dug little deeper and realize that when a freeze occurs there is an error in the syslog, which looks like this:

 

Oct  4 14:58:52 StorageServer kernel: APIC error on CPU0: 00(40)

 

And as freezes are getting more and more frequent (and longer) there is more and more of these. It also looks like with longer server uptime more of these are showing.

 

I've done some research and it is a known problem with Linux kernel, but I can not use the recommended workaround, because the workaround is to turn off UP_IOAPIC in kernel, which I can not do as this is not a normal Linux distribution, but unRAID.

 

Any idea how to deal with it or maybe even patch in some future release?

 

Hardware info: Asus M3A-H/HDMI motherboard, AMD Athlon AM2.

Edit the syslinux.cfg file on the flash, and put "noapic" on the kernel command line.