Yes the 2.6.27 kernel was self built, and it works fine. The 2.6.29 was built using the .config file from the 2.6.27.
I compiled this kernel on two servers, both same spec (well, one has 4GB ram other has 2GB ram), same setup - and both responded as above.
On the one, I recompiled the kernel to just use the new version (NO config changes). The other I re-compiled using config changes (removing things not relevant for the machine etc) - both end up having this problem.
I have done a "diff" compare on the configs, but there is nothing I can find that would explain this.
I know that this "IRQF_DISABLED" warning isn't present in 2.6.27 boots, and that the CISS driver works full speed in that one.
I thought it was originally that I changed the IO Scheduling, but as i said, on the one machine - all i did was copy the config file and recompile.
Do you know of anything that could be causing this?
I checked proc/interrupts on both kernel versions, and IRQ 30 is unshared (IO-APIC-FASTEOI cciss or something like that), i am just unsure what is causing the issue.