I have not been able to get any of the 2.6.15-rc5-rt series to boot on my older dual 933. I am attaching a log of the failed boot of 2.6.15-rc5-rt2 with Steven's RWSEM_XCHGADD_ALGORITHM patch to get it to build as well as his slab patch (wouldn't boot without this either). I am also attaching my .config. This boots fine on my slower uniprocessor box. Any ideas? -- kr