Comment 154 for bug 620074

Well, I'm fairly certain at least part of the issue is a scheduler bug. Just now I was make module_install'ing a few kernels and after some time found that specific processes had stopped responding. This pattern continued, with more and more processes blocking. Eventually the entire X session stopped responding. For a while I could maintain an SSH session and found that IO wait time was 40%, with the rest of the CPU time going idle. After some time, however, even the ssh session stopped responding. This is the third time I have seen behavior like this, with the previous instances involving copying 15GB of data between external hard drives.

Also, Jens, what do you think is the most useful benchmark we've seen here? Testers have used several benchmarks including dd, various fio jobs. Would it help if we standardized on a single benchmark?