Comment 405 for bug 620074
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4d1350f
(Get the code!)
It would be ideal, if you could try 2.6.30 on the problematic server. I realize that this may not be easy, however there's not much I can do about a problem on an ancient kernel.
If you do try 2.6.30 and it also has the same problem, then I want you to capture some blktrace data of both deadline and cfq. Basically, right after you start the dd test, in another terminal do:
# cd /dev/shm; blktrace /dev/sda
and ctrl-c that blktrace after ~5 seconds or so. Then stop the dd as well. Save the blktrace files on the harddrive.
Now switch do deadline and repeat the exact same thing. Then tar up the two sets of files and attach them to this bug report.