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I have an IBM x3650 M4 server (64-bit) running Ubuntu 13.04 Desktop (32-bit). I realize that this is a non-standard setup by it's being driven by other requirements. I am seeing slow file writes accross the board (to HDD, to USB, to network mount). The file writes seem to peek at 1.3Mb/s. The expected speed of my RAID setup is 180Mb/s.

Here's what I tried:

  1. Boot Live Ubuntu 11.10 64-bit. The file writes are as expected, 180Mb/s.
  2. Boot Live Ubuntu 13.04 32-bit. The file writes are slow, 1.3Mb/s.
  3. Boot Live Ubuntu 12.04 LTS 32-bit. The file writes are slow, 1.3Mb/s.
  4. Boot Live Fedora 19 32-bit. The files writes are again as expected, 180Mb/s.

At this point, it looks like something in the Ubuntu 13.04 32-bit kernel is not being configured correctly to work with the IBM hardware. Fedora 32-bit seems to work just fine.

Would anyone happen to know what could be causing this?

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Please list the filesystem (e.g. ext3 or ext4) for each along with the options (e.g. noatime) to make sure you are comparing apples to apples. –  HTTP500 Jul 29 '13 at 18:04
    
I'm sorry, I did not note any of that info. Live CDs were used with default options. –  Konstantin Klitenik Jul 29 '13 at 18:10
    
I suspect that write barriers are being sent where the performance is poor. –  HTTP500 Jul 29 '13 at 18:23
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