Has the system unresponsiveness problem during high disk I/O with the linux kernel been fixed?

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http://serverfault.com – Does anyone know whats happened to the kernel thus far since this thread http://unix.stackexchange.com/questions/5565/whats-the-progress-regardin... ? I'm running 2.6.34 and I'm constantly having this problem so I'm wondering which kernel in the 2.6 branch is best to upgrade to. (HowTos)