I can confirm this bug.
Unaware of this bug report, I came to the same conclusion today.
Googling "noop xen bug debian" led me to this bug report.
Before pvops kernel, -xen kernel set noop for domUs by default, while
pvops kernel sets cfq for domUs.
Severity of this bug is higher than "wishlist"
Package: xen-tools
Severity: wishlist
Hi
For virtual machines the Dom0 already does the IO scheduling. The DomUs
should use the simplest scheduling, namely noop. Anything else requires
advanced knowledge of IO schedulers and good coordination between the
schedulers in the Dom0, the DomUs and po
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