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[Xen-users] Disk i/o on Dom0 suddenly too slow

Until now, things were fine but today while doing a regular lvm
snapshot backup, I noticed a huge lag in I/O.

Whenever i ran dd on dom0, the load on Linux domUs increased to high values.

A simple read/write test on Dom0 showed the speed of 1.2 MB/s.

# dd if=/dev/zero of=./test bs=1k count=1048576
545259520 bytes (520 MB) copied, 402.32934 seconds, 1.3 MB/s

Running Xen 4.2.1.

Has anyone noticed anything similar?

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