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[Xen-users] Software Raid 5 domu performance drop

Hello. I'm experiencing solid I/O performance drop when using software raid 5 from PV DomU. I can get about 420M/s for sequential reads and ~220 M/s for sequential writes when using it from Dom0. But it's only ~170 M/s for read and ~80 M/s for write when using it from DomU.

DomU performance for single drive is close to native â ~160 M/s for reads and ~160 for writes.

There is no filesystem or LVM, just raw data. Debian wheezy x86_64 for both Dom0 and DomU. And "phy" backend is used to attach drive to DomU.
Is this a bug or something wrong with my setup? What should I check?


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