[Xen-users] Software Raid 5 domu performance drop

[braintorch <kkabardin@xxxxxxxxx>]

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?


Kirill

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