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Re: [Xen-users] poor I/O performance with PV drivers and I/O emu

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Subject: Re: [Xen-users] poor I/O performance with PV drivers and I/O emu
From: Tom Brown <xensource.com@xxxxxxxxxxxxxxxxxxx>
Date: Wed, 15 Apr 2009 10:12:43 -0700 (PDT)
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On Wed, 15 Apr 2009, Riccardo Veraldi wrote:


Sequential output around 4MB/s, Sequential input about 50MB/s

a 12 to 1 ratio in read to write speed is probably NOT related to your drivers... drivers should have aproximately the same overhead on a read or a write. I would guess that there is something strange in your actual storage. I think you need to benchmark /dev/VolGroup00/test-1_disk from dom0 and figure out what your I/O system is capable of.


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