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NVMe bare metal vs VM

Coffee
in VM Engine (KVM)

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I found the performance of NVMe is not good when it compare with bare metal, even the controller of NVMe is passed through to VM. Is anyone who can reach at least 80% performance of the bare metal?

 

IOMMU group 12:[126f:2262] 01:00.0 Non-Volatile memory controller: Silicon Motion, Inc. Device 2262 (rev 03)

 

<hostdev mode='subsystem' type='pci' managed='yes'>
      <source>
        <address domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
      </source>

 </hostdev>

 

CrystalDiskMark 6.0.2 x64

Bare metal performance (Read/Write)

Seq Q32T1 3491.1 / 3249.1

4KiB Q8T8 1331.5 / 1485.3

4KiB Q32T1 554.2 / 380.1

4KiB Q1T1 71.90 / 231.5

 

VM Window 10 (Read/Write)

Seq Q32T1 3247.5 / 2405.9

4KiB Q8T8 620.6 / 423.4

4KiB Q32T1 121.6 / 75.35

4KiB Q1T1 33.62 / 75.25

 

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