I just uploaded the qemu 1.7 package with new backup patches:
You should be able to install with:
# wget ftp://download.proxmox.com/tmp/pve-libspice-server1_0.12.4-3_amd64.deb
# wget ftp://download.proxmox.com/tmp/pve-qemu-kvm_1.7-2_amd64.deb
# dpkg -i pve-libspice-server1_0.12.4-3_amd64.deb pve-qemu-kvm_1.7-2_amd64.deb
Please can you re-run your tests?
Same host and guest as before.
Backup command, XXXXX was replaced with various values:
vzdump 108 -stdout|cstream -t XXXXX > /dev/null
Used dd to read in the VM:
dd if=/dev/vdb of=/dev/null bs=1M count=8192 skip=24000
cstream | dd read | improvement
140000000 | 128 MB/s | +19.0 MB/s
120000000 | 130 MB/s | +34.4 MB/s
100000000 | 129 MB/s | +48.7 MB/s
80000000 | 129 MB/s | +63.4 MB/s
60000000 | 135 MB/s | +87.8 MB/s
40000000 | 140 MB/s | +108.2 MB/s
Used dd to write in the VM:
dd if=/dev/zero of=/dev/vdb bs=1M count=8192 seek=24000
cstream | dd write
140000000 | 106 MB/s
120000000 | 123 MB/s
100000000 | 125 MB/s
80000000 | 126 MB/s
60000000 | 128 MB/s
40000000 | 123 MB/s
It seems that the backup process is greatly improved, many thanks!
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