High CPU usage on ZFS

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Renowned Member
Mar 14, 2012
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Hi,

I did a few benchmarks on latest PM 6 with ZFS.
I wonder why does a simple dd write inside KVM VM or on host eat 20% of E5-2690v2 CPU?

highCPUsimpleDD.png

Code: 
        NAME                                                     STATE     READ WRITE CKSUM
        rpool                                                    ONLINE       0     0     0
          mirror-0                                               ONLINE       0     0     0
            ata-SAMSUNG_MZ7LM960HCHP-000MV_S2LBNXAH324668-part3  ONLINE       0     0     0
            ata-SAMSUNG_MZ7LM960HCHP-000MV_S2LBNXAH324365-part3  ONLINE       0     0     0
          mirror-1                                               ONLINE       0     0     0
            ata-SAMSUNG_MZ7LM960HCHP-000MV_S2LBNXAH324419        ONLINE       0     0     0
            ata-SAMSUNG_MZ7LM960HCHP-000MV_S2LBNXAH324096        ONLINE       0     0     0
          mirror-2                                               ONLINE       0     0     0
            ata-SAMSUNG_MZ7LM960HCHP-000MV_S2LBNXAH324415        ONLINE       0     0     0
            ata-SAMSUNG_MZ7LM960HCHP-000MV_S2LBNXAH324414        ONLINE       0     0     0
        logs
          nvme-INTEL_SSDPE21K100GA_PHKE831500DJ100EGN-part1      ONLINE       0     0     0

What options (besides the removing compression) do we have to reduce CPU usage?
 
Hi guys.

all your suggestions are nice.
However live migration with LVM takes forever, because it synces whole VM, but if using ZFS with replication it takes just a few seconds.

However I solved this by installing intel microcode and now host uses much less CPU, or works as expected. :)
F****g intel and their security flaws.
 
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