Comment 2 for bug 1750829

Quoting one quick and simple user benchmark with and without "pcid" feature
flag from 'qemu-devel' mailing list post[1]:

[quote]

    the performance difference is significant:

    no pcid:
    # time for i in $(seq 1 1 50); do du -sx /; done
    ...
    real 0m26.614s
    user 0m17.548s
    sys 0m9.056s

    kvm started with +pcid:
    # time for i in $(seq 1 1 50); do du -sx /; done
    ...
    real 0m14.734s
    user 0m7.755s
    sys 0m6.973s

[/quote]

[1] https://lists.nongnu.org/archive/html/qemu-devel/2018-01/msg01508.html