Pasted

root@debian64:~# mount |grep /mnt/host
home on /mnt/host type 9p (rw,noatime,access=client,trans=virtio)
root@debian64:~# time tar c /mnt/host/src/kernel/teknoraver/net/ |cat >/dev/null
tar: Removing leading `/' from member names
 real    0m13.060s
user    0m0.043s
sys     0m1.607s
  root@debian64:~# mount |grep /mnt/host
hostfs on /mnt/host type virtiofs (rw,relatime)
root@debian64:~# time tar c /mnt/host/kernel/teknoraver/net/ |cat >/dev/null
tar: Removing leading `/' from member names
 real    0m1.785s
user    0m0.080s
sys     0m1.308s