Problem solved. The solution is here:
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Make sure you have connected with 1GB/s speed:
# ethtool eth0 | grep "Speed" Speed: 1000Mb/s
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Edit settings of your NFS server:
# vi /etc/exports /nfs *(rw,all_squash,sync,no_subtree_check,insecure,anonuid=500,anongid=1000)
Change the “sync” option to “async” to improve perfomance, than press: Esc, :, w, q, Enter. Restart your NFS server:
# /etc/init.d/nfs-kernel-server reload
(Discussion was here)
WARNING! ‘Async’ option brings some risk if when NFS-server craches. But I didn’t find how to speed up NFS on MBL other way. So if your power supply is not stable DO NOT USE ‘async’ mode.
3 .Disble some usefull services (optionally).
# /etc/init.d/netatalk stop
# /etc/init.d/upnp_nas stop
# /etc/init.d/mDNSResponder stop
# /etc/init.d/orion stop
NFS needs portmap. Don’t stop it!
(Discussion was here: here)
Hope it helps others.