NFS on Raspberry Pi high load

[basti <black.fledermaus@arcor.de>]

Hello,
perhaps thats a bit OT but I can't found a Rasbian or RaspberryPi
related mailinglist.

Per default nfs starts with 8 servers

root@raspberrypi:~# head -n 2 /etc/default/nfs-kernel-server
# Number of servers to start up
RPCNFSDCOUNT=8

So I try to transfer a 3GB file from the raspberry to my laptop via WLAN(n).
This operation kills my raspberry.
I get a load of 12 and more. 10 Minutes after I interrupt this operation
the load was still at 10.
So I deside to reduce the number of servers to 2. Now it's a bit better,
the load is only around 5.

iotop show me a read speed around 3 MB/s, there is a Class 10 UHS card
(10-15 MB/s read, 9-5 MB/s write I guess).

Test on "Pi 1 model B" with 512MB RAM.

Can somebody reproduce this behavior?

Thanks a lot.
Regards Basti