***** on the server:

#  grep -v \^# /etc/exports
/data      192.168.10.0/24(rw,async,subtree_check,root_squash) 127.0.0.1/8(rw,async,subtree_check,root_squash,insecure)

# showmount -e 
Export list for sheep:
/data 127.0.0.1/8,192.168.10.0/24

# ps aux | grep [n]fs
root      3242  0.0  0.0      0     0 ?        S<   14:00   0:00 [nfsd4]
root      3243  0.0  0.0      0     0 ?        D    14:00   0:00 [nfsd]
root      3244  0.0  0.0      0     0 ?        D    14:00   0:00 [nfsd]
root      3245  0.0  0.0      0     0 ?        D    14:00   0:00 [nfsd]
root      3246  0.0  0.0      0     0 ?        D    14:00   0:00 [nfsd]

# cat /proc/loadavg 
4.51, 4.18, 4.11 1/192 32130

# /etc/init.d/nfs-common start
Starting NFS common utilities: statd idmapd
# /etc/init.d/nfs-kernel-server start
Exporting directories for NFS kernel daemon....
Starting NFS kernel daemon: nfsd mountd.
# ps aux | grep [n]fs
root      3242  0.0  0.0      0     0 ?        S<   14:00   0:00 [nfsd4]
root      3243  0.0  0.0      0     0 ?        D    14:00   0:00 [nfsd]
root      3244  0.0  0.0      0     0 ?        D    14:00   0:00 [nfsd]
root      3245  0.0  0.0      0     0 ?        D    14:00   0:00 [nfsd]
root      3246  0.0  0.0      0     0 ?        D    14:00   0:00 [nfsd]
root     29590  0.0  0.0      0     0 ?        S    17:00   0:00 [nfsd]	*
root     29591  0.0  0.0      0     0 ?        S    17:00   0:00 [nfsd]	*
root     29592  0.2  0.0      0     0 ?        S    17:00   0:00 [nfsd]	*
root     29593  0.0  0.0      0     0 ?        S    17:00   0:00 [nfsd]	*

***** on the client:
# showmount -e sheep
Export list for sheep:
/data         127.0.0.1/8,192.168.10.0/24

# mount | grep nfs
sheep:/data on /data type nfs (rw,rsize=32768,wsize=32768,intr,proto=tcp,addr=192.168.10.10)

# ls -R /mnt/nfs/ 1>/dev/null
 ...got stuck, not responding to ^C

***** on the server again:
# ps aux | grep [n]fsd
root      3242  0.0  0.0      0     0 ?        S<   14:00   0:00 [nfsd4]
root      3243  0.0  0.0      0     0 ?        D    14:00   0:00 [nfsd]
root      3244  0.0  0.0      0     0 ?        D    14:00   0:00 [nfsd]
root      3245  0.0  0.0      0     0 ?        D    14:00   0:00 [nfsd]
root      3246  0.0  0.0      0     0 ?        D    14:00   0:00 [nfsd]
root     29590  0.0  0.0      0     0 ?        D    17:00   0:00 [nfsd]	*
root     29591  0.2  0.0      0     0 ?        D    17:00   0:00 [nfsd]	*
root     29592  0.0  0.0      0     0 ?        D    17:00   0:00 [nfsd]	*
root     29593  0.0  0.0      0     0 ?        D    17:00   0:00 [nfsd]	*

# cat /proc/loadavg 
8.11 6.78 5.30 1/194 32156

# /etc/init.d/nfs-kernel-server start
Exporting directories for NFS kernel daemon....
Starting NFS kernel daemon: nfsd mountd.
# dmesg | tail
Nov 11 17:39:08 sheep nfsd[4428]: nfssvc: Setting version failed: errno 16 (Device or resource busy)
Nov 11 17:39:16 sheep nfsd[4450]: nfssvc: Setting version failed: errno 16 (Device or resource busy)

# cat /proc/meminfo 
MemTotal:      2072880 kB
MemFree:         63108 kB
Buffers:         45920 kB
Cached:        1377576 kB
SwapCached:        244 kB
Active:        1168844 kB
Inactive:       739176 kB
HighTotal:     1179584 kB
HighFree:         7588 kB
LowTotal:       893296 kB
LowFree:         55520 kB
SwapTotal:     1542008 kB
SwapFree:      1541348 kB
Dirty:             284 kB
Writeback:           0 kB
AnonPages:      484396 kB
Mapped:          33532 kB
Slab:            76324 kB
SReclaimable:    66072 kB
SUnreclaim:      10252 kB
PageTables:       2320 kB
NFS_Unstable:        0 kB
Bounce:              0 kB
CommitLimit:   2578448 kB
Committed_AS:   946900 kB
VmallocTotal:   114680 kB
VmallocUsed:      9664 kB
VmallocChunk:   104240 kB



###############################################################################################
server: 2.6.24-rc1, nfs-user-server

# time ls -R /mnt/nfs 1>/dev/null 
real    0m1.383s
user    0m0.208s
sys     0m0.148s
# time ls -lR /mnt/nfs 1>/dev/null 
real    0m11.673s
user    0m0.652s
sys     0m1.136s

# find /mnt/nfs -type f | wc -l
14286

# find /mnt/nfs -type d | wc -l
 1569