I'm trying to troubleshoot a newly setup nfs server, which, sometimes has a 30 second pause (tcpdump shows its server waiting).

# time touch /usr/portage/distfiles/testfile

real    0m30.088s
user    0m0.000s
sys     0m0.001s

I cant see anything in the nfs server debugging so i want to strace nfsd. First i tell it to use single thread so i know i;m stracing the correct thread, but;

# grep OPTS_RPC_NFSD nfs
#OPTS_RPC_NFSD="8 -N2 -V 3 -V 4 -V 4.1"
OPTS_RPC_NFSD="1 -N2 -V 3 -V 4 -V 4.1"
#  systemctl restart nfs-server
# pgrep -lf nfsd
23546 nfsd4_callbacks
23548 nfsd
23549 nfsd
23550 nfsd
23551 nfsd
23552 nfsd
23553 nfsd
23554 nfsd
23555 nfsd