Date: Wed, 20 Feb 2002 10:53:58 -0800 (PST) From: Eric Anderson <anderson@centtech.com> To: freebsd-gnats-submit@FreeBSD.org Subject: misc/35151: High NFSD load in FreeBSD 4.5R Message-ID: <200202201853.g1KIrwl19976@freefall.freebsd.org>
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>Number: 35151
>Category: misc
>Synopsis: High NFSD load in FreeBSD 4.5R
>Confidential: no
>Severity: critical
>Priority: high
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Wed Feb 20 11:00:01 PST 2002
>Closed-Date:
>Last-Modified:
>Originator: Eric Anderson
>Release: FreeBSD 4.5R (from ISO)
>Organization:
Centaur Technology
>Environment:
FreeBSD tesla.centtech.com 4.5-RELEASE FreeBSD 4.5-RELEASE #0: Mon Feb 18 09:54:43 CST 2002 root@tesla.centtech.com:/usr/obj/usr/src/sys/TESLA i386
>Description:
I have a FreeBSD 4.5R NFS server, and the nfsd is slamming the cpu, for no
apparent reason. I have Linux (RedHat 6.2, 7.2) and Solaris (2.7, 2.6) clients
accessing it via NFS. It is part of an NIS domain. I have had no problems in
the past, and had FreeBSD 4.4R on this machine and had NO TROUBLES until I
reinstalled and put 4.5R on it. I can not get the load down at all, and even
some clients timeout while talking to this server. Here is a clipped portion
from a top:
----------------
last pid: 328; load averages: 1.00, 1.02, 1.00 up 18+23:27:18 09:07:20
53 processes: 3 running, 50 sleeping
CPU states: 18.3% user, 0.0% nice, 80.5% system, 1.2% interrupt, 0.0% idle
Mem: 21M Active, 747M Inact, 182M Wired, 52M Cache, 112M Buf, 1664K Free
Swap: 2048M Total, 164K Used, 2048M Free
PID USERNAME PRI NICE SIZE RES STATE TIME WCPU CPU COMMAND
30358 root 61 0 364K 160K RUN 165.4H 94.43% 94.43% nfsd
30359 root 2 0 356K 152K RUN 32:39 2.93% 2.93% nfsd
30360 root 2 0 356K 152K nfsd 0:49 0.00% 0.00% nfsd
129 root 2 0 2512K 1524K select 0:38 0.00% 0.00% sendmail
80 root 2 0 1300K 748K select 0:35 0.00% 0.00% ntpd
23865 root 2 0 1868K 1032K select 0:21 0.00% 0.00% nmbd
87 root 2 0 720K 508K select 0:14 0.00% 0.00% mountd
30361 root 2 0 356K 152K nfsd 0:12 0.00% 0.00% nfsd
82 daemon 2 0 960K 560K select 0:11 0.00% 0.00% portmap
30362 root 2 0 356K 152K nfsd 0:07 0.00% 0.00% nfsd
115 root 2 0 1160K 756K select 0:07 0.00% 0.00% amd
-----------------
Here is some other info about the box:
machine has dual nics, and is serving data on both ports.
in rc.conf:
nfs_reserved_port_only="YES"
nfs_server_enable="YES"
nfs_server_flags="-h 10.177.178.51 -h 10.177.176.40 -u -t -n 20"
and in sysctl.conf:
vfs.nfs.gatherdelay=0
vfs.nfs.async=1
vfs.vmiodirenable=1
kern.ipc.maxsockbuf=2097152
kern.ipc.somaxconn=8192
kern.ipc.maxsockets=16424
kern.maxfiles=65536
kern.maxfilesperproc=32768
net.inet.tcp.rfc1323=1
net.inet.tcp.delayed_ack=0
net.inet.tcp.sendspace=65535
net.inet.tcp.recvspace=65535
net.inet.udp.recvspace=65535
net.inet.udp.maxdgram=57344
net.local.stream.recvspace=65535
net.local.stream.sendspace=65535
net.inet.ip.forwarding=1
>How-To-Repeat:
Build an NFS server using FreeBSD 4.5R. The machine should have 2 nics, and exporting filesystems to be nfs mounted (automounted) via linux/freebsd/solaris boxes. The nfsd load immediately jumps up.
>Fix:
None!
>Release-Note:
>Audit-Trail:
>Unformatted:
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