2008-06-30 09:08:12

by Krishna Kumar2

[permalink] [raw]
Subject: Re: [NFS] NFS performance debugging

[email protected] wrote on 06/27/2008 07:14:38 PM:

> At a guess, it's because the client is now caching your file data?

Today it is working fine, so maybe something was wrong earlier. However,
nfs-iostat shows very low BW:

op/s rpc bklog
42.60 0.00
read: ops/s Kb/s Kb/op retrans
avg RTT (ms) avg exe (ms)
42.542 2734.324 64.273 0 (0.0%)
18.480 18.518
write: ops/s Kb/s Kb/op retrans
avg RTT (ms) avg exe (ms)
0.000 0.000 0.000 0 (0.0%)
0.000 0.000

A cat of the file (after fresh mount of /local and /nfs) on the NFS
mountpoint to
/dev/null gives around 29.4 MB/s (vs 39.1 MB/s on /local).

> Can you post a copy of your mount command line, and your
> /proc/self/mountstats file after a test run (but before you unmount)?

mount:
mount -o
rw,bg,hard,nointr,proto=tcp,vers=3,rsize=65536,wsize=65536,timeo=600,noatime
localhost:/local /nfs

mountstats file:

device rootfs mounted on / with fstype rootfs
device /dev/root mounted on / with fstype ext3
device /dev mounted on /dev with fstype tmpfs
device /proc mounted on /proc with fstype proc
device /sys mounted on /sys with fstype sysfs
device none mounted on /selinux with fstype selinuxfs
device /proc/bus/usb mounted on /proc/bus/usb with fstype usbfs
device devpts mounted on /dev/pts with fstype devpts
device tmpfs mounted on /dev/shm with fstype tmpfs
device none mounted on /proc/sys/fs/binfmt_misc with fstype binfmt_misc
device sunrpc mounted on /var/lib/nfs/rpc_pipefs with fstype rpc_pipefs
device /etc/auto.misc mounted on /misc with fstype autofs
device -hosts mounted on /net with fstype autofs
device nfsd mounted on /proc/fs/nfsd with fstype nfsd
device /dev/sda6 mounted on /local with fstype ext3
device localhost:/local mounted on /nfs with fstype nfs statvers=1.0
opts:
rw,vers=3,rsize=65536,wsize=65536,acregmin=3,acregmax=60,acdirmin=30,acdirmax=60,hard,proto=tcp,timeo=600,retrans=2,sec=sys
age: 79
caps: caps=0x9,wtmult=4096,dtsize=4096,bsize=0,namelen=255
sec: flavor=1,pseudoflavor=1
events: 0 0 0 0 1 3 4 0 0 609 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0
bytes: 595722240 0 0 0 596639744 0 145664 0
RPC iostats version: 1.0 p/v: 100003/3 (nfs)
xprt: tcp 855 0 2 0 60 9117 9117 0 72672 0
per-op statistics
NULL: 0 0 0 0 0 0 0 0
GETATTR: 2 2 0 264 224 0 0 0
SETATTR: 0 0 0 0 0 0 0 0
LOOKUP: 3 3 0 448 684 0 1 1
ACCESS: 4 4 0 568 480 0 0 0
READLINK: 0 0 0 0 0 0 0 0
READ: 9104 9104 0 1383808 597805056 15 168246 168587
WRITE: 0 0 0 0 0 0 0 0
CREATE: 0 0 0 0 0 0 0 0
MKDIR: 0 0 0 0 0 0 0 0
SYMLINK: 0 0 0 0 0 0 0 0
MKNOD: 0 0 0 0 0 0 0 0
REMOVE: 0 0 0 0 0 0 0 0
RMDIR: 0 0 0 0 0 0 0 0
RENAME: 0 0 0 0 0 0 0 0
LINK: 0 0 0 0 0 0 0 0
READDIR: 0 0 0 0 0 0 0 0
READDIRPLUS: 0 0 0 0 0 0 0 0
FSSTAT: 0 0 0 0 0 0 0 0
FSINFO: 1 1 0 132 80 0 0 0
PATHCONF: 0 0 0 0 0 0 0 0
COMMIT: 0 0 0 0 0 0 0 0

And:

[[email protected] nfs]# nfsstat -rc
Client rpc stats:
calls retrans authrefrsh
713710 19 0

Thanks,

- KK


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