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strange nfs...
Hi,
I have a strange problem with xfs (kernel 2.4.7, cvs checkout from
about July, 20th) and nfs (kernel nfs server).
When the attached script is run against a nfs mounted xfs filesystem
the size of the directory trees checked with du is not constant:
# du -sk linux.*
142448 linux.orig
142448 linux.pass.0
142448 linux.pass.1
142448 linux.pass.2
142448 linux.pass.3
142448 linux.pass.4
142448 linux.pass.5
142448 linux.pass.6
142448 linux.pass.7
392036 linux.pass.8
701588 linux.pass.9
696992 linux.pass.10
695468 linux.pass.11
705772 linux.pass.12
703256 linux.pass.13
686964 linux.pass.14
709092 linux.pass.15
Comparing two directory trees shows:
# du -sk linux.orig/* linux.pass.15/*
20 linux.orig/COPYING
76 linux.orig/CREDITS
12 linux.orig/CVS
5728 linux.orig/Documentation
36 linux.orig/MAINTAINERS
20 linux.orig/Makefile
16 linux.orig/README
4 linux.orig/REPORTING-BUGS
12 linux.orig/Rules.make
26668 linux.orig/arch
67252 linux.orig/drivers
14036 linux.orig/fs
20180 linux.orig/include
36 linux.orig/init
100 linux.orig/ipc
212 linux.orig/kdb
404 linux.orig/kernel
120 linux.orig/lib
420 linux.orig/mm
6632 linux.orig/net
460 linux.orig/scripts
64 linux.pass.15/COPYING
128 linux.pass.15/CREDITS
192 linux.pass.15/CVS
34244 linux.pass.15/Documentation
64 linux.pass.15/MAINTAINERS
64 linux.pass.15/Makefile
64 linux.pass.15/README
64 linux.pass.15/REPORTING-BUGS
64 linux.pass.15/Rules.make
171172 linux.pass.15/arch
215548 linux.pass.15/drivers
57084 linux.pass.15/fs
187856 linux.pass.15/include
320 linux.pass.15/init
576 linux.pass.15/ipc
1156 linux.pass.15/kdb
1988 linux.pass.15/kernel
900 linux.pass.15/lib
1604 linux.pass.15/mm
32600 linux.pass.15/net
3336 linux.pass.15/scripts
But ls reports identical file sizes:
# ls -ld linux.orig/* linux.pass.15/*
drwxr-xr-x 18 2008 101 4096 Jul 10 17:16 linux.orig/arch
-rw-r--r-- 1 2008 101 18633 Jun 9 04:44
linux.orig/COPYING
-rw-r--r-- 1 2008 101 76191 Jul 5 08:13
linux.orig/CREDITS
drwxr-xr-x 2 2008 101 48 Jul 19 16:16 linux.orig/CVS
drwxr-xr-x 29 2008 101 4096 Jul 19 16:16
linux.orig/Documentation
drwxr-xr-x 39 2008 101 4096 Jul 19 16:16
linux.orig/drivers
drwxr-xr-x 44 2008 101 4096 Jul 19 16:16 linux.orig/fs
drwxr-xr-x 25 2008 101 4096 Jul 10 17:34
linux.orig/include
drwxr-xr-x 3 2008 101 45 Jul 10 17:34 linux.orig/init
drwxr-xr-x 3 2008 101 93 Jul 10 17:34 linux.orig/ipc
drwxr-xr-x 4 2008 101 4096 Jul 10 17:34 linux.orig/kdb
drwxr-xr-x 3 2008 101 4096 Jul 19 16:16
linux.orig/kernel
drwxr-xr-x 3 2008 101 4096 Jul 13 12:18 linux.orig/lib
-rw-r--r-- 1 2008 101 35274 Jul 19 16:16
linux.orig/MAINTAINERS
-rw-r--r-- 1 2008 101 17744 Jul 19 16:16
linux.orig/Makefile
drwxr-xr-x 3 2008 101 4096 Jul 19 16:16 linux.orig/mm
drwxr-xr-x 28 2008 101 4096 Jul 19 16:16 linux.orig/net
-rw-r--r-- 1 2008 101 14491 Apr 2 19:13
linux.orig/README
-rw-r--r-- 1 2008 101 2815 Mai 2 08:22
linux.orig/REPORTING-BUGS
-rw-r--r-- 1 2008 101 8884 Apr 2 19:13
linux.orig/Rules.make
drwxr-xr-x 6 2008 101 4096 Jul 10 17:35
linux.orig/scripts
drwxr-xr-x 18 2008 101 4096 Jul 10 17:16
linux.pass.15/arch
-rw-r--r-- 1 2008 101 18633 Jun 9 04:44
linux.pass.15/COPYING
-rw-r--r-- 1 2008 101 76191 Jul 5 08:13
linux.pass.15/CREDITS
drwxr-xr-x 2 2008 101 48 Jul 19 16:16
linux.pass.15/CVS
drwxr-xr-x 29 2008 101 4096 Jul 19 16:16
linux.pass.15/Documentation
drwxr-xr-x 39 2008 101 4096 Jul 19 16:16
linux.pass.15/drivers
drwxr-xr-x 44 2008 101 4096 Jul 19 16:16 linux.pass.15/fs
drwxr-xr-x 25 2008 101 4096 Jul 10 17:34
linux.pass.15/include
drwxr-xr-x 3 2008 101 45 Jul 10 17:34
linux.pass.15/init
drwxr-xr-x 3 2008 101 93 Jul 10 17:34
linux.pass.15/ipc
drwxr-xr-x 4 2008 101 4096 Jul 10 17:34
linux.pass.15/kdb
drwxr-xr-x 3 2008 101 4096 Jul 19 16:16
linux.pass.15/kernel
drwxr-xr-x 3 2008 101 4096 Jul 13 12:18
linux.pass.15/lib
-rw-r--r-- 1 2008 101 35274 Jul 19 16:16
linux.pass.15/MAINTAINERS
-rw-r--r-- 1 2008 101 17744 Jul 19 16:16
linux.pass.15/Makefile
drwxr-xr-x 3 2008 101 4096 Jul 19 16:16 linux.pass.15/mm
drwxr-xr-x 28 2008 101 4096 Jul 19 16:16
linux.pass.15/net
-rw-r--r-- 1 2008 101 14491 Apr 2 19:13
linux.pass.15/README
-rw-r--r-- 1 2008 101 2815 Mai 2 08:22
linux.pass.15/REPORTING-BUGS
-rw-r--r-- 1 2008 101 8884 Apr 2 19:13
linux.pass.15/Rules.make
drwxr-xr-x 6 2008 101 4096 Jul 10 17:35
linux.pass.15/scripts
And finally diff -r linux.orig linux.pass.15 does not find any
differences.
Both machines are PIII/800 with scsi disks and RedHat 7.1. The compiler
is
gcc version 2.96 20000731 (Red Hat Linux 7.1 2.96-81) which should to be
ok
(according to the comments in the makefile of the kernel tree).
If it was only du reporting wrong values it would not bother me, but
the reported space on the filesystem is really in use.
Klaus.
----------8<--------------------8<--------------------8<----------
#!/bin/sh
echo This is memtest.sh
# This is where we will run the tests at
TEST_DIR=/net/nfsserver/
# The location of the linux kernel source file we will be using
SOURCE_FILE=/tmp/linux-2.4.7-xfs.tar.gz
# How many passes to run of this test, higher numbers are better
NR_PASSES=200
# How many passes to run simultaneously (in order to flush memory on
# large memory machines).
#NR_SIMULTANEOUS=30
NR_SIMULTANEOUS=15
cd $TEST_DIR
echo TEST_DIR is $TEST_DIR
echo
# Remove any possible left over directories from a cancelled previous
run
echo `date`: rm -rf linux linux.orig linux.pass.*
rm -fr linux linux.orig linux.pass.*
# Unpack the one copy of the source tree that we will be comparing
against
echo `date`: unpacking linux.orig
zcat $SOURCE_FILE | tar xf -
mv linux linux.orig
i=0
while [ "$i" -lt "$NR_PASSES" ]; do
j=0
while [ "$j" -lt "$NR_SIMULTANEOUS" ]; do
echo `date`: unpacking linux.pass.$j
zcat $SOURCE_FILE | tar xf -
mv linux linux.pass.$j
j=`expr $j + 1`
done
j=0
while [ "$j" -lt "$NR_SIMULTANEOUS" ]; do
echo `date`: diff -r linux.orig linux.pass.$j
diff -r linux.orig linux.pass.$j | grep -v "Common subdirectories"
echo `date`: rm -rf linux.pass.$j
rm -fr linux.pass.$j
j=`expr $j + 1`
done
echo `date`: pass $i of $NR_PASSES finished
i=`expr $i + 1`
done
# Clean up after ourselves
echo `date`: cleaning up
rm -fr linux linux.orig linux.pass.*
echo `date`: done