[Jfs-discussion] Tests with kernel v2.4.13, ext2, ext3, xfs, and jfs

[Michael <mue...@ni...>]

Hello!

Some days ago I bought a 60GB harddisk. I used this empty disk to
compare some filesystems with JFS. I was able to patch the 2.4.13
kernel with ext3 + xfs + jfs (v1.0.8) (I carried out only some small
manual changes).

I made the tests on a 700MHz Athlon with 384MB RAM. Both HDs use UDMA
Mode 4 (66MHz).

Here are my results:

The old HD:
grizzly:/opt/Tonne# hdparm -t -T /dev/hda

/dev/hda:
 Timing buffer-cache reads:   128 MB in  0.68 seconds =188.24 MB/sec
 Timing buffered disk reads:  64 MB in  1.84 seconds = 34.78 MB/sec

The new HD:
grizzly:/opt/Tonne# hdparm -t -T /dev/hdb

/dev/hdb:
 Timing buffer-cache reads:   128 MB in  0.66 seconds =193.94 MB/sec
 Timing buffered disk reads:  64 MB in  1.64 seconds = 39.02 MB/sec

'df' after filesystem creation:
	 Dateisystem          1k-Blöcke    Benutzt Verfügbar
ext2 /dev/hdb1             59107604        20  56105008
ext3 /dev/hdb1             59107604     32828  56072200
jfs	 /dev/hdb1             60016764      7464  60009300
xfs	 /dev/hdb1             60044240       944  60043296

jfs and xfs have more space available!

bonnie:
              -------Sequential Output-------- ---Sequential Input-- --Random--
              -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
Machine    MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU  /sec %CPU
ext2     2000  6512 99.2 32978 16.8 12228  8.5  5632 89.3 39190 17.6 129.6  0.6
ext2     2000  6489 99.2 32338 16.5 11800  8.7  5625 89.2 39446 18.0 125.7  0.8

ext3     2000  6108 97.5 21067 25.0 15559 13.8  5550 89.1 39265 21.4 118.3  0.8
ext3     2000  6214 98.7 24288 26.0 16691 14.9  5580 89.5 39283 21.2 118.2  0.8

jfs      2000  5371 82.3 29412 18.9 16749 11.1  5696 90.4 39315 17.9 132.7  0.8
jfs      2000  5351 81.8 28253 17.8 17254 11.3  5730 90.8 39460 17.4 132.5  0.6

xfs      2000  5453 83.4 28412 15.2 12652 10.6  5733 91.5 39594 20.9 143.0  0.9
xfs      2000  5423 83.1 28005 15.7 11932  9.2  5697 90.9 39811 19.9 146.1  0.8

Copying two big files (each 700MB) from hda to hdb:
ext2	1m41s
ext3	1m50s
jfs		1m58s
xfs		1m40s

Copying a big directory with small files (some kernel trees):
Depending on the filesystem the amount varies!
		  amount copying	'du -sh'   rm -r
ext2	  986M	 7m3s		39s		   1m
ext3	  986M	 7m21s		1m1s	   1m3s
jfs		  983M	 8m1s		20s		   2m50s
xfs		  976M	 8m22s		52s		   2m25s

One remark to the manpage of mkfs.jfs.
-ls:log_size
   Set the log size (in megabytes).  If the -ls option is not used, the default is 4% of
   the aggregate size.
(The value in the manpage to mkfs.jfs v1.0.6 was 0.4%.)
4% from 60GB would be 2.4 GB. But:
from mkfs.jfs:
60051568 kilobytes total disk space.
and
60016764 kb from 'df'
=> 34MB for the journaling file. So the explanation is not correct.

Best regards!

Michael