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ext3 2.4.21 htree tests



Hi,

Just thought I'd share some test results of mine in case anyone is interested.

Basically the tests are siumulating what our product does with files - although the tests do it a lot quicker (not as many files though).

The test is to create 1 million files (each containing the text of the file number) spread over a number of directories. The files are then removed in the same manner as they are created. I added tests later to overwrite the existing files to see if there is any additional performance hit.

All results in seconds, in kernel order 2.4.20 (pre11), 2.4.21, 2.4.21 + dir_index

Files spread over 100 directories:

Create : 1764, N/A, 1078
Remove : 611, N/A, 1310

Ok so results are not that great - better to use more directories.

Files spread over 1000 directories:

Create: 409, 305, 284
Remove: 138, 96, 141

Create: 377, 312, 276
Overwrite: 317, 246, 268
Overwrite2: 321, 241, 265

I was interested in seeing if the htree patches would give me a performance increase - although I guess the sequential nature of the file creation/deletion probably will not benefit - although I was suprised that adding dir_index hit the overwrite and removal speed - probably based on this testing I won't use this feature (yet).

Cpu info:

processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 6
model           : 3
model name      : AMD Duron(tm) Processor
stepping        : 1
cpu MHz         : 1016.400
cache size      : 64 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 1
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 mmx fxsr syscall mmxext 3dnowext 3dnow
bogomips        : 2025.06

hdparm -i /dev/hda

/dev/hda:

 Model=Maxtor 6Y080L0, FwRev=YAR41BW0, SerialNo=Y2M0FH0E
 Config={ Fixed }
 RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=57
 BuffType=3(DualPortCache), BuffSize=2048kB, MaxMultSect=16, MultSect=16
 DblWordIO=no, OldPIO=2, DMA=yes, OldDMA=0
 CurCHS=4047/16/255, CurSects=-217054981, LBA=yes, LBAsects=160086528
 tDMA={min:120,rec:120}, DMA modes: mword0 mword1 mword2
 IORDY=on/off, tPIO={min:120,w/IORDY:120}, PIO modes: mode3 mode4
 UDMA modes: mode0 mode1 mode2 mode3 mode4 *mode5 mode6

[ct_sys installed TEST]# hdparm /dev/hda

/dev/hda:
 multcount    = 16 (on)
 I/O support  =  0 (default 16-bit)
 unmaskirq    =  0 (off)
 using_dma    =  1 (on)
 keepsettings =  0 (off)
 nowerr       =  0 (off)
 readonly     =  0 (off)
 readahead    =  8 (on)
 geometry     = 9964/255/63, sectors = 160086528, start = 0

Kernel 2.4.20 & 21 both output same disk settings.

Glen


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