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UM0851 Datasheet(PDF) 149 Page - STMicroelectronics

Part # UM0851
Description  SPEAr is a family of highly customizable ARM-based embedded
PDF  245 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UM0851 Datasheet(HTML) 149 Page - STMicroelectronics

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UM0851
Non-volatile memory device drivers
Doc ID 16604 Rev 2
149/245
5.3.6
Serial NOR device driver performance
●
Hardware: ARM926EJS (333 MHz), STMicroelectronics 8 MB M25P64 Serial NOR
Flash.
●
Test Filesystem on the NAND Flash: JFFS2 (for /dev/mtdblock3)
●
Kernel: Linux-2.6.27
Results for JFFS2
Compression is on by default in JFFS2. This causes the writing of data, which is uniform, to
finish in much less time. Therefore compression was disabled from config.
Mount JFFS2 fs and write/read to a file. Sequence is as follows:
1.
mount –t jffs2 /dev/mtdblock3 /mnt
2.
time dd if=/dev/zero of=/mnt/file.bin bs=128K count=8 (Write the file)
3.
umount /mnt
4.
mount –t jffs2 /dev/mtdblock3 /mnt
5.
time dd if=/mnt/file.bin of=/dev/null bs=128K count=8 (Read file back)
6.
umount /mnt
7.
mount –t jffs2 /dev/mtdblock3 /mnt
8.
rm /mnt/file.bin
9.
umount /mnt
10. Repeat for bs = 128K, 256K, 512K, 1024K and count=8, 4,2, 1.
Note:
Please be sure that JFFS2 compression is disabled. To disable it, use the following Linux
configuration parameter: CONFIG_JFFS2_CMODE_NONE.
Table 41.
Results on SPEAr600
#
Block size in
Kbytes
File size
in MB
Duration
(seconds)
in write
Mega
byte/sec in
write
Duration
(seconds) in
read
Mega byte/sec
in read
1
4
1
2.28
0.438596491
0.12
8.333333333
2
8
1
2.85
0.350877193
0.12
8.333333333
3
16
1
2.27
0.440528634
0.12
8.333333333
4
32
1
2.27
0.440528634
0.12
8.333333333
5
64
1
2.27
0.440528634
0.12
8.333333333



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