Filling RAM
DMcLeod
dmcleod at bittware.com
Tue Feb 5 12:33:19 EST 2008
Hi,
I am seeing that as files are created, their approximate size is
subtracted from the available memory. For example, assume I have /home
mounted from /dev/mtdblock2, which is a jffs2 filesystem on NOR flash.
The following procedure reproduces the problem consistently:
[code]
]# cat /proc/mounts
rootfs / rootfs rw 0 0
/proc /proc proc rw 0 0
sysfs /sys sysfs rw 0 0
/dev/mtdblock2 /home jffs2 rw,sync 0 0
]# cd /home
]# grep MemFree /proc/meminfo
22588 kB
]# dd if=/dev/zero of=1M.dat bs=1M count=1
...
]# grep MemFree /proc/meminfo
21522 kB
]# rm 1M.dat
]# grep MemFree /proc/meminfo
22576 kB
[/code]
I'm fairly certain the file does get written to flash as it is
noticeably slower than creating a file of the same size in ramfs. So it
seems like the file is stored in RAM as well, how/why would this happen?
ps - XATTRS is off, JFFS2_SUMMARY is off, JFFS2_VERBOSITY = 0,
Any help is greatly appreciated.
More information about the linux-mtd
mailing list