On Fri, Jun 27, 2008 at 04:58:47PM +0300, Eero Tamminen wrote: > ext Marius Gedminas wrote: > >Still, that doesn't explain the other experiments I did earlier. I > >created a 1.7 GB partition (to be really really sure I'm not > >accidentally trying to make the filesystem larger than the device), > >formatted it as VFAT and created a single large empty file (dd > >if=/dev/zero of=/media/mmc2/bigfile), and that caused vfat errors in > >dmesg and, at least once, caused the *partition table* to get > >overwritten with zeroes. See this (short) thread: > >http://lists.maemo.org/pipermail/maemo-users/2008-March/020492.html > > What if you use the whole card like Windows usually formats them > i.e. whole card is a single partition without any partition table? > > Does that change anything? Let me try it now. First, disable virtual memory in the Control Panel. Then ssh to the tablet and become root # umount /dev/mmcblk0p1 Let me first see if the problem persists in Diablo # sfdisk -l /dev/mmcblk0 Disk /dev/mmcblk0: 61440 cylinders, 4 heads, 16 sectors/track Units = cylinders of 32768 bytes, blocks of 1024 bytes, counting from 0 Device Boot Start End #cyls #blocks Id System /dev/mmcblk0p1 0+ 61439 61440- 1966072 b W95 FAT32 /dev/mmcblk0p2 0 - 0 0 0 Empty /dev/mmcblk0p3 0 - 0 0 0 Empty /dev/mmcblk0p4 0 - 0 0 0 Empty # mkdosfs -F 32 /dev/mmcblk0p1 # mount /dev/mmcblk0p1 Aargh, it mounted the fs on /media/mmc1, on top of my external card # umount /dev/mmcblk0p1 # mount /dev/mmcblk0p1 /media/mmc2 # dd if=/dev/zero of=/media/mmc2/bigfile bs=4K long wait at 1.7 MB/s, while wondering what these tests do to the life time of my non-replaceable internal flash memory... dd: writing '/media/mmc2/bigfile': No space left on device 490555+0 records in 490554+0 records out # dmesg|tail No errors # grep mmcblk0p1 /proc/mounts /dev/mmcblk0p1 /media/mmc2 msdos rw,fmask=0022,dmask=0022,codepage=cp437 0 0 Not remounted read-only. Although I now see it's mounted as msdos rather than vfat. # umount /media/mmc2 # mount -t vfat /dev/mmcblk0p1 /media/mmc2 # cat /media/mmc2/bigfile > /dev/null 4.6 megs per second, according to vmstat. No errors in dmesg. Good! So, either it was a bug in Chinook's kernel, or I was doing something wrong in my tests. Marius Gedminas -- "Linux was made by foreign terrorists to take money from true US companies like Microsoft." -Some AOL'er. "To this end we dedicate ourselves..." -Don (From the sig of "Don" <don@xxxxxxxxxx>)
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