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extremely slow disk write when mounted with sync option

Hongfeng Wang
Genius 3925 points

a simple dd test
dd if=/dev/zero bs=2048 count=10000 of=test.dat

with sync enabled yields 153 kB/s, while it was 21.5MB/s with sync disabled.

This is DM8148 based system running kernel 2.6.37. file system is ext4. data=journal,barrier=1
Many times the users will just pull the plug of system, sometimes the filesystem get corrupted, that's why I am using the sync option. The SSD is connected through SATA interface.

Is there any other way to minimize disk corruption and not reduce the speed to such a ridiculously slow level?

thanks!