On Wed, 2011-08-17 at 13:11 +0200, Arnd Bergmann wrote:
On Wednesday 17 August 2011, James Tunnicliffe wrote:
One thing I noticed during Ubuntu boot on my Panda was that the mount process would say that it detected btrfs was running on a flash card and it had enabled flash mode. I don't know what is different in flash mode and I don't know if when I let Ubuntu auto-mount a flash card for testing on my Laptop if it enabled it. The only mount option I can find that sounds right is "ssd", which isn't on when I just tested it now.
Good point. Tixy, do you know what mode you were testing btrfs with?
No idea. Do you know a way of finding out what default mount options are? The only documentation I've found is the man page for 'mount', but this doesn't mention btrfs at all.
btrfs understands the 'ssd', 'ssd_spread' and 'nossd' mount options that should have a significant impact here, although it's not clear which of these is best for a flash memory card, since the characteristics of SD cards are very different from SSD.
I'll try those combinations too.