On Sun, Feb 24, 2013 at 11:12:22AM +1100, Dave Chinner wrote: > > >/dev/sda6 /home ext4 rw,noatime,discard 0 0 > ^^^^^^^ > I'd say that's your problem....
Looks like the Sandisk U100 is a good SSD for me to put on my personal "avoid" list: http://thessdreview.com/our-reviews/asus-zenbook-ssd-review-not-necessarily-sandforce-driven-shows-significant-speed-bump/ There are a number of SSD's which do not implement "trim" efficiently, so these days, the recommended way to use trim is to run the "fstrim" command out of crontab. There are some high performance flash devices (especially PCIe attached flash devices, where the TRIM command doesn't necessarily mean waiting for the entire contents of the Native Command Queue to drain) where using the discard mount option makes sense for best performance, but for most SATA drives (especially the really cheap-sh*t ones), I don't recommend it. If it weren't for the fact that for these devices exist and the discard option is especially useful for them, I probably would have removed the discard option from ext4. - Ted -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
