On Sun, Nov 06, 2016 at 03:04:12PM +0100, Marcin wrote: > Hi! > I'm trying mentioned branch. I've got tiered bcachefs witch lz4 compresion > turned on. > After some times of copying of files into bcachefs I noticed huge slow downa > of writing. Htop shows that kernel thread bcache_gc consumes a lot of CPU > and spends a lot of time waiting for I/O. Iostat shows that almost all > I/Ooperations goes to tier 1. In dmesg I see a couple of repeated messages > (they appears together, "INFO: task kworker/u8:2:11787 blocked for more than > 120 seconds." with "INFO: task rsync:11935 blocked for more than 120 > seconds." : Sounds like tiering isn't freeing up space on tier 0... Can you check cache0/alloc_debug (assuming cache0 is your tier 0 device) to confirm? After that, could you hammer on single device mode for awhile? I need to know if I'm just looking for tiering bugs, or if the btree changes have issues. -- To unsubscribe from this list: send the line "unsubscribe linux-bcache" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
