On Wed, Aug 21, 2013 at 10:48:57AM +0200, Georg Schönberger wrote: > Hi bcache team, > > we are currently developing performance test scripts with Fio for bcache. > At the end of a test we want to detach and destroy the cache. Therefore we did: > echo 1 > /sys/block/$dev/bcache/detach > echo 1 > /sys/block/$dev/bcache/stop > > echo 1 > /sys/fs/bcache/*/stop > echo 1 > /sys/fs/bcache/*/unregister > > With a simple randwrite test with we had about 2GB dirty data in the cache. After detaching the dirty data flush rate was about 900KB/s from SSD to HDD. > Is there a way to accelerate flushing of dirty data? > What is the correct way to detach/destroy a writeback caching device? The stop is unnecessary for the cache set (that'll shut down the cache set without detaching anything or flushing dirty data). 900KB/sec sounds like a bug though - I'll try and take a look at it tomorrow. -- 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
