Hi all, We've seen strange behaviour in bcache mode in current bcache-testing branch with Possible allocator fix:
Once I start writing data with "dd if=/dev/zero of=/dev/bcache0 bs=4k count=10000 oflag=sync", all SSDs in the Pool go close to 100% util and I see about 3600 writes/second in iostat for each disk in the pool, BUT no data written in means of throughput. Then after some seconds (the flush interval of bcache) I see the flush of the writeback and also data written to the pool SSDs which looks pretty much like reordering and merging happened for that data. bcache-3.2 does not have such problem. only bcache(master) and bcache-testing have such problem. What's the possible reason? Regards, Jack -- To unsubscribe from this list: send the line "unsubscribe linux-bcache" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
