Am 29.05.2012 23:41, schrieb Mark Nelson: > When you are using 1 thread, you are hitting a ~40MB/s limit (probably > networking related) before the data gets to the journal. 1GB/s is capable of at least 130Mb/s and i get 130MB/s with 3.0.30 using 16 threads. I don't get why i should hit a limit here. > Because (in > this case) the filestore data disk can handle that throughput, > everything looks nice and consistent. osd bench and fio and dd tells me the underlying disks can handle 260MB/s (Intel SSD). > In this case, that 40MB/s limit with 1 thread has increased. Now more > data is getting fed into the journal than the filestore can write out to > disk. Eventually writes stall while the data is being written out. I don't want to argue but why should this only happen with 3.4.0 and NOT with 3.0.30. Even though it does not matter which underlying FS i use. It is the same with XFS AND btrfs. Stefan -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
