On Wed, Dec 10, 2014 at 08:00:13PM +0900, Akira Hayakawa wrote: > Hi, Joe > > Thanks for continuous evaluation. Some more details: dd, with block size 512b ------------------------ raw spindle : 143 writeboost Type 0: 137 writeboost Type 1: 130 dd, with block size 4k ---------------------- raw spindle : 31 writeboost Type 0: 29 writeboost Type 1: 81 dd, with block size 64m ----------------------- raw spindle : 8.9 writeboost Type 0: 32 writeboost Type 1: 72 So maybe it's just volume of IO that's causing the problem? What's the difference between Type 0 and Type 1? In the code I notice you have 'rambuf' structures, are you caching IO in memory? -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
