Hi, On 02/03/2012 06:59 AM, Mulyadi Santosa wrote: > > I could only offer this explanation: > blktrace traces events in block level. In this level, I/O is likely > serialized....unless you have more than one physical disks. > > in ftrace, you see events right before it hits block level operation. > Somewhere between VFS, filesystem operation and I/O scheduling which > deals with queue reordering. In this case, parallel operation is > likely to happen because more than processes could submit read or > write. If I understand the patch which introduces the blk tracer to ftrace (http://lwn.net/Articles/315508/) just uses the blktrace interface. So I wonder why using this influences the I/O behaviour. Best regards, Matthias _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
