Bart, > Do you plan to use existing bits from the ioprio bitmask or new bits? > Bits 0-2 are used for the priority level. Bits 3-5 are used for CDL. > Bits 13-15 are used for the I/O priority. The SCSI and NVMe standard > define 64 different data lifetimes (six bits). So there are 16 - 3 - 3 > - 6 = 4 remaining bits. I just use the existing I/O priority classes and levels to set a high/normal/low relative priority. I would still like pursue I/O classification since that performed better in our testing. But that does involve working with vendors on a Linux profile as discussed at LSF/MM. Don't really more than a handful in either case. -- Martin K. Petersen Oracle Linux Engineering
