Re: [PATCH 00/13] Pass data temperature information to zoned UFS devices

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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



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