I think you are talking about tagged command queuing.
Regards,
Ameet
Raghu R. Arur wrote:
Hi,
I had a question regarding SCSI disk driver.
Does SCSI disk reorder the requests it gets from the OS. I always
believed that the OS orders the requests based on some algorithm (say
elevator, SSTF etc.) and the disk just picks the request from the head of
the queue and services them in FIFO order. But when I traced the sector
number of the request that are sent to the device and the sectors that get
serviced dont seem to be in this FIFO order. it more likely seems to be in
a elevator fashion. So does the SCSI driver has some intelligence that
reorders the requests to increase throughput.
thanks a lot,
Raghu.
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