Jens Axboe wrote:
While that may make some sense internally, the exported interface would
never be workable like that. It needs to be simple, "give me foo kb/sec
with max latency bar for this file", with an access pattern or assumed
sequential io.
Nobody speaks of iops/sec except some silly benchmark programs. I know
that you are describing pseudo-iops, but it still doesn't make it more
clear.
Things aren't as simple
How about "give me 10% of total io capacity?" People understand
this, and the io scheduler can then guarantee this by ensuring
that the process gets 1 out of 10 io requests as long as it
keeps submitting enough.
The admin can then set a reasonable percentage depending on
the machine's capacity.
Helge Hafting
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