Martin Steigerwald wrote:
Hi!
I am searching documentation about CFQ io scheduler. I can't find it in linux
2.6.26 Documentation directory.
I found about these in german[1]:
back_seek_max:16384
back_seek_penalty:2
fifo_expire_async:250
fifo_expire_sync:123
quantum:4
But I am completely missing about these:
slice_async:40
Base length of an asynchronous queue timeslice (that is, how long the
queue has to dispatch requests each round). The actual timeslice
length is scaled by the I/O priority.
slice_async_rq:2
The base number of requests per round for asynchronous queues. Like
slice_async, the actual maximum is a function of slice_async_rq and I/O
priority.
slice_idle:6
How long to wait for processes to produce more I/O before switching
queues. This is for anticipation of sequential I/O, and more even disk
time distribution for processes doing back to back synchronous I/Os.
slice_sync:100
Same as slice_async, but for synchronous requests.
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