Messages in this thread | | | Date | Tue, 13 Dec 2005 19:38:22 +0100 | From | Jens Axboe <> | Subject | Re: [DOC PATCH] block/stat.txt |
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On Tue, Dec 13 2005, Andy Isaacson wrote: > > > +in_flight > > > +========= > > > + > > > +This value counts the number of currently-queued I/O requests. > > > > A little confusing - it's the number of in flight io at the > > driver/device end, that is after the block layer. One could read the > > above as total in flight (total queued in the queue for the device), > > which is a very different number. > > I wrote from misunderstanding, so it's no suprise what I wrote was > wrong. :) Is "number of requests in the queue" available somewhere?
Nope, it's only accounted internally I'm afraid. It's somewhere between 0 and ~ /sys/block/<dev>/queue/nr_requests (it can go a little higher than this value, hence approximately).
> How does this sound instead of the above? > > +in_flight > +========= > + > +This value counts the number of I/O requests that have been issued to > +the device driver but have not yet completed. It does not include I/O > +requests that are in the queue but not yet issued to the device driver.
That is perfect, thanks.
-- Jens Axboe
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