On Wed, Jun 20, 2018 at 07:37:20PM +0200, Miroslav Lachman wrote: > > %busy comes from the devstat layer. It's defined as the percent of the > > time over the polling interval in which at least one transaction was > > awaiting completion by the lower layers. It's an imperfect measure of > > how busy the drives are (in ye-olden days, before tagged queuing and > > NCQ, it was OK because you had THE transaction pending and it was a good > > measure of how utilized things were. Now with concurrent I/O in flash > > devices, it's only an imperfect approximation). > > Yes, I am aware of this issue. This percentage is just "is it slightly > loaded or heavily loaded" indicator.
for "heavily loaded" use average transaction time and average queue length _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "[email protected]"
