Messages in this thread |  | | Subject | Re: [PATCH] block: BFQ default for single queue devices | From | Bart Van Assche <> | Date | Wed, 03 Oct 2018 08:54:51 -0700 |
| |
On Wed, 2018-10-03 at 08:29 +0200, Paolo Valente wrote: > [1] https://lkml.org/lkml/2017/2/21/791 > [2] http://algo.ing.unimo.it/people/paolo/disk_sched/results.php > [3] https://lwn.net/Articles/763603/
From [2]: "BFQ loses about 18% with only random readers, because the number of IOPS becomes so high that the execution time and parallel efficiency of the schedulers becomes relevant." Since the number of I/O patterns for which results are available on [2] is limited and since the number of devices for which test results are available on [2] is limited (e.g. RAID is missing), there might be other cases in which configuring BFQ as the default would introduce a regression.
I agree with Jens that it's best to leave it to the Linux distributors to select a default I/O scheduler.
Bart.
|  |