From imp@bsdimp.com Sat Jan 9 16:17:53 2016 Date: Sat, 9 Jan 2016 16:17:47 -0500 From: Warner Losh To: monthly@freebsd.org Subject: I/O Scheduler report CAM I/O Scheduler Warner Losh imp@freebsd.org BSDCan Paper Phabricator review

Reviews have begun on the CAM I/O scheduler that I wrote for Netflix. It's anticipated that this process will be done in time for the FreeBSD 11 branch.

Details about this work can be found in the included BSDcan paper from last year.

Briefly, the scheduler allows one to differentiate I/O types and limit I/O based on the type and characteristics of the I/Os (including the latency of recent requests relative to historical averages). This is most useful when tuning system loads to SSD performance. Both a simple default scheduler, the same that we use today in FreeBSD, as well as a scheduler that can be well tuned for system loads related to video streaming will be included.

Netflix, Inc