Linux elevators (Re: BFQ: simple elevator)

2013-03-20 Thread Arlie Stephens
The ongoing thread reminds me of a simple question I've had since I first read about linux' mutiple I/O schedulers. Why is the choice of I/O scheduler global to the whole kernel, rather than per-device or similar? Consider a system with both traditional rotating disks and SSDs - not at all far

Re: Linux elevators (Re: BFQ: simple elevator)

2013-03-20 Thread Valdis . Kletnieks
On Wed, 20 Mar 2013 16:05:09 -0700, Arlie Stephens said: The ongoing thread reminds me of a simple question I've had since I first read about linux' mutiple I/O schedulers. Why is the choice of I/O scheduler global to the whole kernel, rather than per-device or similar? They aren't global to

Re: Linux elevators (Re: BFQ: simple elevator)

2013-03-20 Thread Arlie Stephens
On Mar 20 2013, valdis.kletni...@vt.edu wrote: On Wed, 20 Mar 2013 16:05:09 -0700, Arlie Stephens said: The ongoing thread reminds me of a simple question I've had since I first read about linux' mutiple I/O schedulers. Why is the choice of I/O scheduler global to the whole kernel, rather

Re: Linux elevators (Re: BFQ: simple elevator)

2013-03-20 Thread Raymond Jennings
On Wed, Mar 20, 2013 at 4:45 PM, Arlie Stephens ar...@worldash.org wrote: On Mar 20 2013, valdis.kletni...@vt.edu wrote: On Wed, 20 Mar 2013 16:05:09 -0700, Arlie Stephens said: The ongoing thread reminds me of a simple question I've had since I first read about linux' mutiple I/O