Re: Plan: journalling fixes for WAPBL

[David Holland <dholland-tech%netbsd.org@localhost>]

On Mon, Jan 02, 2017 at 01:01:34PM -0500, Thor Lancelot Simon wrote:
 > On Mon, Jan 02, 2017 at 05:31:23PM +0000, David Holland wrote:
 > > (from a while back)
 > > 
 > > However, I'm missing something. The I/O queue depths that you need to
 > > get peak write performance from SSDs are larger than 31, and the test
 > > labs appear to have been able to do this with SATA-attached SSDs...
 > > what are/were they doing?
 > 
 > Aggressive prefetching, extreme efforts to reduce command latency at
 > the drive end of the SATA link (and higher link speeds), plus much
 > larger request sizes than we can issue.

Yes, but I mean testing with queue depths > 31, like ~100, which I'm
sure I remember seeing. But maybe I'm wrong... obviously I should go
rake up some links, maybe later.

-- 
David A. Holland
dholland%netbsd.org@localhost