Module Name: src
Committed By: jdolecek
Date: Fri Oct 28 20:30:37 UTC 2016
Modified Files:
src/doc/roadmaps: storage
Log Message:
adjust the nvme entry; the flush cache is now asynchronous, and be more
specific for the get/set cache entry too
To generate a diff of this commit:
cvs rdiff -u -r1.18 -r1.19 src/doc/roadmaps/storage
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/doc/roadmaps/storage
diff -u src/doc/roadmaps/storage:1.18 src/doc/roadmaps/storage:1.19
--- src/doc/roadmaps/storage:1.18 Wed Sep 21 20:32:47 2016
+++ src/doc/roadmaps/storage Fri Oct 28 20:30:37 2016
@@ -1,4 +1,4 @@
-$NetBSD: storage,v 1.18 2016/09/21 20:32:47 jdolecek Exp $
+$NetBSD: storage,v 1.19 2016/10/28 20:30:37 jdolecek Exp $
NetBSD Storage Roadmap
======================
@@ -225,14 +225,14 @@ Semi-relatedly, it is also time for scsi
- The nvme driver is a backend to ld(4) which is MPSAFE, but we still
need to attend to I/O path bottlenecks. Better instrumentation
is needed.
- - Flush cache commands via DIOCCACHESYNC is currently implemented using polled
- commands for simplicity, limiting speed to about 10 milliseconds due to use
- of delay(9); investigate if it's worth changing this to a cv to avoid
- the delay, especially for journalled/heavy fsync scenarios
+ - Flush cache commands via DIOCCACHESYNC currently doesn't wait for completion;
+ it must not poll since that corrupts command queue, but it should use
+ a condition variable to wait for the flush to actually finish
- NVMe controllers supports write cache administration via GET/SET FEATURE, but
driver doesn't currently implement the cache ioctls, leading to somewhat
ugly dkctl(1) output; it would be fairly simple to add this, but would
- require small changes to ld(4) attachment code
+ require ld(4) attachment code changed to support passing arbitrary ioctls
+ to attachments
- There is no clear timeframe or release target for these points.
- Contact msaitoh or agc for further information.
