This patch updates text in SCST README about barriers usage
Signed-off-by: Vladislav Bolkhovitin <[email protected]>
README | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)
Index: scst/README
===================================================================
--- scst/README (revision 641)
+++ scst/README (working copy)
@@ -607,12 +607,11 @@ IMPORTANT: By default for performance re
On Linux initiators for EXT3 and ReiserFS file systems the
barrier protection could be turned on using "barrier=1" and
"barrier=flush" mount options correspondingly. Note, that
- usually it turned off by default and the status of barriers
- usage isn't reported anywhere in the system logs as well as
- there is no way to know it on the mounted file system (at
- least no known one). Windows and, AFAIK, other UNIX'es don't
- need any special explicit options and do necessary barrier
- actions on write-back caching devices by default. Also note
+ usually it's turned off by default (see http://lwn.net/Articles/283161).
+ You can check if it's turn on or off by looking in /proc/mounts.
+ Windows and, AFAIK, other UNIX'es don't need any special
+ explicit options and do necessary barrier actions on
+ write-back caching devices by default. Also note
that on some real-life workloads write through caching might
perform better, than write back one with the barrier
protection turned on.