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authorAdrian Hunter <ext-adrian.hunter@nokia.com>2008-09-04 16:26:00 +0300
committerArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2008-09-30 11:12:56 +0300
commit2953e73f1ce4b3284b409aefb9d46bbde6515c37 (patch)
tree56126c6a589bd0450eb288db6a93946e50e5bc29 /Documentation/filesystems
parent4793e7c5e1c88382ead18db5ca072bac54467318 (diff)
UBIFS: add no_chk_data_crc mount option
UBIFS read performance can be improved by skipping the CRC check when data nodes are read. This option can be used if the underlying media is considered to be highly reliable. Note that CRCs are always checked for metadata. Read speed on Arm platform with OneNAND goes from 19 MiB/s to 27 MiB/s with data CRC checking disabled. Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com>
Diffstat (limited to 'Documentation/filesystems')
-rw-r--r--Documentation/filesystems/ubifs.txt6
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/filesystems/ubifs.txt b/Documentation/filesystems/ubifs.txt
index 340512c3250..dd84ea3c10d 100644
--- a/Documentation/filesystems/ubifs.txt
+++ b/Documentation/filesystems/ubifs.txt
@@ -89,6 +89,12 @@ fast_unmount do not commit on unmount; this option makes
bulk_read read more in one go to take advantage of flash
media that read faster sequentially
no_bulk_read (*) do not bulk-read
+no_chk_data_crc skip checking of CRCs on data nodes in order to
+ improve read performance. Use this option only
+ if the flash media is highly reliable. The effect
+ of this option is that corruption of the contents
+ of a file can go unnoticed.
+chk_data_crc (*) do not skip checking CRCs on data nodes
Quick usage instructions