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| author | Adrian Hunter <ext-adrian.hunter@nokia.com> | 2008-09-04 16:26:00 +0300 |
|---|---|---|
| committer | Artem Bityutskiy <Artem.Bityutskiy@nokia.com> | 2008-09-30 11:12:56 +0300 |
| commit | 2953e73f1ce4b3284b409aefb9d46bbde6515c37 (patch) | |
| tree | 56126c6a589bd0450eb288db6a93946e50e5bc29 /Documentation | |
| parent | 4793e7c5e1c88382ead18db5ca072bac54467318 (diff) | |
| download | kernel_samsung_tuna-2953e73f1ce4b3284b409aefb9d46bbde6515c37.zip kernel_samsung_tuna-2953e73f1ce4b3284b409aefb9d46bbde6515c37.tar.gz kernel_samsung_tuna-2953e73f1ce4b3284b409aefb9d46bbde6515c37.tar.bz2 | |
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')
| -rw-r--r-- | Documentation/filesystems/ubifs.txt | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/filesystems/ubifs.txt b/Documentation/filesystems/ubifs.txt index 340512c..dd84ea3 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 |