[PATCH][SMB3] update readme to correct information about /proc/fs/cifs/Stats
smfrench at gmail.com
Wed Aug 1 06:16:12 UTC 2018
[PATCH] smb3: update readme to correct information about
Signed-off-by: Steve French <stfrench at microsoft.com>
Documentation/filesystems/cifs/README | 22 ++++++++++------------
1 file changed, 10 insertions(+), 12 deletions(-)
diff --git a/Documentation/filesystems/cifs/README
index 99ce3d25003d..4a804619cff2 100644
@@ -603,8 +603,7 @@ DebugData Displays information about active
CIFS sessions and
shares, features enabled as well as the cifs.ko
Stats Lists summary resource usage information as well as per
- share statistics, if CONFIG_CIFS_STATS in enabled
- in the kernel configuration.
+ share statistics.
SecurityFlags Flags which control security negotiation and
@@ -687,23 +686,22 @@ cifsFYI functions as a bit mask. Setting it to 1
enables additional kernel
logging of various informational messages. 2 enables logging of non-zero
SMB return codes while 4 enables logging of requests that take longer
than one second to complete (except for byte range lock requests).
-Setting it to 4 requires defining CONFIG_CIFS_STATS2 manually in the
-source code (typically by setting it in the beginning of cifsglob.h),
-and setting it to seven enables all three. Finally, tracing
+Setting it to 4 requires CONFIG_CIFS_STATS2 to be set in kernel configuration
+(.config). Setting it to seven enables all three. Finally, tracing
the start of smb requests and responses can be enabled via:
echo 1 > /proc/fs/cifs/traceSMB
-Per share (per client mount) statistics are available in /proc/fs/cifs/Stats
-if the kernel was configured with cifs statistics enabled. The statistics
-represent the number of successful (ie non-zero return code from the server)
-SMB responses to some of the more common commands (open, delete, mkdir etc.).
+Per share (per client mount) statistics are available in /proc/fs/cifs/Stats.
+Additional information is available if CONFIG_CIFS_STATS2 is enabled in the
+kernel configuration (.config). The statistics returned include counters which
+represent the number of attempted and failed (ie non-zero return code from the
+server) SMB3 (or cifs) requests grouped by request type (read, write,
Also recorded is the total bytes read and bytes written to the server for
that share. Note that due to client caching effects this can be less than the
number of bytes read and written by the application running on the client.
-The statistics for the number of total SMBs and oplock breaks are different in
-that they represent all for that share, not just those for which the server
+Statistics can be reset to zero by "echo 0 > /proc/fs/cifs/Stats" which may be
+useful if comparing performance of two different scenarios.
Also note that "cat /proc/fs/cifs/DebugData" will display information about
the active sessions and the shares that are mounted.
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