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smb3: update readme to correct information about /proc/fs/cifs/Stats

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Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>
This commit is contained in:
Steve French
2018-08-01 01:13:55 -05:00
parent c281bc0c74
commit 3de5e974ba
1 changed files with 10 additions and 12 deletions
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22
Documentation/filesystems/cifs/README
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@@ -603,8 +603,7 @@ DebugData Displays information about active CIFS sessions and
shares, features enabled as well as the cifs.ko shares, features enabled as well as the cifs.ko
version. version.
Stats Lists summary resource usage information as well as per Stats Lists summary resource usage information as well as per
share statistics, if CONFIG_CIFS_STATS in enabled share statistics.
in the kernel configuration.
Configuration pseudo-files: Configuration pseudo-files:
SecurityFlags Flags which control security negotiation and 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 logging of various informational messages. 2 enables logging of non-zero
SMB return codes while 4 enables logging of requests that take longer SMB return codes while 4 enables logging of requests that take longer
than one second to complete (except for byte range lock requests). than one second to complete (except for byte range lock requests).
Setting it to 4 requires defining CONFIG_CIFS_STATS2 manually in the Setting it to 4 requires CONFIG_CIFS_STATS2 to be set in kernel configuration
source code (typically by setting it in the beginning of cifsglob.h), (.config). Setting it to seven enables all three. Finally, tracing
and setting it to seven enables all three. Finally, tracing
the start of smb requests and responses can be enabled via: the start of smb requests and responses can be enabled via:
echo 1 > /proc/fs/cifs/traceSMB echo 1 > /proc/fs/cifs/traceSMB
Per share (per client mount) statistics are available in /proc/fs/cifs/Stats Per share (per client mount) statistics are available in /proc/fs/cifs/Stats.
if the kernel was configured with cifs statistics enabled. The statistics Additional information is available if CONFIG_CIFS_STATS2 is enabled in the
represent the number of successful (ie non-zero return code from the server) kernel configuration (.config). The statistics returned include counters which
SMB responses to some of the more common commands (open, delete, mkdir etc.). 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, close etc.).
Also recorded is the total bytes read and bytes written to the server for 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 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. 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 Statistics can be reset to zero by "echo 0 > /proc/fs/cifs/Stats" which may be
that they represent all for that share, not just those for which the server useful if comparing performance of two different scenarios.
returned success.
Also note that "cat /proc/fs/cifs/DebugData" will display information about Also note that "cat /proc/fs/cifs/DebugData" will display information about
the active sessions and the shares that are mounted. the active sessions and the shares that are mounted.