diff options
| author | Steve French <stfrench@microsoft.com> | 2018-09-18 21:05:18 +0200 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2018-10-24 04:16:04 +0200 |
| commit | 00778e2294d560361e2ed4e94cc003351a2d82d9 (patch) | |
| tree | f0f9f7b0c1ea14705eb2fc183a6c053e553da8a3 /fs/cifs/transport.c | |
| parent | cifs: minor updates to module description for cifs.ko (diff) | |
| download | linux-00778e2294d560361e2ed4e94cc003351a2d82d9.tar.xz linux-00778e2294d560361e2ed4e94cc003351a2d82d9.zip | |
smb3: add way to control slow response threshold for logging and stats
/proc/fs/cifs/Stats when CONFIG_CIFS_STATS2 is enabled logs 'slow'
responses, but depending on the server you are debugging a
one second timeout may be too fast, so allow setting it to
a larger number of seconds via new module parameter
/sys/module/cifs/parameters/slow_rsp_threshold
or via modprobe:
slow_rsp_threshold:Amount of time (in seconds) to wait before
logging that a response is delayed.
Default: 1 (if set to 0 disables msg). (uint)
Recommended values are 0 (disabled) to 32767 (9 hours) with
the default remaining as 1 second.
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>
Diffstat (limited to 'fs/cifs/transport.c')
| -rw-r--r-- | fs/cifs/transport.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c index 333729cf46cd..a1a1199578d5 100644 --- a/fs/cifs/transport.c +++ b/fs/cifs/transport.c @@ -113,9 +113,18 @@ DeleteMidQEntry(struct mid_q_entry *midEntry) cifs_small_buf_release(midEntry->resp_buf); #ifdef CONFIG_CIFS_STATS2 now = jiffies; - /* commands taking longer than one second are indications that - something is wrong, unless it is quite a slow link or server */ - if (time_after(now, midEntry->when_alloc + HZ) && + /* + * commands taking longer than one second (default) can be indications + * that something is wrong, unless it is quite a slow link or a very + * busy server. Note that this calc is unlikely or impossible to wrap + * as long as slow_rsp_threshold is not set way above recommended max + * value (32767 ie 9 hours) and is generally harmless even if wrong + * since only affects debug counters - so leaving the calc as simple + * comparison rather than doing multiple conversions and overflow + * checks + */ + if ((slow_rsp_threshold != 0) && + time_after(now, midEntry->when_alloc + (slow_rsp_threshold * HZ)) && (midEntry->command != command)) { /* smb2slowcmd[NUMBER_OF_SMB2_COMMANDS] counts by command */ if ((le16_to_cpu(midEntry->command) < NUMBER_OF_SMB2_COMMANDS) && |