[Samba] CIFS client mounts meta ops 30 times slow than server

[Jeremy Allison]

On Thu, Mar 09, 2023 at 07:29:28PM +0100, Ralph Boehme via samba wrote:
>On 3/9/23 19:16, Shenyue Chen via samba wrote:
>>Also from my observation, based on network packets and time measurements,
>>it seems the CIFS clients haven't done any sort of cache.
>>
>>For example, doing a "ls" for 5 times on the same folder within a
>>short period of time. The network packet sizes are almost equal every time
>>and the time it takes is similar.
>>
>>Isn't there supposed to be some page cache or dentry cache that could
>>accelerate this, under the loose cache policy? Or is this the expected
>>behavior?
>not sure about how the client may cache directories on SMB mounts. 
>There's a protocol feature that deals with this, Directory Leases, but 
>unfortunately we don't implement this yet due to lack of funding.

I'm also not sure the cifsfs client implements this yet.
Maybe Steve or other cifsfs developers can chime in.