Hi, mora, I'm using NFSTest, which helps us a lot. I met with failures when running nfstest_cache in cases "acdirmin_data" and "acdirmax_data". The error message is as follows: FAIL: Directory listing should have not changed at t=0 FAIL: Directory listing should have not changed just before acdirmin PASS: Directory listing should have changed just after acdirmin My environment is as follows: 1. Linux kernel for NFS client: v6.7.0 2. NFSTest version: 3.2 3. Test command: nfstest_cache --client xxx --server xxx --export /ns1 --nfsversion=3 -m /mnt/test --datadir=data --runtest=acdirmin_data Both above cases have the same pattern: 1. Client 1: List some directory. 2. Client 2: add new dentry by mkdir() to the directory 3. Client 1: List the directory. The cases expect that Client 1 will use directory dentries cache in Step 1, and will not see the new dentry created by Step 2. After some time, client 1 will sync with the NFS server, and see the new dentry. However, in my environment, client 1 can see the new dentry at once after client 2 mkdir(). It seems that the NFS client can check if the directory has changed and get the latest entries. Could you give me some help? BTW, is there any instructions I can follow to make some contributions? Looking forward to your early reply. Best regards, Zhitao Li.