Hi,
We observed performance is mainly hurt while .glusterfs is having huge data.As we know before executing a fop in POSIX xlator it builds an internal path based on GFID.To validate the path it call's (l)stat system call and while .glusterfs is heavily loaded kernel takes time to lookup inode and due to that performance dropsTo improve the same we tried two things with this patch(https://review.gluster.org/#/c/glusterfs/+/23783/)
1) To keep the first level entry always in a cache so that inode lookup will be faster we have to keep open first level fds(00 to ff total 256) per brick at the time of starting a brick process. Even in case of cache cleanup kernel will not evict first level fds from the cache and performance will improve
2) We tried using "at" based call(lstatat,fstatat,readlinat etc) instead of accessing complete path access relative path, these call's were also helpful to improve performance.
Regards,
Mohit Agrawal
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