spankaroo

RAMDisk to RAMDisk: same problem. Confirmed with SMB shared RAMDisk from Unraid. Unraid /dev/shm (RAMDisk) shared over SMB using smb-extras.conf [ramdisk] path = /dev/shm comment = browseable = yes write list = myuser valid users = myuser vfs objects = writeable = yes read only = no create mask = 0775 directory mask = 0775 Copy from WIndows 10 or Ubuntu box over 10GBE ... large video files copied from client to Unraid @ 1.1 GB/s. When copying from Unraid RAMDisk back to Windows or Ubuntu RAMDisk, getting max ~512 MB/s.

I'm interested in this -- very similar problem and have confirmed with Windows & Ubuntu clients -- also using ZFS. Don't assume ZFS is the problem -- have confirmed ZFS speeds. My config: Unraid w/ZFS on 20 core Xeon server w/ 128GB RAM. 16x6TB NAS Drives in RAID10 configuration (pool of mirrors), Optane 905p SLOG, NVME L2ARC. Local testing: With this configuration, I'm getting multi-GB/s reads and writes with local testing (as expected -- 'fio' and 'dd') Network testing: Iperf3 (server on Unraid box, client on various machines) -- all 9+GBE iperf3 results send/receive. Confirmed on Windows10 and Ubuntu client Real testing using SMB w/10GBE clients: - Windows 10: using RAMdisk copy large movie files to Unraid ZFS Samba share: write speed 1.1GB/s (perfect) -- : copy same movies back to Windows 10 RAMdisk ... @ ~500 MB/s peak - Ubuntu 20.04: using RAMdisk copy large movie files to Unraid ZFS Samba share: write speed 1.1GB/s -- : copy same movies back to Ubuntu RAMdisk ... @ ~500 MB/s peak Something is limiting my read-speeds from the Unraid server over SMB.