Slow SMB speed beetween Windows machines

[ravenich]

Hello. I have problem with slow file transfer speed beetween Windows VM and Windows physical machine.
Virtual Environment 5.1-46 4.13.16-1-pve
PC-1 (physical):
IP addr: 192.168.0.195/24
Windows 10 x64
CrystalDisk 6

PC-2 (VM):
IP addr: 192.168.0.72/24
Windows 7 x86

Crystal Disk 6


1 Gb link beetween machines:
Iperf:

Everething looks fine
But, when i copy (for example) 4,6 Gb install.wim file from PC-1 to PC-2 (from physical to VM) speed is really low:

How can i improve transfer speed?

 

[dcsapak]

i guess your disk is too slow, try running the disk benchmark with bigger files (instead of 1gb)
the copy graph suggests, that the memory is running full and writing to disk is simply slow
(also 512mb and only one core for a windows vm is very low)

 

[ravenich]

i guess your disk is too slow, try running the disk benchmark with bigger files (instead of 1gb)
the copy graph suggests, that the memory is running full and writing to disk is simply slow
(also 512mb and only one core for a windows vm is very low)

I've changed cpu core to 2 and added 512 Gb of RAM:

CrystalDiskMark 6 (16 GB test):

But copy speed is the same (average 15 MB/s):

 

[dcsapak]

what is your underlying storage of both servers? the disk benchmark has awfull 4k values, so depending on how samba writes/reads
that can be the issue

 

[ravenich]

what is your underlying storage of both servers? the disk benchmark has awfull 4k values, so depending on how samba writes/reads
that can be the issue

On the proxmox i use local storage (WDC-WD10EZEX 1Tb), one disk, no raid. On the physical machine same model.

 

[ravenich]

Just for test i shutdown windows VM and create debian 9 linux vm with 256 mb RAM and one core. Install samba and share a directory.
Speed from the same physical machine to VM:

 

[dcsapak]

then i guess the problem is somewhere inside the windows 7 smb server

 

[ravenich]

then i guess the problem is somewhere inside the windows 7 smb server

Hmm, i have another proxmox server in production. There are windows and linux VM's and situation the same. From physical Windows to VM Windows speed is very slow, from physical Windows to VM linux speed is fast. VM Windows is 2 sockets 2 core 4GB RAM, Windows 2008.
Proxmox version on the prod server is 5.1-46. Local storage RAID10 (4 x WD10EZEX 1Tb).

I can install another disk (seagate maybe), create storage and move vm disk to it and test speed again.

I remembered that i upgrade this (test) proxmox machine from version 4. Maybe problem in that?

 

[dcsapak]

I remembered that i upgrade this (test) proxmox machine from version 4. Maybe problem in that?

this should not make a difference

I can install another disk (seagate maybe), create storage and move vm disk to it and test speed again.

for ruling out the disk, yeah this could help

could you also test with a window 10 vm as smb server? maybe windows 10 does not like the 'old' smb servers

 

[ravenich]

Here some tests (WDC_WD20EADS-65R - green disk, WDC_WD10EZEX-00W - blue disk):
I find physycal machine with Win7 and added to test
Physical machine with win7:

Speed beetween physical win7 and physical win 10:

Speed beetween physical win10 and physical win7:


I create new VM and install clean Win 7, here is config with blue disk:

Crystal disk (blue disk) (maybe error on write speed):

Physical W7 to VM W7 (blue) avg - 20 MB - really slow:

Physical W10 to VM W7 (blue) avg - 30-35 MB - slow:


Also i created VM with win10:
Config - with blue disk:

Physical W7 to VM W10 avg 50-60 really good:

Physical W10 to VM W10 avg 50-60 really good:

 

[ravenich]

And same tests but with green disk:
W7 VM:

pW7 to vW7:

pW10 to vW7:


W10 VM - green disk:

pW7 to vW10:

pW10 to vW10:

 

[killmasta93]

why arent you using Virt disk?

 

[ravenich]

why arent you using Virt disk?

Recomendation from proxmox wiki
"
Proxmox recommends using SCSI with VirtIO SCSI as SCSI Controller Type for VM disks, to have the most features and best performance.

VirtIO block may get deprecated in the future.
"

 

[killmasta93]

I would give it a go with Virt0 look at my speeds

https://imgur.com/a/qJs69iQ