Downloadspeed slow, uploadspeed good

[NilsonNeo4]

Hi,

 

I am quiet new to unraid. So far everything works fine or I cloud solve it by googling and reading the forum. 

But with this problem I haven't found a solution yet so I ask you.

 

I run Unraid 6.11.5 on an Mini-PC with i5-7500T and 16 GB RAM. Only drive is a WD blue nvme SSD with 2 TB (WD_Blue_SN570_2TB)

Array is using xfs with encryption. Installed plugins are: "CA Backup / Restore Appdata" + "Dynamix File Manager"

 

Problem is, download seems to be limited to around 500 MBit/s in a GBit network

Initial Test done by copying a large file via smb

 

Upload seems fine

 

output of iperf shows the same picture

unraid -> PC (download)

[ ID] Interval           Transfer     Bandwidth       Retr
[  4]   0.00-10.00  sec   558 MBytes   468 Mbits/sec    0             sender
[  4]   0.00-10.00  sec   556 MBytes   466 Mbits/sec                  receiver

PC -> unraid (upload)

[ ID] Interval           Transfer     Bandwidth
[  4]   0.00-20.00  sec  2.20 GBytes   947 Mbits/sec                  sender
[  4]   0.00-20.00  sec  2.20 GBytes   947 Mbits/sec                  receiver

 

same if i am using the OpenSpeedTest Docker 

 

I also tried downloading directly using the Dynamix File Manager. Same picture

so i think it is not a smb problem.

 

the drive itselfe seems fine 

hdparm -tT /dev/nvme0n1

/dev/nvme0n1:
 Timing cached reads:   21352 MB in  1.98 seconds = 10766.71 MB/sec
 Timing buffered disk reads: 6286 MB in  3.00 seconds = 2094.71 MB/sec

 

I can see this behavior with two PCs. One Windows 10, one Windows 11.

 

See attached the server diagnostics package. 

 

Can someone point me in the right direction? 

 

BR

 

NilsonNeo4

 

server-diagnostics-20230312-1046.zip

Edited March 12 by NilsonNeo4
typos, clarifications

[JorgeB]

Since iperf show the same issue you should start with the LAN, that can be NIC (including NIC settings), cables, switch or client PC.

[Civic1201]

I have the same issues even with no antivirus. When using Manjaro everything is fine.

[NilsonNeo4]

Hi thanks for the reply 

 

setting of eth0 is: 1000 Mbps, full duplex, mtu 1500

 

I tried connecting my laptop directly to the server (using a different/new cable): no change

I tried booting a live-Linux on my PC to rule out windows/driver issues: no change

I tried a Linux VM directly on the server, connected to br0: here is everything ok.

 

So it seems that something is wrong with the NIC. Hardware oder setting.

I will try to boot the server with a live-Linux to test once I have time for that. 

 

It cloud be a coincidence but it is suspicions that the download is limited to 500 MBit/s, so half of GBit. Is there maybe some QoS etc. in the system I am not aware of?

 

Edit: Tried booting a live-Linux on my server an did an iperf to my PC. Up- and Download are fine. So it must be a setting in unraid. 

Edited March 12 by NilsonNeo4
live-Linux on Server

[JorgeB]

Look for the tips and tweaks plugin, there are some NIC settings there that can make a difference.

[NilsonNeo4]

Thanks,

 

I disabled TCP offload. Now I have around 850 MBit/s. Still not full Gbit, but much better.