March 29, 20224 yr My unraid NAS does have a Realtek onboard NIC: [10ec:8168]03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 0c) When I upload via SMB something from my computer to NAS I reach 114MB/s transfer speed (displayed in Windows Explorer) When I download via SMB something from my NAS to my computer I reach only 85MB/s transfer speed (displayed in Windows Explorer) When I perform iperf3 I get the following results, which matches to the upload transfer speed experience: ➜ ~ iperf3 -c NAS Connecting to host NAS, port 5201 [ 5] local COMPUTER port 49409 connected to NAS port 5201 [ ID] Interval Transfer Bitrate [ 5] 0.00-1.00 sec 110 MBytes 920 Mbits/sec [ 5] 1.00-2.00 sec 111 MBytes 935 Mbits/sec [ 5] 2.00-3.00 sec 109 MBytes 917 Mbits/sec [ 5] 3.00-4.00 sec 112 MBytes 937 Mbits/sec [ 5] 4.00-5.00 sec 111 MBytes 934 Mbits/sec [ 5] 5.00-6.00 sec 111 MBytes 932 Mbits/sec [ 5] 6.00-7.00 sec 111 MBytes 934 Mbits/sec [ 5] 7.00-8.00 sec 111 MBytes 932 Mbits/sec [ 5] 8.00-9.00 sec 111 MBytes 929 Mbits/sec [ 5] 9.00-10.00 sec 110 MBytes 924 Mbits/sec - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bitrate [ 5] 0.00-10.00 sec 1.08 GBytes 930 Mbits/sec sender [ 5] 0.00-10.01 sec 1.08 GBytes 926 Mbits/sec receiver iperf Done. When I do only reverse the result is matching my download transfer speed experience: ➜ ~ iperf3 -c NAS -R Connecting to host NAS, port 5201 Reverse mode, remote host NAS is sending [ 5] local COMPUTER port 49782 connected to NAS port 5201 [ ID] Interval Transfer Bitrate [ 5] 0.00-1.00 sec 86.2 MBytes 723 Mbits/sec [ 5] 1.00-2.00 sec 84.2 MBytes 706 Mbits/sec [ 5] 2.00-3.00 sec 84.1 MBytes 705 Mbits/sec [ 5] 3.00-4.00 sec 82.3 MBytes 690 Mbits/sec [ 5] 4.00-5.00 sec 84.0 MBytes 705 Mbits/sec [ 5] 5.00-6.00 sec 87.1 MBytes 730 Mbits/sec [ 5] 6.00-7.00 sec 84.0 MBytes 705 Mbits/sec [ 5] 7.00-8.00 sec 82.3 MBytes 690 Mbits/sec [ 5] 8.00-9.00 sec 67.4 MBytes 565 Mbits/sec [ 5] 9.00-10.00 sec 59.3 MBytes 498 Mbits/sec - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bitrate Retr [ 5] 0.00-10.00 sec 805 MBytes 675 Mbits/sec 1 sender [ 5] 0.00-10.00 sec 801 MBytes 672 Mbits/sec receiver iperf Done. Does anyone have an idea why the transfer speed is so different? What could I do to have the same experience for downloading from NAS as I do have when uploading?
March 29, 20224 yr Community Expert Iperf confirms the issue is LAN related, probably the NIC since Realtek NICs driver support in Linux is a crapshoot, but could also be related to the switch, cable or the other PC.
March 30, 20224 yr Author It seems the driver in unraid is from 2013. On another linux server with debian with same NIC the driver is from 2015. How can I make a request to update the driver?
March 31, 20224 yr Hello mate, i have a similar issue, i fix forcing my windows 10 realtek card to 1000mbps full duplex into the config's of the card, just try and let me know
March 31, 20224 yr Author Hey Ronan, thank you for your reply and suggestion. Unfortunately it doesn't help to speedup the speed.
March 31, 20224 yr I have had all sorts of bizarre issues with a fairly new TP-Link managed switch and various Realtek gigabit NICs and one random mobo with a Marvell NIC (what a turd). Either the link would be unreliable or simply perform "wrong" or go down to 100Mbps randomly. No such issues with any other switch (including TP-Link unmanaged switches) nor the Realtek 2.5g NIC in my main desktop. I ended up resolving the problem by replacing the switch, although the issue did seem to be driver dependent as with some OS's the problem would never happen, while on some OS's it would be fine. Anyway, do me a favor, try a different ethernet cable and a different switch (or if directly connected to your router, throw an unmanaged switch in between). If that doesn't work, Intel NIC time they are cheap on eBay
April 1, 20224 yr Author I am pretty sure that the problem is the driver used in unraid. When I boot debian linux with 'apt install firmware-realtek' the speed is 1Gbs in both directions. Howevery, I tried another cable (different manufacturer) without success. I don't have other switches than ubiquiti, so I cannot test with another switch. But I tried with cross over cableling and this also doesn't improve the speed with unraid.
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