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12-20-2016

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Ethernet slow on ThinkPad P50

2021-09-14, 13:00 PM

I'm trying to discover the cause of frequent slow internet speeds on one of my computers. I have 500Mbps/50Mbps service and my primary computer rarely exceeds 50% downlink but usually has the full uplink capacity. Sometimes the downlink speed meets the promised speed.

 

An older computer that also has an Ethernet connection to the router (and all other devices on the network, both Ethernet and Wi-Fi) report the advertised speeds. The only problem is with my primary computer.

 

I don't see anything in the specs that would account for the problem. Some tests I have already tried:

  • Connected the primary computer to a different port on the router. No change.
  • Connected the primary computer using a different cable (both cables are CAT6). No change.
  • Connected the primary computer directly to the modem. No change.

Both computers report "Link speed (Receive/Transmit): 1000/1000 (Mbps)", but the primary computer routinely reports lower speeds on both the ISP's custom speed test and standard speed tests.

 

Main computer (ThinkPad): Speed Test 264.2 down and 53.4 up ping 9 jitter 2
Secondary computer (IdeaPad): Speed Test 527.7 down and 53.5 up ping 10 jitter 2

The tests were conducted consecutively (not concurrently).

 

Specs for the two systems are below. Are there other tests I can try to pinpoint the issue?

 

Thanks!


==COMPUTER #1 (primary) ThinkPad P50 == (slow Ethernet)
Link speed (Receive/Transmit): 1000/1000 (Mbps)
Link-local IPv6 address: fe80::43c:44d8:9d3c:afcc%11
IPv4 address: 192.168.1.198
IPv4 DNS servers: 8.8.8.8, 8.8.4.4
Manufacturer: Intel
Description: Intel(R) Ethernet Connection (2) I219-LM
Driver version: 12.18.9.8
Physical address (MAC): C8-5B-76-1B-C5-B4
Processor Intel(R) Xeon(R) CPU E3-1505M v5 @ 2.80GHz 2.81 GHz
Installed RAM 64.0 GB (63.9 GB usable)
System type 64-bit operating system, x64-based processor
Edition Windows 10 Pro
Version 21H2
Installed on ‎9/‎8/‎2021
OS build 19044.1165

 

==COMPUTER #2 (secondary) IdeaPad== (Ethernet as expected)
Link speed (Receive/Transmit): 1000/1000 (Mbps)
Link-local IPv6 address: fe80::3cc9:f1a6:7f9a:4fb7%16
IPv4 address: 192.168.1.231
IPv4 DNS servers: 8.8.8.8, 8.8.4.4
Manufacturer: Qualcomm Atheros
Description: Qualcomm Atheros AR8171/8175 PCI-E Gigabit Ethernet Controller (NDIS 6.30)
Driver version: 2.1.0.16
Physical address (MAC): 28-D2-44-1C-E8-BF
Processor Intel(R) Core(TM) i7-4700MQ CPU @ 2.40GHz 2.40 GHz
Installed RAM 12.0 GB (11.8 GB usable)
System type 64-bit operating system, x64-based processor
Edition Windows 10 Home
Version 21H1
Installed on ‎8/‎7/‎2020
OS build 19043.1165

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2899 Posts

06-13-2013

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Re:Ethernet slow on ThinkPad P50

2021-09-14, 20:46 PM

I don't have an immediate answer. But of course your numbers do seem to confirm that the P50 is downloading at half the speed of the Ideapad, both with a gigabit NIC and the same ISP/router/cabling.

 

So just as part of the data gathering process, might I suggest a very small investment in an affordable external gigabit ethernet/USB-c adapter like this one. I use it on an HP laptop I was sent to use (for a business remote connection assignment) but they didn't also send me a dock station. The HP laptop didn't have an ethernet port to take advantage of my own wired internet option. So I bought that inexpensive external ethernet adapter and it's worked great.

 

Again, no answer or solution yet or confirmation yet, as to whether the Intel I219-LM in the P50 is malfunctioning as it seems to be. But if this alternate wired gigabit ethernet option does give you the 500Mb/s download speed it would at least be interesting to know. And if so, it also does give you an optional permanent workaround.

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3722 Posts

01-08-2021

Philippines

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  • Message 2 of 11

Re:Ethernet slow on ThinkPad P50

2021-09-14, 17:01 PM

Hello TechByter,

 


Greetings

 

 

To troubleshoot slow Ethernet connection issue on your ThinkPad P50, let's begin by reloading the default BIOS settings, be sure to save before exiting. 
Next step is to update the BIOS, drivers and firmware thru the support site.
I see that there's a recently released BIOS last September 13 2021, version 1.65.
Once done restart your computer then follow the recommended steps from the links below:

https://www.intel.com/content/www/us/en/support/articles/000056817/ethernet-products.html

 

https://support.lenovo.com/us/en/solutions/ht105732-troubleshooting-ethernet-network-connectivity-issues

Update us how it goes.

 


Regards, 
Lorenzo_Lenovo



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23 Posts

12-20-2016

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Re:Ethernet slow on ThinkPad P50

2021-09-14, 17:24 PM

Thanks. I probably won't be able to work this in until tomorrow. I'll let you know how it goes. I had considered a driver previously, but considered that less likely because sometimes the connections are as they should be.

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2899 Posts

06-13-2013

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  • Message 4 of 11

Re:Ethernet slow on ThinkPad P50

2021-09-14, 20:46 PM

I don't have an immediate answer. But of course your numbers do seem to confirm that the P50 is downloading at half the speed of the Ideapad, both with a gigabit NIC and the same ISP/router/cabling.

 

So just as part of the data gathering process, might I suggest a very small investment in an affordable external gigabit ethernet/USB-c adapter like this one. I use it on an HP laptop I was sent to use (for a business remote connection assignment) but they didn't also send me a dock station. The HP laptop didn't have an ethernet port to take advantage of my own wired internet option. So I bought that inexpensive external ethernet adapter and it's worked great.

 

Again, no answer or solution yet or confirmation yet, as to whether the Intel I219-LM in the P50 is malfunctioning as it seems to be. But if this alternate wired gigabit ethernet option does give you the 500Mb/s download speed it would at least be interesting to know. And if so, it also does give you an optional permanent workaround.

0 person found this solution to be helpful.

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4368 Posts

12-02-2007

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  • Message 5 of 11

Re:Ethernet slow on ThinkPad P50

2021-09-15, 7:16 AM

Hello,


Have you tried booting the ThinkPad P50 from a USB flash drive with a Linux distro on it to see if that makes any difference in speed?  If there is, that could indicate an issue with the Windows installation on the device.

 

Regards,

 

Aryeh Goretsky

 



I am a volunteer and neither a Lenovo nor a Microsoft employee.

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23 Posts

12-20-2016

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  • Message 6 of 11

Re:Ethernet slow on ThinkPad P50

2021-09-15, 10:39 AM

Good idea. Thanks, I'll give that a try. Possibly not for a few days -- the week has become busy.

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549 Posts

12-24-2011

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  • Message 7 of 11

Re:Ethernet slow on ThinkPad P50

2021-09-15, 18:50 PM

I just tested two machines with I219-LM against my ISP wired connection:

(I noticed you use a beta version of Windows on your P50?)

 

P50: Intel(R) Core(TM) i7-6820HQ CPU @ 2.70GHz   2.71 GHz

Windows 10 Pro

21H1, 19043.1165

Driver 12.18.9.8

Speedtest: 591Mbps down, 158.99 Mbps up, 2 ms ping

 

P51: Intel(R) Xeon(R) CPU E3-1505M v5 @ 2.80GHz   2.81 GHz

Windows 10 Pro for Workstations

21H1, 19043.1202

Driver 12.18.9.8

Speedtest: 592Mbps down, 156.11 Mbps up, 2 ms ping

 

Sometimes speedtest numbers are like a voodoo, but there should not be anything systematically wrong with P50 and the driver you have.

(based on my testing.) You could attempt a reset of any network tuning options that  might have been applied by running "netsh int ip reset" and try again?

If you have a fast Wifi router you could also test the speed you are getting on the P50 though wifi, is it higher than wired?

 

For example I get Speedtest: 490.63Mbps down on my P50 wireless.

If your ISP applies bandwith shaping, your first speedtest result might be lower that consecutive runs as well.

 

Or is it a simple reminder to avoid Windows 11 at all costs? At any rate it is not supported on P50/P51 :)

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23 Posts

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  • Message 8 of 11

Re:Ethernet slow on ThinkPad P50

2021-09-16, 19:24 PM

Thanks to everyone who offered suggestions. I selected this option to try first because it's been busy around here and it made sense to try the easiest possible solution first, particularly considering the low cost (about $15) of a Type C adapter. The downlink and uplink speeds now are in line with the other devices that are connected by Ethernet or Wi-Fi. The two tests shown here are with the built-in Ethernet adapter and then the Thunderbolt Ethernet adapter.

 

Results

 

I had to wait a day for the new adapter to be delivered, but then the installation time was less than a minute.

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2899 Posts

06-13-2013

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  • Message 9 of 11

Re:Ethernet slow on ThinkPad P50

2021-09-16, 20:32 PM

@ TechByter wrote:

I selected this option to try first because it's been busy around here and it made sense to try the easiest possible solution first, particularly considering the low cost (about $15) of a Type C adapter. The downlink and uplink speeds now are in line with the other devices that are connected by Ethernet or Wi-Fi.

 

I had to wait a day for the new adapter to be delivered, but then the installation time was less than a minute.

 

Excellent news! There you have it!

 

Of course we still don't have the satisfaction and closure of a real explanation software or hardware for why the built-in Intel I219-LM NIC is not performing up to snuff, as all the other possible areas for investigation haven't really been pursued at least here on this thread. But I'm sure you spent lots of time on this before posting your issue here, though you never did say whether the P50 ever previously did provide your 500/50 performance and only recently started not to, which would be interesting to know.

 

Also, the questions about being up-to-date all around like on BIOS, drivers, etc. were not fully pursued here, at least on this thread. But given that you show you're actually already on 21H2 as of just a few days ago and also do have the latest LAN driver version installed suggests you're probably fully up to date on everything you possibly could be up to date on. Of course it would have been nice to have closure on learming about either a hardware or software cause for the apparent 1/2 max-possible upload/download speeds you are getting via the built-in RJ45 port. But in the end the real goal was to obtain those speeds. 

 

So with a mere $15 magic gizmo to allow the alternative of utilizing an otherwise unused Thunderbolt port for a second wired ethernet option the case is now closed with a happy ending. You have emerged victorious and obtained your objective, without lots of energy, effort, and troubleshooting time spent perhaps fruitlessly in the end anyway.

 

Glad my suggestion solved your issue.

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23 Posts

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  • Message 10 of 11

Re:Ethernet slow on ThinkPad P50

2021-09-16, 21:05 PM
  • I don't know if the built-in port would have delivered 500Mbps earlier because I was on a 100Mbps plan until about four weeks ago, so even 238Mbps was faster than I was used to. I thought the ISP was underdelivering until I checked the speeds on other devices.
  • I agree that the drivers should be up to date, but I'll still check when time is available.
  • To the best of my knowledge, the only CMOS setting that's ever been changed is the boot order, but that's also on my list of things to check when I can.
  • And booting to a Linux thumb drive is also something I'll pursue. I should have one around here somewhere and, if not, it'll be easy enough to make one.
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