Windows 10 Slow Download Fast Upload Ethernet

03 November 2018

Hey

I did a bit of research on this matter and I'thou pretty certain I have narrowed it down to windows

DefaultSendWindow being fix also depression for mod networks.

Where can I edit this setting in windows to force a unlike tcp buffer length size.

I found this on internet TCP Window size problems

and this in that post

You can exercise that past editing the registry key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\AFD\Parameters\DefaultSendWindow

But this is empty on my stop and I don't know what values I should put in to configure that.

A more 10gbe related topic on this I accept posted on this forum, in case any1 is interested.
10gb SFP + network setup - deadening windows TCP Transfer - Spiceworks

From my tests over there you lot can see that the windows is the issue of slow transfer speeds and not hardware/zfs/freenas.

Regards
Dariusz

03 Nov 2018

Windows will conform the TCP Window, depending on the package size and CRC. If you are using a 10GB connexion, your problem would be with the CPU, not the network adapter or Windows.

04 Nov 2018

Hey all

Thanks for help & ideas!

@bro67 I have two ethernet connections, one for net, i for private offline network. the internet one is 1GB the Individual one is 10GB. Maybe windows takes the test result from the 1GB net network and applies to all interfaces, not sure. I don't think its the CPU, as you can run across on the other forum where I posted Jperf results. Too how can it be cpu if I can upload to NAS at speed of 300MB but only download at 100MB ? Does not make sense. I was able to download at 700MB+ on old workstation and this i is even faster.

@Samuria - I just run tests, Used this for guide : Changing the MTU size in Windows Vista, 7 or 8 (mtu, speed, windows, Windows 7, Windows viii, Windows Vista)
, I tried 3000 and 9000. No modify :- (

@TairikuOkami - I will cheque it out today. Thanks!

I also went over this post A word about AutoTuningLevel Hybrid Networking | Cloud and OnPrem
Seems to be latest -about up to date information.

I'm fairly sure its downwardly tow indows. Seeing how often MS changers/tweaks TCP managment system. Old windows which was installed similar 3 years ago worked quite fast out of the box with 10GB connectedness. The new windows does non the only conclusion I can come with is that there is a setting buried somewhere that is messing stuff upwardly.

Cheers all for help, will keep it posted if I figure it out.

04 Nov 2018

The 10GB network is just going to be equally fast as the data the reckoner is routing from the 1GB network adapter. 10GB cards are meant for Fibre connections that you are getting very fast connections coming in, not for slow Internet 1GB or beneath. If this is for a test bench for playing around with network equipment on the Internal LAN, you lot are going to bargain with packets not being too large for WAN. Depending on how fast the computer is that y'all are using as your Router, information technology depends on how well the 10GB is going to run.

Playing with the tuning is not going to fix annihilation.

05 November 2018

Hey
@bro67
I'chiliad non certain where the defoliation is coming. I'm sorry if I'm unclear somehow. to put it simply TL

R The hardware is not the problem, old windows yielded 800MB/DL and 300MB/Up. New windows yields 100MB/DL and 300MB/UL. There is NO HARDWARE LIMITATION Hither. I merely installed windows on new workstation - now workstation is not your boilerplate pc here. Its 2990WX based rig running Grand.2 equally just drivers. There is also no transfer happening between the 1Gb network and 10Gb one. The 1Gb is intended for internet access and 10Gb for internal nas/data transfer. The Jperf tests do evidence that if I modify the buffer size from default to sixteen/32mb I'm getting fast transfers. So information technology the event must be Bone.

(I retrieve its 1Gb not 1GB right? Still getting a hang of the gbGBGb names).

Also the more than I await in to information technology the more I see people having the same bug on FreeNAS forum. Where they have 300MB limit of information transfer. Problem is that at that place is nothing that tin be changed other than tunables. And then not certain what else to seize with teeth there. So I'm fairly certain its the windows. As my old Windows worked better than the electric current one.

xv Mar 2020

Dariusz said:

Hey
@bro67
I'one thousand not sure where the confusion is coming. I'm sorry if I'm unclear somehow. to put information technology simply TLR The hardware is not the problem, onetime windows yielded 800MB/DL and 300MB/UP. New windows yields 100MB/DL and 300MB/UL. In that location is NO HARDWARE LIMITATION Here. I simply installed windows on new workstation - now workstation is not your average pc here. Its 2990WX based rig running M.2 as simply drivers. There is also no transfer happening between the 1Gb network and 10Gb one. The 1Gb is intended for internet admission and 10Gb for internal nas/data transfer. The Jperf tests practise bear witness that if I change the buffer size from default to 16/32mb I'k getting fast transfers. And so it the upshot must be Bone.

(I think its 1Gb not 1GB right? Notwithstanding getting a hang of the gbGBGb names).

Besides the more I wait in to it the more I see people having the same problems on FreeNAS forum. Where they have 300MB limit of data transfer. Problem is that there is nada that tin be changed other than tunables. And then not certain what else to bite in that location. So I'm fairly sure its the windows. As my onetime Windows worked better than the current one.

@Dariusz I know this is an older thread but was at that place ever a resolution to this? I am having a like consequence and seem to take wearied the knowledgebase of the cyberspace.

03 Aug 2020

Anim8me2 said:

@Dariusz I know this is an older thread but was there always a resolution to this? I am having a similar issue and seem to have exhausted the knowledgebase of the internet.

Yeh I managed to get it run fast at the end. But so did format 2 days ago and I'm back to being slow again! WRRRRRrrrr!!!!

Right now I'g 500-750 upload and 40-50 download, ehhh equally if for some reason incoming packets to windows are somehow damaged or something ;/

Googling again on how to fix that.

Looks similar I had some luck hither > 10gb SFP + network setup - dull windows TCP Transfer - Spiceworks

Windows 10 Slow Download Fast Upload Ethernet

Windows ten, 10gbe connection wearisome transfer, DefaultSendWindow / tcp

Any resolution to this?

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