Low LAN throughput

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orif
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Joined: 03 Oct 2018
Posts: 52

PostPosted: Wed Jul 01, 2020 8:02    Post subject: Low LAN throughput Reply with quote
I have an old TP-Link 841 (2018 DD-WRT firmware) which was utilizing a 50 Mbps connection just fine (35-40 Mbps wireless and 50 Mbps LAN). When I put the router on a 100 Mbps connection, the wireless speed remained the same but what amused me was that when I plug a LAN cable from the router directly to my laptop, the speed is no more than 65 Mbps.

Can the cause of this quite low LAN cable speed be the age of the router or rather some DD-WRT settings? Will changing some settings or flashing latest DD-WRT firmware help?
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egc
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Joined: 18 Mar 2014
Posts: 7532
Location: Netherlands

PostPosted: Wed Jul 01, 2020 8:34    Post subject: Reply with quote
There are numerous versions from that router from slow to very slow, you have to be a bit more specific also about the used build.
We can help better if you follow the forum guidelines ( https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=324087 )

In general enabling Shortcut Forwarding Engine (SFE) on Setup page gives you the best possible throughput.

I do not have this router but if you have the higher clocked versions then I would think that speeds approaching 100 Mb/s would be possible.
Of course your router has !00Mb/s ports so that is the max.

Maybe it is time to upgrade Smile

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Forum Guide Lines (important read):https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=324087
orif
DD-WRT User


Joined: 03 Oct 2018
Posts: 52

PostPosted: Wed Jul 01, 2020 8:41    Post subject: Reply with quote
Build 36527. Is there some stable more recent release to try? SFE is enabled :)
dasnick
DD-WRT User


Joined: 23 Jul 2009
Posts: 69

PostPosted: Wed Jul 01, 2020 8:49    Post subject: Reply with quote
check here https://download1.dd-wrt.com/dd-wrtv2/downloads/betas/2020/06-25-2020-r43516/
orif
DD-WRT User


Joined: 03 Oct 2018
Posts: 52

PostPosted: Wed Jul 01, 2020 11:21    Post subject: Reply with quote
Thank you but as far as I can see this is the very last release. Is there any earlier but proven stable build?
egc
DD-WRT Guru


Joined: 18 Mar 2014
Posts: 7532
Location: Netherlands

PostPosted: Wed Jul 01, 2020 11:30    Post subject: Reply with quote
orif wrote:
Thank you but as far as I can see this is the very last release. Is there any earlier but proven stable build?


Perhaps read the forum guidelines

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Routers:Netgear R7800, R6400v1, R6400v2, Linksys EA8500, EA6900 (XvortexCFE), E2000 (converted WRT320N), WRT54GS v1.
WireGuard Documents & Guides:https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=327397
OpenVPN Documents & Guides: https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=327398
IPSET: https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=327261
Install guide R6400v2:http://forum.dd-wrt.com/phpBB2/viewtopic.php?t=316399
Install guide R7800: https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=320614
Forum Guide Lines (important read):https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=324087
Alozaros
DD-WRT Guru


Joined: 16 Nov 2015
Posts: 4291
Location: UK, London, just across the river..

PostPosted: Wed Jul 01, 2020 13:15    Post subject: Re: Low LAN throughput Reply with quote
orif wrote:
I have an old TP-Link 841 (2018 DD-WRT firmware) which was utilizing a 50 Mbps connection just fine (35-40 Mbps wireless and 50 Mbps LAN). When I put the router on a 100 Mbps connection, the wireless speed remained the same but what amused me was that when I plug a LAN cable from the router directly to my laptop, the speed is no more than 65 Mbps.

Can the cause of this quite low LAN cable speed be the age of the router or rather some DD-WRT settings? Will changing some settings or flashing latest DD-WRT firmware help?


smells like its a time for a new router...
that buddy you have (we don't know witch version is it), does not have a specs, slow CPU less RAM, small flash size ram, those poor specs make it only suitable for a basic needs on slow old school connections....or use it as a WAP...
to utilise a bett speed you'd need powerful router something like R6400, R7000 or R7800...look for second hand offers, too many of them on the market...

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Atheros
TP-Link WR740Nv1 -----DD-WRT 46446 BS AP,NAT
TP-Link WR740Nv4 -----DD-WRT 44251 BS WAP/Switch
TP-Link WR1043NDv2 ---DD-WRT 46446 BS AP,NAT,AP Isolation,Ad-Block,Firewall,Local DNS,Forced DNS,DoT,VPN,VLAN
TP-Link WR1043NDv2 ---DD-WRT 46446 BS AP,NAT,AD/Block,Firewall,Local DNS,Forced DNS,DoT,VPN,VLAN
TP-Link WR1043NDv2 ---Gargoyle OS 1.12.0 AP,NAT,QoS,Quotas
Qualcomm/IPQ8065
Netgear R7800 -----DD-WRT 46446 BS AP,NAT,AD-Block,AP&Net Isolation,VLAN's,Firewall,Local DNS,DoT
Broadcom
Netgear R7000 -----DD-WRT 46446 BS AP,Wi-Fi OFF,NAT,AD-Block,Firewall,Local DNS,Forced DNS,VLAN's,DoT,VPN
-----------------------------------------------------------------------------------------------
Stubby for DNS over TLS I DNSCrypt v2 by mac913
kernel-panic69
DD-WRT Guru


Joined: 08 May 2018
Posts: 8556
Location: Texas, USA

PostPosted: Wed Jul 01, 2020 13:48    Post subject: Reply with quote
Looks like all of the TL-WR841N series that are Atheros are either 400, 535, 550, or 650 MHz cpu with 4MB flash and 32MB ram. The v13 and v14 are MediaTek @ 575, and the v13 has 8MB flash and 64MB ram. The 74* series are anemic. The v3+ of the 940 series and v6 of the 941 series have good specs, but. The v2+ 1043 series has a little more horsepower. Hoping to have a second v5 soon to see what the issue is with flashing it. OpenWRT didn't have a page for the 840 series to link Rolling Eyes

https://openwrt.org/toh/tp-link/tl-wr841nd

https://openwrt.org/toh/tp-link/tl-wr741nd

https://openwrt.org/toh/tp-link/tl-wr740n

https://openwrt.org/toh/tp-link/tl-wr940n

https://openwrt.org/toh/tp-link/tl-wr941nd

https://openwrt.org/toh/tp-link/tl-wr1043nd

The models with 720+MHz cpu aren't completely useless, but depends on what you want to do in the future.

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