TCP half of UDP

n4dsl · Thu Apr 12, 2007 2:27 pm

I have a P2P link setup with 2 933mhz Intel P3, using SR5 cards. Nstreme, 5ghzturbo, I am getting 62mbps UDP end to end, but I only get half on TCP, around 30mbps, any reason why?

I have them hooked together directly with 60db attenuators (no antennas), signals around -50

Another note, I am doing the test from windows Pc to windows Pc with btest.exe across the link. When I try and do a TCP test to the Mikrotik box (receive) it locks up the box? any reason why? If I do a send it is ok, but will only do around 30mbps?

I saw a post
http://forum.mikrotik.com/viewtopic.php ... th+tcp+udp
Where this person is getting around 60mbps with the same hardware I am using?

tgeorgiev · Thu Apr 12, 2007 3:55 pm

TCP has more overhead

TCP uses acknowledgment, retransmission. That is why

tgeorgiev · Thu Apr 12, 2007 3:56 pm

TCP has more overhead

TCP uses acknowledgment, retransmission. That is why

n4dsl · Thu Apr 12, 2007 5:01 pm

Ok, let me ask this, how come when I do a ftp download form Mikrotik box itself, I get 56mbps download? When I do ftp download from box behind mikrotik (ethernet) I only get half that?

taloot · Fri Apr 13, 2007 9:58 am

did you try v3b7?

check you ethernet that goes from router to the pc (behind MT)

make sure its not gigabit ( i got only 19mbps with some of them)

also access you motherbord bios and disable everythink that u dont need
(USB Audio printer interface anything that u dont need then try) locking up router happend 2 me twice 1 for the Irq and 2nd one for the realtek gigabit

n4dsl · Fri Apr 13, 2007 7:21 pm

Well I just upgraded to 3.0v7 same issue.

I am doing a routed 2 hop system,

MikrotikA 1 SR5
|
|
MikroTikB 2 SR5
|
|
Mikrotik C 1 SR5

if I go from a to b, I get 45 tcp via windows file sharing
a to c I get 35?
Is it normal to lose 10mbps via the middle hop? Should I do eoip or wds?

n4dsl · Tue Apr 17, 2007 1:57 pm

Anyone know if this is normal, I wouldn't think you should loose speed through a router like this?

taloot · Tue Apr 17, 2007 2:01 pm

are you testing from RB to RB

or from Windows (wirless link) windows?

jober · Wed Apr 18, 2007 3:08 pm

The WDS should be faster then the EoIP tunnel.
Any time you repeat you will lose speed. Try it with two RBs in the mid point and connect them with a switch or just a ethernet cable.
A............B_C................D
Route them if you can.

n4dsl · Thu Apr 19, 2007 1:38 pm

Yes I am testing from Windows to windows, throughput is better windows to mikrotik.

I have tried WDS bridged and standard routing, and the performance is very close. So I am losing about 5-10mbps going through a extra hop, why is it that I am losing throughput, when I am not actually repeating the signal on the same wireless interface. The mikrotik box in the middle has two wireless cards.

jober · Thu Apr 19, 2007 6:40 pm

What is the speed if you go from B to C?

chvdr · Sat Apr 21, 2007 5:29 pm

The WDS should be faster then the EoIP tunnel.
Any time you repeat you will lose speed. Try it with two RBs in the mid point and connect them with a switch or just a ethernet cable.
A............B_C................D
Route them if you can.

smells like "only p2p can give great performance", really?

regards, G. G.

Connor9220 · Mon Apr 23, 2007 7:23 am

What is your processor load on the AP's ?? (B_C might be overloaded)

TCP half of UDP

TCP half of UDP

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