Why OpenVPN is so slow? (cool story)

wilwil

Hi,
It's really very useful discussion. And your fix really helped me. With OpenVPN I used to have down: 5Mbs/s- up:5Mbits/s (my original connexion 20Mbits up and down). But after the fix both up and down are fixed but :
-For Download : I get nearly the original speed connexion (17-18-19 Mbits/s)
-But for Upload: I always have difference of (3-5Mbits/s) in each test I did.

Have you an Idea about this ??? And thanks
(Knowing that I work with TCP protocol, Tun interface & The server is on Linux machine but clients are windows8 machines).

Nomad

So, today in IRC I've been told that in the next release they'll be implementing sndbuf 0 and rcvbuf 0 values as default.

I love necromancy btw.

ValdikSS

@Nomad said:
So, today in IRC I've been told that in the next release they'll be implementing sndbuf 0 and rcvbuf 0 values as default.

I love necromancy btw.

That's true, it would be included in 2.3.9 with other cool speed fixes.

bashed

would be faster if it support more than 1 thread / 1+ cpu cores. Waiting on openvpn 3, seems like they been working on this for some time, years?

ZEROF

Great tip @ValdikSS, got almost full home internet speed. And i have dns cache server with dnsmasq (set on BeagleBone), now all goes very fast on my side.

ValdikSS

@ZEROF great! We'll release 2.3.9 this Monday with this fix enabled by default.

ZEROF

DNS cache (dnsmasq) + OpenVPN give me dig query time 7msec and ping 20,9 ms (over wifi connection, not cable). That is fine for me . I don't know when Debian will push new version to their repository (now 2.3.4), i will stick with this settings for now.

AxiomCS

I know this is an old discussion. Just wanted to say thanks for the info. It saved me a headache I was having.

blackhiden

Awesome article.
Rn, I'm actively learning about this protocol.

One question sir.
You said:

@ValdikSS said: That means that if you're connecting to other VPN site over long fat link, i.e. USA to Russia with ping about 100 ms, you can't get speed more than 5.12 Mbit/s with default OpenVPN buffer settings

In my next experiment I will try this, but in local environment (2 vm's with private addresses) which has less than 1ms ping.
So, will this configuration work?

chocolateshirt

Neecroooo

ErawanArifNugroho

Necromancer

TimboJones

@blackhiden said:
Awesome article.
Rn, I'm actively learning about this protocol.

One question sir.
You said:

@ValdikSS said: That means that if you're connecting to other VPN site over long fat link, i.e. USA to Russia with ping about 100 ms, you can't get speed more than 5.12 Mbit/s with default OpenVPN buffer settings

In my next experiment I will try this, but in local environment (2 vm's with private addresses) which has less than 1ms ping.
So, will this configuration work?

Check back in six years for the reply.

henix

Holy necro

default

blackhiden

well, better late than nothing.

jmgcaguicla

@blackhiden said:
well, better late than nothing.

Just open a new thread, this has been necro'd 2 times by now

ValdikSS

@blackhiden said:
In my next experiment I will try this, but in local environment (2 vm's with private addresses) which has less than 1ms ping.
So, will this configuration work?

You don't need to adjust buffer sizes anymore on new OpenVPN versions. This issue has been fixed for several years.

ValdikSS

@TimboJones said:
Check back in six years for the reply.

Lowendtalk sends email notifications for your topics, just like any proper forum.

TimboJones

@ValdikSS said:

@TimboJones said:
Check back in six years for the reply.

Lowendtalk sends email notifications for your topics, just like any proper forum.

whoosh

Thanks Captain Obvious.