Hi, On Thu, May 19, 2016 at 01:48:41PM +0200, Ralf Hildebrandt wrote: > I found this > https://www.lowendtalk.com/discussion/40099/why-openvpn-is-so-slow-cool-story > > Is setting sndbuf/rcvbuf really a good solution?
To be honest, we don't *know*... testing results are inconclusive.
Part of the issue are certainly buffers (if packets coming in from tun/tap
cannot be sendmsg()'ed out due to too-small buffers), part is the extra
delay added by OpenVPN (userland<->kernel, crypto, ...) which plays into
"RTT*bandwidth > window size", and some part seems to be "windows"...
Jan-Just Keiser has done some measurements, Valdikss has, I have, and
the results usually pointed to "we measured something totally different".
"too-small" buffers are certainly not good, which is why we've changed
the defaults a few months ago - the old code tried to *increase* the
buffer size, but on current operating systems actually *decreased* it...
gert
--
USENET is *not* the non-clickable part of WWW!
//www.muc.de/~gert/
Gert Doering - Munich, Germany g...@greenie.muc.de
fax: +49-89-35655025 g...@net.informatik.tu-muenchen.de
signature.asc
Description: PGP signature
------------------------------------------------------------------------------ Mobile security can be enabling, not merely restricting. Employees who bring their own devices (BYOD) to work are irked by the imposition of MDM restrictions. Mobile Device Manager Plus allows you to control only the apps on BYO-devices by containerizing them, leaving personal data untouched! https://ad.doubleclick.net/ddm/clk/304595813;131938128;j
_______________________________________________ Openvpn-users mailing list Openvpn-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/openvpn-users
