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Full Discussion: VPN performance problem
Homework and Emergencies Emergency UNIX and Linux Support VPN performance problem Post 302376043 by Corona688 on Monday 30th of November 2009 12:09:54 PM
Old 11-30-2009
VPN performance problem

This is a weird problem I've been butting my head against for days now...

I have two OpenVPN servers set up with identical configurations except for the keys. One of them is hosted in a datacenter with a large backbone, the other is hosted on my home server's limited residential internet. One of them delivers consistent topped-out performance(100 kilobytes per second) even while under network load, the other delivers at best 30 kilobytes per second when load-free. Care to guess which one is which?

You'd guess I'd get better performance on the VPS, right? Wrong! My anemic home server gets better performance and throughput than my hosting provider. This is made doubly odd by the fact that throughput to my hosting provider seems fine in any other way I've thought to test. CPU load, I/O load, network load, all of those look minimal.

They're running nearly identical systems, with the same OS(Gentoo Linux) and very similar versions of OpenVPN -- indeed, their specific support for Gentoo and OpenVPN both are reasons this provider was picked. No firewalls or bandwidth throttling is involved yet. The latency to both hosts is nearly identical(i.e. terrible Smilie But my client's behind a sat connection, so it's to be expected ) I'm nearly out of ideas. Is it time to fire my hosting provider? Any suggestions for alternatives?

Last edited by Corona688; 11-30-2009 at 01:16 PM..
 

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dtest(1)							   USER COMMANDS							  dtest(1)

NAME
dtest - simple uDAPL send/receive and RDMA test SYNOPSIS
dtest [-P provider] [-b buf size] [-B burst count][-v] [-c] [-p] [-d] [-s] dtest [-P provider] [-b buf size] [-B burst count][-v] [-c] [-p] [-d] [-h HOSTNAME] DESCRIPTION
dtest is a simple test used to exercise and verify the uDAPL interfaces. At least two instantiations of the test must be run. One acts as the server and the other the client. The server side of the test, once invoked listens for connection requests, until timing out or killed. Upon receipt of a cd connection request, the connection is established, the server and client sides exchange information necessary to per- form RDMA writes and reads. OPTIONS
-P=PROVIDER use PROVIDER to specify uDAPL interface using /etc/dat.conf (default OpenIB-cma) -b=BUFFER_SIZE use buffer size BUFFER_SIZE for RDMA(default 64) -B=BURST_COUNT use busrt count BURST_COUNT for interations (default 10) -v, verbose output(default off) -c, use consumer notification events (default off) -p, use polling (default wait for event) -d, delay in seconds before close (default off) -s, run as server (default - run as server) -h=HOSTNAME use HOSTNAME to specify server hostname or IP address (default - none) EXAMPLES
dtest -P OpenIB-cma -v -s Starts a server process with debug verbosity using provider OpenIB-cma. dtest -P OpenIB-cma -h server1-ib0 Starts a client process, using OpenIB-cma provider to connect to hostname server1-ib0. SEE ALSO
dapltest(1) AUTHORS
Arlin Davis <ardavis@ichips.intel.com> BUGS
uDAPL 1.2 February 23, 2007 dtest(1)
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