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Re: [Openvpn-users] Performance Bottleneck

  • Subject: Re: [Openvpn-users] Performance Bottleneck
  • From: Les Mikesell <lesmikesell@xxxxxxxxx>
  • Date: Wed, 18 Jul 2007 10:38:13 -0500

Henric Rosvall wrote:
> As expected, doubled memory didn't make any difference. And even though 
> 512 MB isn't much, about 300 MB free memory should definately be enough 
> (and don't laugh, 256 MB spare 333 Mhz DDR-memory isn't the easiest 
> thing to get hold of these days  :P )
> So now I'm /really/ at a loss. I've done everything I can think of. 
> Tried three different versions of OpenVPN in WIndows, including the 
> RC4-build (which worked wonderfully on my Vista-machine), changed NIC, 
> doubled the memory, and tried both Windows 2003 Server and Ubuntu 7.04 
> (with VERY similar results). But no matter what I do, transfers remain 
> at a level much lower than what it should be - which destroys the 
> purpose of the backup-transfer-machine, since it won't be able to 
> transfer the backup completely before a new set of backups are supposed 
> to be downloaded...
> So any ideas on how to increase the performance would be grealy 
> appreciated. Somehow I don't think installing Vista on the old machine 
> will make the speed increase dispite the new TCP/IP-stack included in 
> that OS :/
> BTW: Wouldn't it be a good idea to make the virtual network-driver for 
> windows a 10/100-driver instead of just a 10 MBit-driver? Cause on my 
> Vista-machine, it seems like it's the 10 MBit of the virtual driver that 
> makes it unable to transfer more than approximately 1 MB/s since it's 
> constantly maxed out at 99-100%.

Are you using blowfish as the encryption method?  What about lzo 
compression - it may or may not help so try it both ways.  This sounds 
like it might be an MTU problem where the routers are fragmenting the 
packets carrying the tunnel, but I've forgotten the fix for it.
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