[lug] Samba, VPN, unison & speed

[Dan Ferris]

Have you tried setting the TCP Window size to adjust for the bandwidth 
delay product?

http://fasterdata.es.net/fasterdata/host-tuning/linux/

Dan

On 1/4/2012 8:50 AM, Ben Luey wrote:
> I'm running Debian Squeeze with Samba 3.5.6 and OpenVPN. It works fine,
> but using file sharing over the VPN is very slow. I've read that the smb
> protocol doesn't play nice with network latency, etc, so maybe there is
> nothing I can do about it, but I'm curious if anyone has any
> suggestions. Transferring large files utilizes at best 20% of bandwidth
> (direct wireless connetion to the vpn, or fast internet connection) (On
> wired 100MB/s ethernet without VPN, I get 50% utilization). Doing lots
> of dirs and small file look-ups are significantly slower. This is
> particularly a problem when using unison to sync diectories on a Windows
> machine (fastcheck is enabled in unison), which is really mostly what I
> care about.
>
> I've tried adding
> max protocol = SMB2 to samba, but speed tests under Win 7&  Ubuntu 11.10
> were the same. Maybe the solution is not to have unison run on top of
> windows file sharing, but users don't have shell/ssh access so I don't
> know how else to do it.
>
> Any ideas appreciated. Thanks,
>
> Ben
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