[lug] Samba, VPN, unison & speed

[Ben Luey]

> Have you tried setting the TCP Window size to adjust for the bandwidth
> delay product?
>
> http://fasterdata.es.net/fasterdata/host-tuning/linux/
No, I haven't tried it, but I'm connecting to the VPN with internet 
speeds of 1-5 Mbps, so my reading (see below) is that those 
optimizations would only degrade performance in that context. Also, I 
don't want to (significantly) degrade performance for people on the LAN.

"*Note that most of the tuning settings described here will actually 
decrease performance of hosts connected at rates of OC3 (155 Mbps) or 
less, such as home users on Cable/DSL connections.*"

Thanks for the suggestion though,

Ben


> 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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