Re: Slow file sharing performance

I don't have tcpdump installed, but I do have Ethereal and already have 
most of what you want in that format.  Would that help?


Allan Latham wrote:
> Hi James
> 
> the following would be useful if that doesn't cause you privacy problems:
> 
> all covering the same timespan during the problem.
> 
> on the laptop:
> 
> tcpdump -i ppp0 (or whatever) -v -n > laptop_ppp0
> tcpdump -i cipcb0 (or whatever) -v -n  > laptop_cipcb0
> 
> on the router:
> 
> tcpdump -i eth0 (your cable modem) -v -n > router_eth0
> tcpdump -i eth1 (your local net) -v -n > router_eth1
> tcpdump -i cipcb0 (or whatever) -v -n > router_cipcb0
> 
> on the file server:
> 
> tcpdump -i eth0 (or whatever) -v -n > server_eth0
> 
> then send me the 6 logfiles. You may want to send direct to me rather than the 
> group.
> 
> Best regards
> 
> Allan
> 
> 
> On Wednesday 03 September 2003 03:30, James Knott wrote:
> 
>>I have tried reducing txqueuelen to 3.  First on the NIC in the desktop
>>system and then both ends of the VPN.  Neither had any noticable effect
>>on the problem.
>>
>>Allan Latham wrote:
>>
>>>Hi James
>>>
>>>try the effect of reducing the transmit queues on the file server and
>>>router. This is not likely to be a satisfactory long term solution but
>>>may get you nearer to the source of the problem.
>>>
>>>Try 100 -> 30 -> 10 -> 3 and note the performance differences. (ifconfig
>>>lets you change the queue). You may want to reduce the queue length on
>>>the cipe device too.
>>>
>>>If this makes a significant difference then you will probably need some
>>>form of bandwidth control on the file server - we'll look at that if this
>>>is in fact the problem.
>>>
>>>Best regards
>>>
>>>Allan
>>>
>>>On Tuesday 02 September 2003 01:21, James Knott wrote:
>>>
>>>>Allan Latham wrote:
>>>>
>>>>>Hi all
>>>>>
>>>>>this has generated a lot of replies. It may make it easier if we could
>>>>>all see a more precise statement of the problem:
>>>>>
>>>>>What exactly are you running - hardware, OS and cipe versions at both
>>>>>ends? What are the respective performances for both small and large
>>>>>files (in each direction)?
>>>>
>>>>Main desktop system: Athlon XP 1700+
>>>>Firewall: 166 MHz Pentium
>>>>Notebook:  1.113 GHz PIII
>>>>
>>>>Red Hat 7.3 on all systems, with CIPE cipe-1.4.5-9 on both ends of the
>>>>VPN
>>>>
>>>>Wben accessing the notebook from the home lan, performance is as may be
>>>>expected from a dial up connection for all protocols.  When accessing
>>>>the home network from the notebook, everything works fine, except SMB &
>>>>NFS.  For example, ftp works OK.  I haven't made any performance
>>>>measurements.  However Ethereal shows SMB transfers stop after about 12
>>>>packet exchanges.  If I wait an extremely long time, I may see something
>>>>show up, but not much.
>>>>
>>>>
>>>>>Are directory searches slow or just file transfers?
>>>>
>>>>Both.
>>>>
>>>>
>>>>>If your OS supports pings of various lengths what does this show (in
>>>>>each direction)?
>>>>
>>>>I haven't tried different length pings, however other traffic, such as
>>>>telnet, ftp, ssh etc. have no problems.  I have also tried adjusting MTU
>>>>on both the VPN and end systems.  Ping times through the firewall are
>>>>slightly longer than those without.
>>>>
>>>>
>>>>>What are the firewall rules on all machines you have control of
>>>>>(notebook, cable modem (if applicable), home router, file server)?
>>>>>What NFS sofware are you using - is it TCP or UDP based?
>>>>
>>>>There are no firewall rules currently running on the notebook.  The VPN
>>>>traffic doesn't pass through any firewall rules, though the ethernet
>>>>port to the cable modem is filtered and configured to pass the
>>>>appropriate UDP ports.  I'm using the NFS that came with Red Hat, which
>>>>I believe is UDP.  The firewall rules were posted in another message.
>>>>
>>>>
>>>>>One last point not raised so far - what are your transmit queue lengths
>>>>>on the file server and the home router. Ifconfig gives you these.
>>>>
>>>>All are 100.
>>>>
>>>>
>>>>>Please excuse me if some of this is already available in the current
>>>>>thread but it would be good to get it one place.
>>>>>
>>>>>I feel that this will go some way to helping everyone on the list get a
>>>>>clearer picture - and hopefully an answer.
>>>>>
>>>>>Best regards
>>>>>
>>>>>Allan
>>>>>
>>>>>On Sunday 31 August 2003 04:39, James Knott wrote:
>>>>>
>>>>>>I've notice that while my CIPE VPN works, that SMB and NFS access of my
>>>>>>home network from my notebook is slow.  However, going the other way,
>>>>>>accessing file shares on my notebook, from my home lan is fine.  I'm
>>>>>>connecting from my notebook, via dialup ISP and cable modem to my home
>>>>>>network.
>>>>>>
>>>>>>Why is this problem in only one direction?  Is it due to the speed
>>>>>>difference between my home network and dial up modem?
>>>>>>
>>>>>>Any ideas?
>>>>>>
>>>>>>tnx jk
>>>>>
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>>>
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> 
> 
> 



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