[Samba] degraded performance under domain login load

Tue Apr 4 17:28:32 GMT 2006

I had a similar problem to this, but as an add bonus my client stations will
also drop connection. We found the problem to be hardware related and not
Software. We test the software and found it to perform just fine in normal
conditions, so we started to test hardware, hardware being switch, network
cards etc... We started with network cards. It preformed the same then we
started to replace our networked switch with smaller 4 port switch just to
test the performance and AHAA that was the problem. The switch was failing.
Of course it was an unmanaged switch so we just replaced. 

Hope this helps
Mark

-----Original Message-----
From: samba-bounces+mes4294=lausd.k12.ca.us at lists.samba.org
[mailto:samba-bounces+mes4294=lausd.k12.ca.us at lists.samba.org] On Behalf Of
Chris Anders
Sent: Tuesday, April 04, 2006 6:11 AM
To: samba at lists.samba.org
Subject: Re: [Samba] degraded performance under domain login load

Sorry guys i failed to mention that under a normal load where only a  
few people would login at the one time, there was no sign of degraded  
performance however when everyone tried to login at once thats when  
these results occurred.. so for now people will login 3 machines at a  
time which is obviously not acceptable.

Kind Regards,

Chris Anders
Network Engineer

Anders Networks
Mobile     - 0421 580 017
Email       - chris at anders.net.au
Web         - http://www.anders.net.au

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On 04/04/2006, at 10:20 PM, Chris Anders wrote:

> Hi guys,
>
> Not sure how to diagnose this problem however i have recently  
> upgraded one of my schools sites from gentoo to freebsd which moved  
> us from samba 3.0.14 to 3.0.21b and the first thing I noticed was  
> when the students came to login if they all logged in at once the  
> performance of login was crippled to a near standstill!
>
> As a test i swapped in the gentoo box and forced the upgrade to  
> samba 3.0.21b (incase it was distro related) and to my surprise the  
> same problem occurred, a class will come into the computer lab all  
> try to login, kixtart will start do its login procedures and  
> everything would login at a snail pace, to the point kixtart will  
> lockup and generate errors!!!
>
> As the next test, i swaped the fresh installed freebsd system back  
> in removed the latest samba from ports and manually installed samba  
> 3.0.14 and the problem was resolved. This leads me to believe that  
> this is not distro specific at all, however a serious problem in  
> high load systems of login.
>
> Is there is a way to tune the latest versions of samba to combat  
> this problem as i even noticed loading some apps off the network,  
> if everyone is trying to access the same app at the same time that  
> it too will loads at a snail pace...
>
> I have monitored server load and smbd usage and nothing looks out  
> of the ordinary, i have watched logs with nothing standing out as a  
> problem...
>
> This computer lab only consists of 25 computers and the server is a  
> dual xeon with a 3ware card running raid5 using raptors, so it has  
> plenty of IO!
> The workstation OS is win2k w/sp4
>
> Any ideas ?
>
>
>
> Kind Regards,
>
>
> Chris Anders
> Network Engineer
>
> Anders Networks
> Mobile     - 0421 580 017
> Email       - chris at anders.net.au
> Web         - http://www.anders.net.au
>
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