netdev - Re: bond + tc regression ?

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Message-Id: <200905051925.50142.denys@visp.net.lb>
Date:	Tue, 5 May 2009 19:25:50 +0300
From:	Denys Fedoryschenko <denys@...p.net.lb>
To:	Vladimir Ivashchenko <hazard@...ncoudi.com>
Cc:	netdev@...r.kernel.org
Subject: Re: bond + tc regression ?

Can you show example of rules you are putting?
Probably i can find mistakes and give correct example and i will explain maybe 
why it is happened.


On Tuesday 05 May 2009 18:45:58 Vladimir Ivashchenko wrote:
> Hi,
>
> I have a traffic policing setup running on Linux, serving about 800 mbps
> of traffic. Due to the traffic growth I decided to employ network
> interface bonding to scale over a single GigE.
>
> The Sun X4150 server has 2xIntel E5450 QuadCore CPUs and a total of four
> built-in e1000e interfaces, which I grouped into two bond interfaces.
>
> With kernel 2.6.23.1, everything works fine, but the system locked up
> after a few days.
>
> With kernel 2.6.28.7/2.6.29.1, I get 10-20% packet loss. I get packet loss
> as soon as I put a classful qdisc, even prio, without even having any
> classes or filters. TC prio statistics report lots of drops, around 10k per
> sec. With exactly the same setup on 2.6.23, the number of drops is only 50
> per sec.
>
> On both kernels, the system is running with at least 70% idle CPU.
> The network interrupts are distributed accross the cores.
>
> I thought it was a e1000e driver issue, but tweaking e1000e ring buffers
> didn't help. I tried using e1000 on 2.6.28 by adding necessary PCI IDs,
> I tried running on a different server with bnx cards, I tried disabling
> NO_HZ and HRTICK, but still I have the same problem.
>
> However, if I don't utilize bond, but just apply rules on normal ethX
> interfaces, there is no packet loss with 2.6.28/29.
>
> So, the problem appears only when I use 2.6.28/29 + bond + classful tc
> combination.
>
> Any ideas ?


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