Re: bond + tc regression ?

[Vladimir Ivashchenko]

I have just confirmed that with 2.6.29.1 I'm getting the same problem as
with 2.6.28.

On Sat, 2009-04-18 at 22:15 +0300, 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, 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 approximately 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 2.6.28.7.
> 
> So, the problem appears only when I use 2.6.28.7 + bond + tc
> combination.
> 
> Any ideas ?
> 
-- 
Best Regards,
Vladimir Ivashchenko
Chief Technology Officer
PrimeTel PLC, Cyprus - www.prime-tel.com
Tel: +357 25 100100 Fax: +357 2210 2211


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