netdev - Re: e1000 performance issue in 4 simultaneous links

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Date:	Fri, 11 Jan 2008 16:19:41 -0200
From:	Breno Leitao <leitao@...ux.vnet.ibm.com>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
	rick.jones2@...com, netdev@...r.kernel.org
Subject: Re: e1000 performance issue in 4 simultaneous links

On Fri, 2008-01-11 at 17:48 +0100, Eric Dumazet wrote:
> Breno Leitao a écrit :
> > Take a look at the interrupt table this time: 
> >
> > io-dolphins:~/leitao # cat /proc/interrupts  | grep eth[1]*[67]
> > 277:         15    1362450         13         14         13         14         15         18   XICS      Level     eth6
> > 278:         12         13    1348681         19         13         15         10         11   XICS      Level     eth7
> > 323:         11         18         17    1348426         18         11         11         13   XICS      Level     eth16
> > 324:         12         16         11         19    1402709         13         14         11   XICS      Level     eth17
> >
> >
> >   
> If your machine has 8 cpus, then your vmstat output shows a bottleneck :)
> 
> (100/8 = 12.5), so I guess one of your CPU is full

Well, if I run top while running the test, I see this load distributed
among the CPUs, mainly those that had a NIC IRC bonded. Take a look:

Tasks: 133 total,   2 running, 130 sleeping,   0 stopped,   1 zombie
Cpu0  :  0.3%us, 19.5%sy,  0.0%ni, 73.5%id,  0.0%wa,  0.0%hi,  0.0%si,  6.6%st
Cpu1  :  0.0%us,  0.0%sy,  0.0%ni, 75.1%id,  0.0%wa,  0.7%hi, 24.3%si,  0.0%st
Cpu2  :  0.0%us,  0.0%sy,  0.0%ni, 73.1%id,  0.0%wa,  0.7%hi, 26.2%si,  0.0%st
Cpu3  :  0.0%us,  0.0%sy,  0.0%ni, 76.1%id,  0.0%wa,  0.7%hi, 23.3%si,  0.0%st
Cpu4  :  0.0%us,  0.3%sy,  0.0%ni, 70.4%id,  0.7%wa,  0.3%hi, 28.2%si,  0.0%st
Cpu5  :  0.0%us,  0.0%sy,  0.0%ni,100.0%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Cpu6  :  0.0%us,  0.0%sy,  0.0%ni, 99.7%id,  0.0%wa,  0.0%hi,  0.3%si,  0.0%st
Cpu7  :  0.0%us,  0.0%sy,  0.0%ni,100.0%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st

Note that this average scenario doesn't change during the entire
benchmarking test.

Thanks!

-- 
Breno Leitao <leitao@...ux.vnet.ibm.com>

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