netdev - Re: e1000 performance issue in 4 simultaneous links

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Date:	Fri, 11 Jan 2008 16:45:47 -0200
From:	Breno Leitao <leitao@...ux.vnet.ibm.com>
To:	Denys Fedoryshchenko <denys@...p.net.lb>
Cc:	netdev@...r.kernel.org
Subject: Re: e1000 performance issue in 4 simultaneous links

Hello Denys, 
   I've installed sysstat (good tools!) and the result is very similar
to the one which appears at top, take a look:
   13:34:23     CPU   %user   %nice    %sys %iowait    %irq   %soft  %steal   %idle    intr/s
13:34:24     all    0.00    0.00    2.72    0.00    0.25   12.13    0.99   83.91  16267.33
13:34:24       0    0.00    0.00   21.78    0.00    0.00    0.00    7.92   70.30     40.59
13:34:24       1    0.00    0.00    0.00    0.00    0.99   24.75    0.00   74.26   4025.74
13:34:24       2    0.00    0.00    0.00    0.00    0.99   24.75    0.00   74.26   4036.63
13:34:24       3    0.00    0.00    0.00    0.00    0.99   21.78    0.00   77.23   4032.67
13:34:24       4    0.00    0.00    0.00    0.00    0.98   24.51    0.00   74.51   4034.65
13:34:24       5    0.00    0.00    0.00    0.00    0.00    0.00    0.00  100.00     30.69
13:34:24       6    0.00    0.00    0.00    0.00    0.00    0.00    0.00  100.00     33.66
13:34:24       7    0.00    0.00    0.00    0.00    0.00    0.00    0.00  100.00     32.67

So, we can assure that the IRQs are not being balanced, and that there
isn't any processor overload.

Thanks!


On Fri, 2008-01-11 at 19:36 +0200, Denys Fedoryshchenko wrote:
> Maybe good idea to use sysstat ?
> 
> http://perso.wanadoo.fr/sebastien.godard/

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