netdev - Re: e1000 performance issue in 4 simultaneous links

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Message-ID: <47A0AC89.6080806@intel.com>
Date:	Wed, 30 Jan 2008 08:57:45 -0800
From:	"Kok, Auke" <auke-jan.h.kok@...el.com>
To:	Denys Fedoryshchenko <denys@...p.net.lb>
CC:	David Miller <davem@...emloft.net>, benny+usenet@...rsen.dk,
	netdev@...r.kernel.org
Subject: Re: e1000 performance issue in 4 simultaneous links

Denys Fedoryshchenko wrote:
> Sorry. that i interfere in this subject.
> 
> Do you recommend CONFIG_IRQBALANCE to be enabled?

I certainly do not. Manual tweaking and pinning the irq's to the correct CPU will
give the best performance (for specific loads).

The userspace irqbalance daemon tries very hard to approximate this behaviour and
is what I recommend for most situations, it usually does the right thing and does
so without making your head spin (just start it).

The in-kernel one usually does the wrong thing for network loads.

Cheers,

Auke
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