netdev - Re: Two Dual Core processors and NICS (not handling interrupts on one CPU/assigning a Two Dual Core processors and NICS (not handling interrupts on one CPU / assigning a CPU to a NIC)

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Date:	Mon, 15 Jan 2007 11:58:12 +0200
From:	"Robert Iakobashvili" <coroberti@...il.com>
To:	"Mark Ryden" <markryde@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: Two Dual Core processors and NICS (not handling interrupts on one CPU/assigning a Two Dual Core processors and NICS (not handling interrupts on one CPU / assigning a CPU to a NIC)

Hi Mark,

On 1/15/07, Mark Ryden <markryde@...il.com> wrote:
> I have a machine with 2 dual core CPUs. This machine runs Fedora Core 6.
> I have two Intel e1000 GigaBit network cards on this machine; I use bonding so
> that the machine assigns the same IP address to both NICs ;

> cat /proc/interrupts shops something like this:
>                                 CPU0       CPU1         CPU2         CPU3
>  50:    3359337          0          0          0         PCI-MSI  eth0
>  58:         49    3396136          0          0         PCI-MSI  eth1
>
>  CPU0 and CPU1 are of the first CPU as far as I understand ; so
>  this means as far as I understand that the second CPU (which has CPU3
> and CPU4) does not handle
>  interrupts of the arrived packets; Can I somehow change it so the second
>  CPU will also handle network interrupts of receiving packets on the nic ?
>
> Can I assign one CPU to  eth0 and the second CPU to eth1  ?

How it will help you?
Y can set smp-affinity mask for each irq in /proc/<irq-number>/
google for 'linux smp-affinity".

The subject in more details is discussed in:
http://linux-net.osdl.org/index.php/TODO#TCP
and thread
http://marc.theaimsgroup.com/?t=116695290600001&r=1&w=2, read from
bottom.


-- 
Sincerely,
Robert Iakobashvili,
coroberti %x40 gmail %x2e com
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