netdev - Re: Network card IRQ balancing with Intel 5000 series chipsets

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Message-ID: <7e63f56c0612290936n25186dc1sd96f32bacbb5a674@mail.gmail.com>
Date:	Fri, 29 Dec 2006 19:36:19 +0200
From:	"Robert Iakobashvili" <coroberti@...il.com>
To:	"Krzysztof Oledzki" <olel@....pl>
Cc:	jamal <hadi@...erus.ca>, "Arjan van de Ven" <arjan@...radead.org>,
	netdev@...r.kernel.org
Subject: Re: Network card IRQ balancing with Intel 5000 series chipsets

Hi Krzysztof,

On 12/29/06, Krzysztof Oledzki <olel@....pl> wrote:
>
>
> On Wed, 27 Dec 2006, jamal wrote:
>
> > On Wed, 2006-27-12 at 09:09 +0200, Robert Iakobashvili wrote:
> >
> >>
> >> My scenario is treatment of RTP packets in kernel space with a single network
> >> card (both Rx and Tx). The default of the Intel 5000 series chipset is
> >> affinity of each
> >> network card to a certain CPU. Currently, neither with irqbalance nor
> >> with kernel
> >> irq-balancing (MSI and io-apic attempted) I do not find a way to
> >> balance that irq.
> >
> > In the near future, when the NIC vendors wake up[1] because CPU vendors
> > - including big bad Intel -  are going to be putting out a large number
> > of hardware threads, you should be able to do more clever things with
> > such a setup. At the moment, just tie it to a single CPU and have your
> > other processes that are related running/bound on the other cores so you
> > can utilize them. OTOH, you say you are only using 30% of the one CPU,
> > so it may not be a big deal to tie your single nic to on cpu.
>
> Anyway, it seems that with more advanced firewalls/routers kernel spends
> most of a time in IPSec/crypto code, netfilter conntrack and iptables
> rules/extensions, routing lookups, etc and not in hardware IRQ handler.
> So, it would be nice if this part coulde done by all CPUs.


Do you mean, that it should be an option to configure BH soft-irq handling
to make packet processing balanced among several CPUs?
There is an issue of packet order, isn't it?


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