From: jamal <hadi@cyberus•ca>
To: Robert Iakobashvili <coroberti@gmail•com>
Cc: Arjan van de Ven <arjan@infradead•org>, netdev@vger•kernel.org
Subject: Re: Network card IRQ balancing with Intel 5000 series chipsets
Date: Wed, 27 Dec 2006 09:31:19 -0500 [thread overview]
Message-ID: <1167229879.3807.24.camel@localhost> (raw)
In-Reply-To: <7e63f56c0612262309p5337a753q3b1748910fce70b5@mail.gmail.com>
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.
cheers,
jamal
[1] If you are able to change the NIC in your setup try looking at
netiron; email Leonid.Grossman@netiron•com they have a much clever nic
than the e1000. It has multiple DMA receive rings which are selectable
via a little classifier (example you could have RTP going to CPU0 and
rest going to CPU1). The DMA rings could be tied to different
interupts/MSI and with some little work could be made to appear like
several interfaces.
next prev parent reply other threads:[~2006-12-27 14:31 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-12-24 9:34 Network card IRQ balancing with Intel 5000 series chipsets Robert Iakobashvili
2006-12-25 9:35 ` Arjan van de Ven
2006-12-25 11:26 ` Robert Iakobashvili
2006-12-25 11:34 ` Arjan van de Ven
2006-12-25 12:54 ` Robert Iakobashvili
2006-12-26 18:44 ` jamal
2006-12-26 19:51 ` Robert Iakobashvili
2006-12-26 22:11 ` jamal
2007-01-02 17:56 ` Rick Jones
2006-12-26 22:06 ` Arjan van de Ven
2006-12-26 22:46 ` jamal
2006-12-27 0:28 ` Arjan van de Ven
2006-12-27 3:47 ` jamal
2006-12-27 7:09 ` Robert Iakobashvili
2006-12-27 14:31 ` jamal [this message]
2006-12-29 2:04 ` Krzysztof Oledzki
2006-12-29 17:36 ` Robert Iakobashvili
2006-12-27 13:08 ` Arjan van de Ven
2006-12-27 14:44 ` jamal
2006-12-27 15:06 ` Arjan van de Ven
2007-01-02 17:57 ` Rick Jones
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1167229879.3807.24.camel@localhost \
--to=hadi@cyberus$(echo .)ca \
--cc=arjan@infradead$(echo .)org \
--cc=coroberti@gmail$(echo .)com \
--cc=netdev@vger$(echo .)kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox