netdev.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: jamal <hadi@cyberus.ca>
To: John Ye <johny@asimco.com.cn>
Cc: Stephen Hemminger <shemminger@linux-foundation.org>,
	David Miller <davem@davemloft.net>,
	netdev@vger.kernel.org, kuznet@ms2.inr.ac.ru, pekkas@netcore.fi,
	jmorris@namei.org, kaber@coreworks.de, iceburgue@gmail.com
Subject: Re: [PATCH: 2.6.13-15-SMP 3/3] network: concurrentlyrunsoftirqnetwork code on SMP
Date: Wed, 26 Sep 2007 09:26:37 -0400	[thread overview]
Message-ID: <1190813197.4257.17.camel@localhost> (raw)
In-Reply-To: <004d01c7ffe2$b73fec20$ca8510ac@asimco>

On Wed, 2007-26-09 at 10:12 +0800, John Ye wrote:

> cpu hash (srcip + dstip) % nr_cpus, plus checking cpu balance periodically,
> shift cpu by an extra seed value?

That may work maybe even add ipproto as a 3rd tuple; experiments will
tell - you need to be able to generate a random enough traffic pattern.
For example if the traffic pattern is always for your local host the
dstip may not be useful to the hash. 
You could always try the hash tests outside first; look at some of the
jenkins hashes in the kernel

> __do_IRQ has a tendency to collect same IRQ on different CPUs into one CPU
> when NIC is busy(by IRQ_PENDING & IRQ_INPROGRESS control skill). so,
> dispatch the load to SMP here may be good thing(?).

possibly. Or you may wanna tie the NIC IRQ to a CPU. 

cheers,
jamal



      reply	other threads:[~2007-09-26 13:26 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <004901c7fd9c$94370df0$d6ddfea9@JOHNYE1>
2007-09-23 12:43 ` [PATCH: 2.6.13-15-SMP 3/3] network: concurrently run softirqnetwork code on SMP jamal
2007-09-23 15:45   ` [PATCH: 2.6.13-15-SMP 3/3] network: concurrently runsoftirqnetwork " john ye
2007-09-23 18:07     ` jamal
2007-09-24  3:48       ` [PATCH: 2.6.13-15-SMP 3/3] network: concurrentlyrunsoftirqnetwork " John Ye
2007-09-25 15:36   ` [PATCH: 2.6.13-15-SMP 3/3] network: concurrently runsoftirqnetwork " john ye
2007-09-25 16:03     ` Stephen Hemminger
2007-09-25 22:22       ` jamal
2007-09-26  2:12         ` [PATCH: 2.6.13-15-SMP 3/3] network: concurrentlyrunsoftirqnetwork " John Ye
2007-09-26 13:26           ` jamal [this message]

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=1190813197.4257.17.camel@localhost \
    --to=hadi@cyberus.ca \
    --cc=davem@davemloft.net \
    --cc=iceburgue@gmail.com \
    --cc=jmorris@namei.org \
    --cc=johny@asimco.com.cn \
    --cc=kaber@coreworks.de \
    --cc=kuznet@ms2.inr.ac.ru \
    --cc=netdev@vger.kernel.org \
    --cc=pekkas@netcore.fi \
    --cc=shemminger@linux-foundation.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
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;
as well as URLs for NNTP newsgroup(s).