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From: Vladimir Ivashchenko <hazard@francoudi.com>
To: Denys Fedoryschenko <denys@visp.net.lb>
Cc: netdev@vger.kernel.org
Subject: Re: bond + tc regression ?
Date: Wed, 6 May 2009 23:47:59 +0300	[thread overview]
Message-ID: <20090506204759.GA16681@francoudi.com> (raw)
In-Reply-To: <200905062230.04594.denys@visp.net.lb>

On Wed, May 06, 2009 at 10:30:04PM +0300, Denys Fedoryschenko wrote:

> > What's interesting, the same 850mbps load, identical machine, but with
> > only two NICs and no bond, HTB+esfq, kernel 2.6.21.2 => 60% CPU idle.
> > 2.5x overhead.
> 
> Probably oprofile can sched some light on this.
> On my own experience IRQ balancing hurt performance a lot, because of cache 
> misses.

This is a dual-core machine, isn't cache shared between the cores?

Without IRQ balancing, one of the cores goes around 10% idle and HTB doesn't do
its job properly. Actually, in my experience HTB stops working properly after
idle goes below 35%.

I'll try gathering some stats using oprofile.

-- 
Best Regards
Vladimir Ivashchenko
Chief Technology Officer
PrimeTel, Cyprus - www.prime-tel.com

  reply	other threads:[~2009-05-06 20:48 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-05-05 15:45 bond + tc regression ? Vladimir Ivashchenko
2009-05-05 16:25 ` Denys Fedoryschenko
2009-05-05 16:31 ` Eric Dumazet
2009-05-05 17:41   ` Vladimir Ivashchenko
2009-05-05 18:50     ` Eric Dumazet
2009-05-05 23:50       ` Vladimir Ivashchenko
2009-05-05 23:52         ` Stephen Hemminger
2009-05-06  3:36         ` Eric Dumazet
2009-05-06 10:28           ` Vladimir Ivashchenko
2009-05-06 10:41             ` Eric Dumazet
2009-05-06 10:49               ` Denys Fedoryschenko
2009-05-06 18:45           ` Vladimir Ivashchenko
2009-05-06 19:30             ` Denys Fedoryschenko
2009-05-06 20:47               ` Vladimir Ivashchenko [this message]
2009-05-06 21:46                 ` Denys Fedoryschenko
2009-05-08 20:46                   ` Vladimir Ivashchenko
2009-05-08 21:05                     ` Denys Fedoryschenko
2009-05-08 22:07                       ` Vladimir Ivashchenko
2009-05-08 22:42                         ` Denys Fedoryschenko
2009-05-17 18:46                           ` Vladimir Ivashchenko
2009-05-18  8:51                             ` Jarek Poplawski
2009-05-06  8:03       ` Ingo Molnar
2009-05-06  6:10     ` Jarek Poplawski
2009-05-06 10:36       ` Vladimir Ivashchenko
2009-05-06 10:48         ` Jarek Poplawski
2009-05-06 13:11           ` Vladimir Ivashchenko
2009-05-06 13:31             ` Patrick McHardy

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