From: Eric Dumazet <eric.dumazet@gmail.com>
To: Tom Herbert <therbert@google.com>
Cc: Alexander Duyck <alexander.h.duyck@intel.com>,
Brattain <ross.b.brattain@intel.com>,
Jeff Kirsher <jeffrey.t.kirsher@intel.com>,
netdev <netdev@vger.kernel.org>
Subject: Re: [RFC] ixgbe: is DCA really that good ?
Date: Wed, 06 Apr 2011 18:14:22 +0200 [thread overview]
Message-ID: <1302106462.3209.111.camel@edumazet-laptop> (raw)
In-Reply-To: <BANLkTimSRhuVTcOX-EHx74_y3pnDdCRi8A@mail.gmail.com>
Le mercredi 06 avril 2011 à 08:24 -0700, Tom Herbert a écrit :
> On Wed, Apr 6, 2011 at 6:44 AM, Eric Dumazet <eric.dumazet@gmail.com> wrote:
> > Hi guys
> >
> >
> > In a forwarding [or RPS/RFS] setup, why should we populate cpu caches
> > with full frames content ? We only need first cache line to perform
> > routing [or RPS/RFS] decision.
> >
> DCA + accelerated RFS might make good. But I agree that it should be
> configurable.
An IRQ affinity mismatch is fatal with dca-core current code, because
dca3_get_tag() ->
dca_common_get_tag() ->
spin_lock_irqsave(&dca_lock, flags);
Wei Gu hit this on a 64 cpus machine (but only 8 cpus servicing ixgbe
interrupts), and finding the problem took lot of time.
next prev parent reply other threads:[~2011-04-06 16:14 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-06 13:44 [RFC] ixgbe: is DCA really that good ? Eric Dumazet
2011-04-06 15:24 ` Tom Herbert
2011-04-06 16:14 ` Eric Dumazet [this message]
2011-04-06 17:05 ` Alexander Duyck
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