From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Alexander Duyck <alexander.h.duyck@intel.com>
Cc: Wei Gu <wei.gu@ericsson.com>,
Eric Dumazet <eric.dumazet@gmail.com>,
netdev <netdev@vger.kernel.org>,
"Kirsher, Jeffrey T" <jeffrey.t.kirsher@intel.com>,
Mike Galbraith <efault@gmx.de>
Subject: Re: Low performance Intel 10GE NIC (3.2.10) on 2.6.38 Kernel
Date: Thu, 14 Apr 2011 18:56:42 +0200 [thread overview]
Message-ID: <1302800202.2035.32.camel@laptop> (raw)
In-Reply-To: <4DA723F1.7000901@intel.com>
On Thu, 2011-04-14 at 09:42 -0700, Alexander Duyck wrote:
> I'm doing some more digging into this now. One thought that occurred to
> me is that if the patch you mention is having some sort of effect this
> could be a sign of perhaps a kernel timer or scheduling problem.
Right, so the removal of the NO_HZ throttle will allow the CPU to go
into C states more often, this could result in longer wake-up times for
IRQs.
We reverted because:
- it caused significant battery drain due to not going into C states
often enough, and
- its a much better idea to implement these things in the idle
governor since it already has the job of guestimating the idle
duration.
I really can't remember back far enough to even come up with a theory of
why kernels prior to merging the NO_HZ throttle would not exhibit this
problem.
next prev parent reply other threads:[~2011-04-14 16:54 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <D12839161ADD3A4B8DA63D1A134D084026E48B9BEB@ESGSCCMS0001.eapac.ericsson.se>
2011-04-07 4:58 ` Question on "net: allocate skbs on local node" Eric Dumazet
2011-04-07 5:16 ` Eric Dumazet
2011-04-07 6:16 ` Eric Dumazet
2011-04-07 7:22 ` Low performance Intel 10GE NIC (3.2.10) on 2.6.38 Kernel Wei Gu
2011-04-07 8:07 ` Eric Dumazet
2011-04-07 8:39 ` Wei Gu
2011-04-07 9:06 ` Eric Dumazet
2011-04-07 11:15 ` Wei Gu
2011-04-07 11:46 ` Eric Dumazet
2011-04-07 13:41 ` Eric Dumazet
2011-04-07 15:58 ` Alexander Duyck
2011-04-07 16:03 ` Eric Dumazet
2011-04-07 16:20 ` Alexander Duyck
2011-04-07 16:37 ` Eric Dumazet
2011-04-08 8:59 ` Wei Gu
2011-04-08 9:07 ` Eric Dumazet
2011-04-08 9:15 ` Wei Gu
2011-04-08 9:49 ` Eric Dumazet
2011-04-08 9:59 ` Wei Gu
2011-04-08 9:41 ` Wei Gu
2011-04-08 12:19 ` Wei Gu
2011-04-08 12:56 ` Eric Dumazet
2011-04-08 14:10 ` Wei Gu
2011-04-08 14:49 ` Stephen Hemminger
2011-04-09 3:51 ` Wei Gu
2011-04-08 15:07 ` Eric Dumazet
2011-04-09 3:27 ` Wei Gu
2011-04-09 6:36 ` Eric Dumazet
2011-04-10 7:02 ` Wei Gu
2011-04-11 14:50 ` Alexander Duyck
2011-04-11 15:00 ` Wei Gu
2011-04-11 15:14 ` Wei Gu
2011-04-11 15:42 ` Eric Dumazet
2011-04-12 1:22 ` Wei Gu
2011-04-12 4:40 ` Wei Gu
2011-04-12 4:56 ` Eric Dumazet
2011-04-12 5:18 ` Wei Gu
2011-04-14 5:42 ` Wei Gu
2011-04-14 6:07 ` Eric Dumazet
2011-04-14 6:33 ` Eric Dumazet
2011-04-14 6:58 ` Wei Gu
2011-04-14 16:42 ` Alexander Duyck
2011-04-14 16:45 ` Eric Dumazet
2011-04-14 16:56 ` Peter Zijlstra [this message]
2011-04-14 16:57 ` Eric Dumazet
2011-04-14 17:49 ` Eric Dumazet
2011-04-14 19:08 ` Alexander Duyck
2011-04-15 2:10 ` Wei Gu
2011-04-15 8:57 ` Peter Zijlstra
2011-04-15 9:14 ` Wei Gu
2011-04-18 21:12 ` Jesse Brandeburg
2011-04-19 4:09 ` Wei Gu
2011-04-21 2:57 ` Wei Gu
2011-04-21 3:25 ` Wei Gu
2011-04-08 16:22 ` Alexander Duyck
2011-04-09 3:36 ` Wei Gu
2011-04-09 4:40 ` Alexander H Duyck
2011-04-09 6:12 ` Wei Gu
2011-04-28 11:23 Dana Rubin
2011-04-28 11:58 ` Eric Dumazet
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