From: Thomas Renninger <trenn@suse.de>
To: Arjan van de Ven <arjan@linux.intel.com>
Cc: "Luis R. Rodriguez" <lrodriguez@atheros.com>,
davej@redhat.com, cpufreq@vger.kernel.org,
linux-kernel@vger.kernel.org, mcgrof@gmail.com,
Matthew Garrett <mjg@redhat.com>,
Reinette Chatre <reinette.chatre@intel.com>,
Aeolus Yang <Aeolus.Yang@atheros.com>,
Amod Bodas <Amod.Bodas@atheros.com>,
David Quan <David.Quan@atheros.com>,
Kishore Jotwani <Kishore.Jotwani@atheros.com>
Subject: Re: [PATCH] cpu-freq: add troubleshooting section for FSB changes
Date: Sat, 7 Nov 2009 23:47:04 +0100 [thread overview]
Message-ID: <200911072347.05786.trenn@suse.de> (raw)
In-Reply-To: <4AF5F47C.5000402@linux.intel.com>
On Saturday 07 November 2009 11:28:12 pm Arjan van de Ven wrote:
> Thomas Renninger wrote:
>
> > On Friday 06 November 2009 09:01:00 pm Luis R. Rodriguez wrote:
> >> With cpu frequency scaling you may run into some system
> >> performance issues when the FSB changes speed due to the
> >> throughput constraints this brings on the system.
> >
> > Interesting.
> > Could you be a bit more detailed how and what kind of perfomance issues
> > are seen, please.
> > I expect IO based issues like WLAN package throughput or even lost
> > connections :)
>
> the bus doesn't get THAT slow.....
I expected wireless problems because 5 people with @atheros.com are in CC.
There is zero information about the problem itself and possibly affected
devices/machines.
> in addition, most FSB systems have the memory controller in the chipset,
> next to the PCI logic... so that the FSB bus for DMA transactions only
> carries the snoop traffic, not the whole data.
So when should people look at this?
Thomas
next prev parent reply other threads:[~2009-11-07 22:46 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-06 20:01 [PATCH] cpu-freq: add troubleshooting section for FSB changes Luis R. Rodriguez
2009-11-07 20:52 ` Thomas Renninger
2009-11-07 21:10 ` Thomas Renninger
2009-11-07 22:28 ` Arjan van de Ven
2009-11-07 22:47 ` Thomas Renninger [this message]
2009-11-07 22:59 ` Arjan van de Ven
2009-11-08 0:54 ` Matthew Garrett
2009-11-09 16:32 ` Luis R. Rodriguez
2009-11-10 12:12 ` Corrado Zoccolo
2009-11-13 17:18 ` Luis R. Rodriguez
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