Re: [PATCH] cpu-freq: add troubleshooting section for FSB changes

From: Thomas Renninger
Date: Sat Nov 07 2009 - 17:47:23 EST

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 are in CC.
There is zero information about the problem itself and possibly affected
> 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?

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