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SubjectRe: prioritize PCI traffic ?
On 1/17/07, Hans-Peter Jansen <hpj@urpla.net> wrote:
> Am Montag, 15. Januar 2007 15:53 schrieb Vaidyanathan Srinivasan:
> >
> > 33Mhz 32-bit PCI bus on typical PC can do around 100MB/sec...
>
> Substract roughly n * 5MB for VIA chipsets, where n is the age (1 <= n <=
> 4), and even more for SIS, ATI..

While developing the latency tracer in the -rt kernel, Ingo and others
discovered that some SATA controllers can produce very bad DMA
starvation at higher speeds. A latency trace of such an event looks
like the entire system is going in slow motion. Presumably, vendors
do this to improve benchmark scores.

Try forcing your drives to a lower speed.

Lee
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