Messages in this thread | | | Date | Fri, 26 Jan 2007 19:32:40 -0500 | From | "Lee Revell" <> | Subject | Re: prioritize PCI traffic ? |
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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.
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