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Open Source and information security mailing list archives
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Date: Fri, 26 Jan 2007 19:32:40 -0500 From: "Lee Revell" <rlrevell@...-job.com> To: "Hans-Peter Jansen" <hpj@...la.net> Cc: linux-kernel@...r.kernel.org, "Vaidyanathan Srinivasan" <svaidy@...ux.vnet.ibm.com>, "Soeren Sonnenburg" <kernel@....de> Subject: Re: prioritize PCI traffic ? On 1/17/07, Hans-Peter Jansen <hpj@...la.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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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