linux-kernel - Re: prioritize PCI traffic ?

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Message-ID: <75b66ecd0701261632q1a93b487u81539d850df10db0@mail.gmail.com>
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
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