Date: Fri, 8 Oct 1999 01:07:21 -0300 (ADT) From: The Hermit Hacker <scrappy@hub.org> To: Tom <tom@sdf.com> Cc: freebsd-scsi@freebsd.org Subject: Re: DPT Controller options ... one question Message-ID: <Pine.BSF.4.10.9910080106280.30583-100000@thelab.hub.org> In-Reply-To: <Pine.BSF.4.05.9910071918310.17882-100000@misery.sdf.com>
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Okay, thanks...
If there are cache's on the DPT controllers, does the OS make use of
that, or is it automagic and transparent to the OS? Just want to make
sure I'm getting full use of these things...
Thanks...
On Thu, 7 Oct 1999, Tom wrote:
>
> On Thu, 7 Oct 1999, The Hermit Hacker wrote:
>
> > # DPT_FREELIST_IS_STACK For optimal L{1,2} CPU cache utilization,
> > # enable this option. Otherwise, the transaction
> > # queue is a LIFO. I cannot measure the performance
> > # gain.
> >
> > First part seems to indicate its a good thing to enable, second part seems
> > to indicate it makes no different whether I do or not...*raised eyebrow*
>
> As I understand, the feature looked good on the drawing board, but once
> implemented didn't hold as much benefit as it would thought it could. The
> feature was left in anyways. As I understand, it makes about 1 to 2%
> difference.
>
> > Marc G. Fournier ICQ#7615664 IRC Nick: Scrappy
> > Systems Administrator @ hub.org
> > primary: scrappy@hub.org secondary: scrappy@{freebsd|postgresql}.org
>
> Tom
>
Marc G. Fournier ICQ#7615664 IRC Nick: Scrappy
Systems Administrator @ hub.org
primary: scrappy@hub.org secondary: scrappy@{freebsd|postgresql}.org
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