Date: Thu, 7 Oct 1999 19:20:04 -0700 (PDT) From: Tom <tom@sdf.com> To: The Hermit Hacker <scrappy@hub.org> Cc: freebsd-scsi@freebsd.org Subject: Re: DPT Controller options ... one question Message-ID: <Pine.BSF.4.05.9910071918310.17882-100000@misery.sdf.com> In-Reply-To: <Pine.BSF.4.10.9910071530000.393-100000@thelab.hub.org>
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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
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