From mboxrd@z Thu Jan 1 00:00:00 1970 In-Reply-To: Date: Fri, 2 Jul 1999 20:04:17 +0200 To: Geert Uytterhoeven , linuxppc-dev@lists.linuxppc.org From: Benjamin Herrenschmidt Subject: Re: Problems with the atyfb driver on Power Mac G3 Message-Id: <19990702200417.013965@mail.mipsys.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: owner-linuxppc-dev@lists.linuxppc.org List-Id: On Fri, Jul 2, 1999, Geert Uytterhoeven wrote: >To get maximum performance, you want a low threshold-empty value and a high >threshold-full value, because SGRAM is optimized for burst accesses, but has a >high latency for the initial access. Higher threshold-empty and lower >threshold-full values are more conservative and more likely to not disturb the >screen, but lower the performance. What about providing a private ioctl to set those threshold values ? With a simple command line tool and eventually a pair of sliders on X, this would allow people to try out and us to collect infos about behaviour of various values on various configurations, and eventually provide more conservative default values, and letting the user eventually increase performances later. -- Perso. e-mail: Work e-mail: BenH. Web : [[ This message was sent via the linuxppc-dev mailing list. Replies are ]] [[ not forced back to the list, so be sure to Cc linuxppc-dev if your ]] [[ reply is of general interest. Please check http://lists.linuxppc.org/ ]] [[ and http://www.linuxppc.org/ for useful information before posting. ]]