From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <39B4D9CF.FEED2CB8@agelectronics.co.uk> Date: Tue, 05 Sep 2000 12:32:31 +0100 From: Adrian Cox MIME-Version: 1.0 To: Gabriel Paubert CC: linuxppc-dev@lists.linuxppc.org Subject: Re: PATCH: improved processor config for G3s References: Content-Type: text/plain; charset=us-ascii Sender: owner-linuxppc-dev@lists.linuxppc.org List-Id: Gabriel Paubert wrote: > So you need at least 3 writes, or to have one store buffer busy with a > previous write, to trigger the store gathering mechanism. This makes it > impossible to predict whether it will be used or not, and IMO not worth > the potential trouble since it will actually happen quite infrequently. This condition should be satisfied by memcpy_toio(). It won't be satisfied by fb_memmove(), which is the function that makes large virtual consoles on PowerPC so slow. It might be more interesting to try an implementation of memcpy_toio() using the DMA engines of the 106/7. - Adrian Cox, AG Electronics ** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/