From: Adrian Cox <apc@agelectronics.co.uk>
To: Gabriel Paubert <paubert@iram.es>
Cc: linuxppc-dev@lists.linuxppc.org
Subject: Re: PATCH: improved processor config for G3s
Date: Tue, 05 Sep 2000 12:32:31 +0100 [thread overview]
Message-ID: <39B4D9CF.FEED2CB8@agelectronics.co.uk> (raw)
In-Reply-To: Pine.HPX.4.10.10009041309060.15438-100000@gra-ux1.iram.es
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/
next prev parent reply other threads:[~2000-09-05 11:32 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-09-03 13:03 PATCH: improved processor config for G3s Michel Lanners
2000-09-03 13:43 ` Benjamin Herrenschmidt
2000-09-04 9:48 ` Gabriel Paubert
2000-09-04 10:34 ` Adrian Cox
2000-09-04 10:54 ` Benjamin Herrenschmidt
2000-09-05 9:49 ` Gabriel Paubert
2000-09-05 10:50 ` Benjamin Herrenschmidt
2000-09-05 11:06 ` Gabriel Paubert
2000-09-05 11:32 ` Adrian Cox [this message]
2000-09-04 17:51 ` Michel Lanners
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