From: Ralf Baechle <ralf@linux-mips.org>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Vivien Chappelier <vivienc@nerim.net>,
linux-mips@linux-mips.org, Ilya Volynets <ilya@theIlya.com>
Subject: Re: [PATCH 2.5] SGI O2 framebuffer driver
Date: Thu, 12 Dec 2002 13:20:22 +0100 [thread overview]
Message-ID: <20021212132022.A5060@linux-mips.org> (raw)
In-Reply-To: <1039697045.21231.13.camel@irongate.swansea.linux.org.uk>; from alan@lxorguk.ukuu.org.uk on Thu, Dec 12, 2002 at 12:44:05PM +0000
On Thu, Dec 12, 2002 at 12:44:05PM +0000, Alan Cox wrote:
> > The O2 is non-cache coherent. So with the fairly large write-back second
> > level caches enabled frame buffer write could potencially be delayed
> > indefinately but in any case quite long. Frame buffers are usually only
>
> You can flush the frame buffer pages that were touched at the end of an
> operation though
Flushes are very expensive operations, on the order of 16 cycles per
cacheline plus memory delay. So why using them when just using the right
cache mode does the right thing already.
Ralf
next prev parent reply other threads:[~2002-12-12 12:26 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20020903205816.A25897@linux-mips.org>
2002-12-11 22:25 ` [PATCH 2.5] SGI O2 framebuffer driver Vivien Chappelier
2002-12-11 23:15 ` Alan Cox
2002-12-11 23:41 ` Vivien Chappelier
2002-12-12 1:31 ` Alan Cox
2002-12-12 2:33 ` Ralf Baechle
2002-12-12 12:44 ` Alan Cox
2002-12-12 12:20 ` Ralf Baechle [this message]
2002-12-12 12:52 ` Dominic Sweetman
2002-12-12 14:07 ` Ralf Baechle
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