From: Ralf Baechle <ralf@oss.sgi.com>
To: Carsten Langgaard <carstenl@mips.com>
Cc: carlson@sibyte.com, linux-mips@oss.sgi.com
Subject: Re: _clear_page semantics
Date: Wed, 10 Jan 2001 13:34:39 -0200 [thread overview]
Message-ID: <20010110133438.A2103@bacchus.dhis.org> (raw)
In-Reply-To: <3A5C1868.A6B54E57@mips.com>; from carstenl@mips.com on Wed, Jan 10, 2001 at 09:08:08AM +0100
On Wed, Jan 10, 2001 at 09:08:08AM +0100, Carsten Langgaard wrote:
> You are absolutely right, it is implementation dependent.
> I just tend to use the mips32 implementation for my R4000s as well, and here as
> Ralf mention it is performance improving.
> Actually we have included a CPU option flag (MIPS_CPU_CACHE_CDEX), what tells us
> if the CPU has the Create_Dirty_Exclusive CACHE operation available.
> So we should probably use it, now it is here :-)
Homework for somebody with some time at his hands - we have a large number
of unrolled loops for all sorts of cache variations in r4xx0.c. Benchmark
if they actually improve performance. I wouldn't wonder if due to a large
number of pipeline stalls in one of those routines the whole unrolling
business doesn't buy us anything.
Ralf
prev parent reply other threads:[~2001-01-10 15:45 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-01-10 1:48 _clear_page semantics Justin Carlson
2001-01-10 5:03 ` Ralf Baechle
2001-01-10 8:08 ` Carsten Langgaard
2001-01-10 15:34 ` Ralf Baechle [this message]
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