From: Jonathan Lundell <linux@lundell-bros.com>
To: Pavel Machek <pavel@ucw.cz>, "Filipau, Ihar" <ifilipau@sussdd.de>
Cc: "'linux-kernel@vger.kernel.org'" <linux-kernel@vger.kernel.org>
Subject: Re: inw/outw performance
Date: Sun, 30 Mar 2003 12:32:06 -0800 [thread overview]
Message-ID: <p0521061cbaad04701a02@[207.213.214.37]> (raw)
In-Reply-To: <20030330172306.GA6666@zaurus.ucw.cz>
At 7:23pm +0200 3/30/03, Pavel Machek wrote:
> > And actually what I have found that on my development P3/1GHz system
>> every inw() takes more that 3us. I wasn't measuring outw() yet - but
>> I do not expect its timing to be better.
>
>inw/outw *is* slow. Memory map your
>registers to speed it up.
Shouldn't be *that* slow, though, especially over PCI, unless the
device in question is taking that long to respond--in which case
memory mapping won't help.
--
/Jonathan Lundell.
next prev parent reply other threads:[~2003-03-30 20:21 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-03-28 8:00 Filipau, Ihar
2003-03-30 17:23 ` Pavel Machek
2003-03-30 20:32 ` Jonathan Lundell [this message]
2003-03-31 8:41 Filipau, Ihar
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