From: ebiederm@xmission.com (Eric W. Biederman)
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: geert@linux-m68k.org (Geert Uytterhoeven),
jsimmons@linux-fbdev.org (James Simmons),
lk@tantalophile.demon.co.uk (Jamie Lokier),
linux-kernel@vger.kernel.org (Linux Kernel Mailing List),
linux-fbdev-devel@lists.sourceforge.net (Linux Fbdev development
list)
Subject: Re: [Linux-fbdev-devel] Re: fbcon slowness [was NTP on 2.4.2?]
Date: 04 Apr 2001 01:50:41 -0600 [thread overview]
Message-ID: <m1lmphw1bi.fsf@frodo.biederman.org> (raw)
In-Reply-To: <E14kPoq-0007w5-00@the-village.bc.nu>
In-Reply-To: Alan Cox's message of "Tue, 3 Apr 2001 13:21:53 +0100 (BST)"
Alan Cox <alan@lxorguk.ukuu.org.uk> writes:
> > > The MMX memcpy for CyrixIII and Athlon boxes is something like twice the
> > > speed of rep movs. On most pentium II/III boxes the fast paths for rep movs
> > > and for MMX are the same speed
> >
> > As long as you are copying in real memory. So the PCI bus or the host bridge
> > implementation may be the actual limit.
>
> The CyrixIII sits on the same host bridges as the intel processors
I don't know if it applies to this case but one thing I have seen make
a noticeable difference is whether or not write-combining is enabled.
If we have only be enabling MTRR's for intel this could do account
for it.
Eric
next prev parent reply other threads:[~2001-04-04 7:53 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-03-31 4:11 [Linux-fbdev-devel] Re: fbcon slowness [was NTP on 2.4.2?] James Simmons
2001-04-02 22:44 ` Alan Cox
2001-04-03 6:23 ` Geert Uytterhoeven
2001-04-03 12:21 ` Alan Cox
2001-04-04 7:50 ` Eric W. Biederman [this message]
2001-04-04 8:47 ` Jamie Lokier
-- strict thread matches above, loose matches on Subject: below --
2001-04-05 3:04 James Simmons
2001-04-05 12:03 ` Eric W. Biederman
2001-04-05 12:12 ` Geert Uytterhoeven
2001-04-05 13:15 ` Maciej W. Rozycki
2001-04-05 18:20 ` Eric W. Biederman
2001-04-06 10:09 ` Ivan Kokshaysky
2001-04-06 13:19 ` Eric W. Biederman
2001-04-06 17:27 ` Maciej W. Rozycki
2001-04-06 18:34 ` Andrea Arcangeli
2001-04-06 19:31 ` Maciej W. Rozycki
2001-04-06 17:13 ` Maciej W. Rozycki
2001-04-08 18:11 ` Ivan Kokshaysky
2001-04-09 10:02 ` Maciej W. Rozycki
2001-04-09 11:05 ` Ivan Kokshaysky
2001-04-06 17:07 ` Maciej W. Rozycki
2001-04-03 2:04 James Simmons
2001-04-01 14:54 James Simmons
2001-04-01 21:35 ` Jamie Lokier
2001-03-31 4:15 James Simmons
2001-03-31 3:47 James Simmons
2001-03-31 14:15 ` Jamie Lokier
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