From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: "David S. Miller" <davem@redhat.com>
Cc: ebiederm@xmission.com, hadi@cyberus.ca, akpm@digeo.com,
manfred@colorfullife.com, netdev@oss.sgi.com,
linux-kernel@vger.kernel.org
Subject: Re: Info: NAPI performance at "low" loads
Date: 18 Sep 2002 22:15:27 +0100 [thread overview]
Message-ID: <1032383727.20463.155.camel@irongate.swansea.linux.org.uk> (raw)
In-Reply-To: <20020918.134630.127509858.davem@redhat.com>
On Wed, 2002-09-18 at 21:46, David S. Miller wrote:
> From: Alan Cox <alan@lxorguk.ukuu.org.uk>
> Date: 18 Sep 2002 21:43:09 +0100
>
> The inb timing depends on the PCI bus. If you want proof set a Matrox
> G400 into no pci retry mode, run a large X load at it and time some inbs
> you should be able to get to about 100 milliseconds for an inb to
> execute
>
> Matrox isn't using inb/outb instructions to IO space, it is being
> accessed by X using MEM space which is done using normal load and
> store instructions on x86 after the card is mmap()'d into user space.
It doesnt matter what XFree86 is doing. Thats just to load the PCI bus
and jam it up to prove the point. It'll change your inb timing
next prev parent reply other threads:[~2002-09-18 21:06 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-17 19:53 Info: NAPI performance at "low" loads Manfred Spraul
2002-09-17 20:59 ` David S. Miller
2002-09-17 21:32 ` Andrew Morton
2002-09-17 21:26 ` David S. Miller
2002-09-17 21:45 ` Andrew Morton
2002-09-17 21:39 ` David S. Miller
2002-09-17 21:54 ` Jeff Garzik
2002-09-17 21:49 ` David S. Miller
2002-09-18 2:11 ` Jeff Garzik
2002-09-18 2:06 ` David S. Miller
2002-09-18 2:36 ` Jeff Garzik
2002-09-17 21:58 ` Andrew Morton
2002-09-18 0:57 ` jamal
2002-09-18 1:00 ` David S. Miller
2002-09-18 2:16 ` Andrew Morton
2002-09-18 17:27 ` Eric W. Biederman
2002-09-18 17:50 ` Alan Cox
2002-09-19 14:58 ` Eric W. Biederman
2002-09-18 20:23 ` David S. Miller
2002-09-18 20:43 ` Alan Cox
2002-09-18 20:46 ` David S. Miller
2002-09-18 21:15 ` Alan Cox [this message]
2002-09-18 21:22 ` David S. Miller
2002-09-19 15:03 ` Eric W. Biederman
2002-09-19 15:53 ` Alan Cox
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1032383727.20463.155.camel@irongate.swansea.linux.org.uk \
--to=alan@lxorguk.ukuu.org.uk \
--cc=akpm@digeo.com \
--cc=davem@redhat.com \
--cc=ebiederm@xmission.com \
--cc=hadi@cyberus.ca \
--cc=linux-kernel@vger.kernel.org \
--cc=manfred@colorfullife.com \
--cc=netdev@oss.sgi.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).