From: "David S. Miller" <davem@redhat.com>
To: alan@lxorguk.ukuu.org.uk
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: Wed, 18 Sep 2002 13:46:30 -0700 (PDT) [thread overview]
Message-ID: <20020918.134630.127509858.davem@redhat.com> (raw)
In-Reply-To: <1032381789.20498.151.camel@irongate.swansea.linux.org.uk>
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.
next prev parent reply other threads:[~2002-09-18 20:50 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 [this message]
2002-09-18 21:15 ` Alan Cox
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=20020918.134630.127509858.davem@redhat.com \
--to=davem@redhat.com \
--cc=akpm@digeo.com \
--cc=alan@lxorguk.ukuu.org.uk \
--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).