mirror of https://lore.kernel.org/lkml/
 help / color / mirror / Atom feed
From: Thomas Gleixner <tglx@linutronix.de>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
	linux-rt-users <linux-rt-users@vger.kernel.org>,
	akpm@osdl.org, Ingo Molnar <mingo@elte.hu>,
	Clark Williams <clark.williams@gmail.com>,
	Peter Zijlstra <peterz@infradead.org>,
	"Luis Claudio R. Goncalves" <lclaudio@uudg.org>,
	Gregory Haskins <ghaskins@novell.com>, Andi Kleen <ak@suse.de>,
	Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [PATCH] x86: enable preemption in delay
Date: Sun, 25 May 2008 22:21:51 +0200 (CEST)	[thread overview]
Message-ID: <alpine.LFD.1.10.0805252217580.3295@apollo.tec.linutronix.de> (raw)
In-Reply-To: <Pine.LNX.4.58.0805250915410.20625@gandalf.stny.rr.com>

On Sun, 25 May 2008, Steven Rostedt wrote:
> 
> On Sun, 25 May 2008, Thomas Gleixner wrote:
> >
> > +/*
> > + * 5 usec on a 1GHZ machine. Not necessarily correct, but not too long
> > + * either.
> 
> And what happens when we have 10GHz boxes that can do migration in 1us,
> and the delay that is asked for is 2us. We can return early.  I don't like
> to place assumptions of this kind that can hurt with future hardware
> enhancements.

Do the math. It's 500ns on a 10GHz machine then. So nothing to worry
about and future proof. 

Also when those 10GHZ machines arrive the synchronized TSC should have
finally become reality.

Thanks,

	tglx

  parent reply	other threads:[~2008-05-25 20:23 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-05-25  3:11 Steven Rostedt
2008-05-25 12:44 ` Thomas Gleixner
2008-05-25 13:07   ` Steven Rostedt
2008-05-25 13:17   ` Steven Rostedt
2008-05-25 13:19     ` Alan Cox
2008-05-25 13:40       ` Steven Rostedt
2008-05-25 20:21     ` Thomas Gleixner [this message]
2008-05-25 13:35   ` [PATCH -v2] " Steven Rostedt
2008-05-25 13:44     ` Steven Rostedt
2008-05-25 13:51       ` [PATCH -v3] " Steven Rostedt
2008-05-25 15:04         ` Steven Rostedt
2008-05-25 15:13         ` [PATCH -v4] " Steven Rostedt
2008-05-25 18:01   ` [PATCH] " Pavel Machek
2008-05-28 13:01     ` Steven Rostedt
2008-05-31  7:18       ` Pavel Machek
2008-05-25 18:53 ` Arjan van de Ven
2008-05-25 19:01   ` Thomas Gleixner
2008-05-25 19:28     ` Arjan van de Ven
2008-05-25 19:32   ` Steven Rostedt

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=alpine.LFD.1.10.0805252217580.3295@apollo.tec.linutronix.de \
    --to=tglx@linutronix.de \
    --cc=ak@suse.de \
    --cc=akpm@osdl.org \
    --cc=clark.williams@gmail.com \
    --cc=ghaskins@novell.com \
    --cc=lclaudio@uudg.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-rt-users@vger.kernel.org \
    --cc=mingo@elte.hu \
    --cc=peterz@infradead.org \
    --cc=rostedt@goodmis.org \
    --cc=torvalds@linux-foundation.org \
    /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
all inboxes | Powered by JetHome®