From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from sc8-sf-mx1-b.sourceforge.net ([10.3.1.11] helo=sc8-sf-mx1.sourceforge.net) by sc8-sf-list1.sourceforge.net with esmtp (Exim 4.30) id 1BYDx3-000376-E9 for user-mode-linux-devel@lists.sourceforge.net; Wed, 09 Jun 2004 18:01:53 -0700 Received: from [12.177.129.25] (helo=ccure.user-mode-linux.org) by sc8-sf-mx1.sourceforge.net with esmtp (TLSv1:DES-CBC3-SHA:168) (Exim 4.30) id 1BYDx2-0001K7-TS for user-mode-linux-devel@lists.sourceforge.net; Wed, 09 Jun 2004 18:01:53 -0700 Message-Id: <200406100152.i5A1q5is009173@ccure.user-mode-linux.org> Subject: Re: [uml-devel] Re: The SKAS4 patch?? + ideas for 0 context-switch In-Reply-To: Your message of "Wed, 09 Jun 2004 23:05:24 +0200." <200406092305.24447.blaisorblade_spam@yahoo.it> References: <200406071949.04220.blaisorblade_spam@yahoo.it> <200406080455.i584tad2023374@ccure.user-mode-linux.org> <200406092305.24447.blaisorblade_spam@yahoo.it> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii From: Jeff Dike Sender: user-mode-linux-devel-admin@lists.sourceforge.net Errors-To: user-mode-linux-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Id: The user-mode Linux development list List-Post: List-Help: List-Subscribe: , List-Archive: Date: Wed, 09 Jun 2004 21:52:05 -0400 To: BlaisorBlade Cc: user-mode-linux-devel@lists.sourceforge.net blaisorblade_spam@yahoo.it said: > I don't think that a flush of fewer TLBs would be faster; what (In My > Ignorant Opinion) slows things down is not clearing a buffer (it will > probably cost 1 cycle, if they put a RESET pin in the TLBs), but > reloading its content when memory is read; > Well, actually it comes to changing 2 segments descriptors (the ones > for USER_CS and USER_DS) > Well, using segments here means that the CS and DS descriptor limit > are lowered, not that I increase base_addr - are you sure that this > would have a cost? Currently the check is not "disabled" - just the > check value is MAX_PTR (0xffff....). Yes, the CPUs could be smart > enough to optimize the check out... You are being way too casual and hard-waving about all this. I've heard scary numbers for all of these. > I'll try to see if Intel manuals say anything about this. Yes, spend some quality time with the Intel manuals, and see what they say. > Well, this is the most important one... I'll try to investigate on > this. Actually, the most important factor to me is virtual address space. Jeff ------------------------------------------------------- This SF.Net email is sponsored by: GNOME Foundation Hackers Unite! GUADEC: The world's #1 Open Source Desktop Event. GNOME Users and Developers European Conference, 28-30th June in Norway http://2004/guadec.org _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel