Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S268316AbUIPXDq (ORCPT ); Thu, 16 Sep 2004 19:03:46 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S268314AbUIPXDp (ORCPT ); Thu, 16 Sep 2004 19:03:45 -0400 Received: from smtp.Lynuxworks.com ([207.21.185.24]:5130 "EHLO smtp.lynuxworks.com") by vger.kernel.org with ESMTP id S268316AbUIPXBV (ORCPT ); Thu, 16 Sep 2004 19:01:21 -0400 Date: Thu, 16 Sep 2004 16:01:16 -0700 To: "David S. Miller" Cc: Bill Huey , davidsen@tmr.com, linux-kernel@vger.kernel.org, mingo@elte.hu Subject: Re: [patch] remove the BKL (Big Kernel Lock), this time for real Message-ID: <20040916230116.GA4427@nietzsche.lynx.com> References: <20040916222903.GA4089@nietzsche.lynx.com> <20040916154011.3f0dbd54.davem@davemloft.net> <20040916225102.GA4386@nietzsche.lynx.com> <20040916155412.47649ba6.davem@davemloft.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20040916155412.47649ba6.davem@davemloft.net> User-Agent: Mutt/1.5.6+20040818i From: Bill Huey (hui) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1451 Lines: 30 On Thu, Sep 16, 2004 at 03:54:12PM -0700, David S. Miller wrote: > On Thu, 16 Sep 2004 15:51:02 -0700 > Bill Huey (hui) wrote: > > > Judging from how the Linux code is done and the numbers I get from > > Bill Irwin in casual conversation, the Linux SMP approach is clearly > > the right track at this time with it's hand honed per-CPU awareness of > > things. The only serious problem that spinlocks have as they aren't > > preemptable, which is what Ingo is trying to fix. > > This is what Linus proclaimed 6 or 7 years ago when people were > trying to convince us to do things like Solaris and other big > Unixes at the time. FreeBSD's SMPng project is stalled for the most part and developers that disagree with that approach have move onto the DragonFly BSD community. It has a much more top-down driven locking system that's conceptually CPU local called tokens, effectively deadlock free and difficult to misused. It's already been able to multi-thread the networking stack using lock-less techniques, while the FreeBSD-current tree had to retract their "all or nothing" approach with threading their network stack. Jeffery Hsu is the main developer pushing that subsystem. bill - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/