From owner-freebsd-hackers Wed Nov 28 12: 5:29 2001 Delivered-To: freebsd-hackers@freebsd.org Received: from salmon.maths.tcd.ie (salmon.maths.tcd.ie [134.226.81.11]) by hub.freebsd.org (Postfix) with SMTP id 6075737B43E for ; Wed, 28 Nov 2001 12:04:58 -0800 (PST) Received: from walton.maths.tcd.ie by salmon.maths.tcd.ie with SMTP id ; 28 Nov 2001 20:04:52 +0000 (GMT) To: Makoto Matsushita Cc: hackers@FreeBSD.ORG Subject: Re: FreeBSD on vmware In-Reply-To: Your message of "Thu, 29 Nov 2001 00:07:18 +0900." <20011129000718I.matusita@jp.FreeBSD.org> Date: Wed, 28 Nov 2001 20:04:51 +0000 From: Ian Dowse Message-ID: <200111282004.aa22335@salmon.maths.tcd.ie> Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG In message <20011129000718I.matusita@jp.FreeBSD.org>, Makoto Matsushita writes: >I really know I'm doing a stupid thing, but here is benchmark results >of both "plain" and "patched" 5-current (as of Nov/26/2001). Patched >FreeBSD is about 10% faster than before. ... but only if you spend most of your time running CPU benchmarks :-) Your results show a 50-100% speed increase for operations requiring a lot of kernel activity. Remember also that interrupts etc. cause a background rate of cmpxchg instructions that is quite high. On slower CPUs (I was using a 400MHz PII), the interrupts can soak up virtually all of the available processing capacity without the patch. I suspect this effect is responsible for the most dramatic speedups. Ian To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message