From owner-freebsd-performance@FreeBSD.ORG Fri Jun 22 10:28:25 2007 Return-Path: X-Original-To: freebsd-performance@freebsd.org Delivered-To: freebsd-performance@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 6E23E16A468 for ; Fri, 22 Jun 2007 10:28:25 +0000 (UTC) (envelope-from stas@FreeBSD.org) Received: from com1.ht-systems.ru (com1.ht-systems.ru [83.97.104.204]) by mx1.freebsd.org (Postfix) with ESMTP id BE9A913C46C for ; Fri, 22 Jun 2007 10:28:23 +0000 (UTC) (envelope-from stas@FreeBSD.org) Received: from [85.21.245.235] (helo=phonon.SpringDaemons.com) by com1.ht-systems.ru with esmtpa (Exim 4.62) (envelope-from ) id 1I1g1x-0002am-6N; Fri, 22 Jun 2007 14:06:17 +0400 Received: from localhost (localhost [127.0.0.1]) by phonon.SpringDaemons.com (Postfix) with SMTP id 443011140A; Fri, 22 Jun 2007 14:03:26 +0400 (MSD) Date: Fri, 22 Jun 2007 14:03:17 +0400 From: Stanislav Sedov To: Thomas Vogt Message-Id: <20070622140317.b2c8075e.stas@FreeBSD.org> In-Reply-To: <46712605.5090907@bsdunix.ch> References: <4671118D.1040404@bsdunix.ch> <200706140806.05674.tec@mega.net.br> <46712605.5090907@bsdunix.ch> Organization: The FreeBSD Project X-Mailer: carrier-pigeon X-Voice: +7 916 849 20 23 X-XMPP: ssedov@jabber.ru X-ICQ: 208105021 X-Yahoo: stanislav_sedov X-PGP-Fingerprint: F21E D6CC 5626 9609 6CE2 A385 2BF5 5993 EB26 9581 X-University: MEPhI Mime-Version: 1.0 Content-Type: multipart/signed; protocol="application/pgp-signature"; micalg="PGP-SHA1"; boundary="Signature=_Fri__22_Jun_2007_14_03_17_+0400_AQkMawPt0S/Y6Y1K" X-Spam-Flag: SKIP X-Spam-Yversion: Spamooborona 1.6.0 Cc: NOC Meganet , freebsd-performance@freebsd.org Subject: Re: PAPI in the ports X-BeenThere: freebsd-performance@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Performance/tuning List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 22 Jun 2007 10:28:25 -0000 --Signature=_Fri__22_Jun_2007_14_03_17_+0400_AQkMawPt0S/Y6Y1K Content-Type: text/plain; charset=US-ASCII Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, 14 Jun 2007 13:27:01 +0200 Thomas Vogt mentioned: >=20 > Yes you're right. But to have a such feature on a production system is > nice if you have to debug issues. If I get a problem I can easily debug > it without to simulate everything in the lab. It's not that I want to > run such features 24/7. >=20 > But perhaps "options HWPMC_HOOKS" in the kernel enables some hooks which > could cause performance penalties even if I don't actively use such > feature very often. Like many other debug options in the kernel. I don't > know. >=20 I'm using "options HWPMC_HOOKS" on heavily loaded web server almost constantly, no visible penalty at all. Just my 2 cents. --=20 Stanislav Sedov ST4096-RIPE --Signature=_Fri__22_Jun_2007_14_03_17_+0400_AQkMawPt0S/Y6Y1K Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.4 (FreeBSD) iD8DBQFGe55uK/VZk+smlYERAuChAJ9bGF/MFT8ONwrs1L4Xp+9eTAbUOwCdHjR3 rkMpuP5LQgG9C4EOhcdaP94= =brFL -----END PGP SIGNATURE----- --Signature=_Fri__22_Jun_2007_14_03_17_+0400_AQkMawPt0S/Y6Y1K--