From owner-freebsd-questions@FreeBSD.ORG Sun Sep 24 02:53:21 2006 Return-Path: X-Original-To: questions@freebsd.org Delivered-To: freebsd-questions@FreeBSD.ORG Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id A032E16A40F for ; Sun, 24 Sep 2006 02:53:21 +0000 (UTC) (envelope-from pauls@utdallas.edu) Received: from mail.stovebolt.com (mail.stovebolt.com [66.221.101.248]) by mx1.FreeBSD.org (Postfix) with ESMTP id 3590143D4C for ; Sun, 24 Sep 2006 02:53:21 +0000 (GMT) (envelope-from pauls@utdallas.edu) Received: from [192.168.2.102] (adsl-66-142-190-185.dsl.rcsntx.swbell.net [66.142.190.185]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.stovebolt.com (Postfix) with ESMTP id 19658114314 for ; Sat, 23 Sep 2006 21:54:43 -0500 (CDT) Date: Sat, 23 Sep 2006 21:53:18 -0500 From: Paul Schmehl To: questions@freebsd.org Message-ID: <188DD322AA361E26DFC311B9@paul-schmehls-powerbook59.local> X-Mailer: Mulberry/4.0.5 (Mac OS X) MIME-Version: 1.0 Content-Type: multipart/signed; micalg=sha1; protocol="application/pkcs7-signature"; boundary="==========5DC5F6C85DA5260C78C4==========" X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Cc: Subject: Device polling - worthwhile? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 24 Sep 2006 02:53:21 -0000 --==========5DC5F6C85DA5260C78C4========== Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: quoted-printable Content-Disposition: inline I've been reading about device polling. I'm wondering if it's worth doing = on a busy website (4,000,000+ hits/month, 45GB+ bandwidth use). I=20 understand what polling is and how it queues traffic as opposed to the=20 "old-fashioned" interrupt method, but do you really gain performance-wise? = Are there any pitfalls to enabling it in the kernel? (I understand you=20 can enable/disable it using ifconfig.) Any gotchas regarding tuning?=20 (This is a production website. I don't want to cause problems that are=20 hard to figure out.) If it matters, I'm running 6.1 RELEASE, GENERIC kernel, Broadcomm GIG=20 NICs, 3.2GHz processor, 2GB of memory, apache 1.3.* Paul Schmehl (pauls@utdallas.edu) Adjunct Information Security Officer The University of Texas at Dallas http://www.utdallas.edu/ir/security/ --==========5DC5F6C85DA5260C78C4==========--