From owner-freebsd-performance@FreeBSD.ORG Sun Jul 24 19:46:47 2011 Return-Path: Delivered-To: freebsd-performance@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 388D91065670 for ; Sun, 24 Jul 2011 19:46:47 +0000 (UTC) (envelope-from pieter@degoeje.nl) Received: from mx.utwente.nl (mx2.utsp.utwente.nl [130.89.2.13]) by mx1.freebsd.org (Postfix) with ESMTP id A4D3F8FC14 for ; Sun, 24 Jul 2011 19:46:46 +0000 (UTC) Received: from nox.student.utwente.nl (nox.student.utwente.nl [130.89.165.91]) by mx.utwente.nl (8.12.10/SuSE Linux 0.7) with ESMTP id p6OJDV67015565; Sun, 24 Jul 2011 21:13:31 +0200 From: Pieter de Goeje To: freebsd-performance@freebsd.org Date: Sun, 24 Jul 2011 21:13:31 +0200 User-Agent: KMail/1.9.10 References: <4E1421D9.7080808@zedat.fu-berlin.de> <5C3302CF-8EE7-489E-8D31-624DA1637B73@mac.com> <4D7F86D50198D837@> (added by postmaster@resmaa14.ono.com) In-Reply-To: <4D7F86D50198D837@> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <201107242113.31479.pieter@degoeje.nl> X-UTwente-MailScanner-Information: Scanned by MailScanner. Contact icts.servicedesk@utwente.nl for more information. X-UTwente-MailScanner: Found to be clean X-UTwente-MailScanner-From: pieter@degoeje.nl X-Spam-Status: No Cc: Eduardo Morras Subject: Re: Heavy I/O blocks FreeBSD box for several seconds 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: Sun, 24 Jul 2011 19:46:47 -0000 On Sunday 24 July 2011 20:50:14 Eduardo Morras wrote: > At 01:15 08/07/2011, you wrote: > >On Jul 7, 2011, at 3:51 PM, Hartmann, O. wrote: > > > This is quibbling. On heavy loads on networ, disk et cetera, > > > > isn't there always and also a CPU bound load? > > > >No. Properly written software blocks when waiting on network or > >disk I/O, and doesn't sit there spinning in a busy-wait consuming > >CPU until it actually gets more work to do. > > > >See select(2), kqueue(2), and friends. > > > >Regards, > > Excuse me, but where (which maillist) and when did this mail thread > started? I have searched this maillist archive and freebsd-hackers > but no success. > > TIA See http://lists.freebsd.org/pipermail/freebsd-current/2011-July/025740.html Regards, Pieter