From owner-freebsd-current@FreeBSD.ORG Tue Jul 20 10:42:26 2004 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 8518C16A4CE for ; Tue, 20 Jul 2004 10:42:26 +0000 (GMT) Received: from gundel.de.clara.net (gundel.de.clara.net [212.82.225.86]) by mx1.FreeBSD.org (Postfix) with ESMTP id 4ED6343D62 for ; Tue, 20 Jul 2004 10:42:26 +0000 (GMT) (envelope-from jesk@killall.org) Received: from port-212-202-54-113.dynamic.qsc.de ([212.202.54.113] helo=turbofresse) by gundel.de.clara.net with smtp (Exim 4.30; FreeBSD) id 1BmsEK-000JpX-GH for freebsd-current@freebsd.org; Tue, 20 Jul 2004 12:52:16 +0200 Message-ID: <028601c46e46$38fc9560$45fea8c0@turbofresse> From: "jesk" To: Date: Tue, 20 Jul 2004 12:42:15 +0200 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2600.0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 Subject: I/O or Threading Suffer X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 20 Jul 2004 10:42:26 -0000 hello, i got problems with mysql under freebsd 5.2.1 and CURRENT. i got these problems on two machines with different hardware, but both are single cpu machines. used scheduler is ULE. problem description: under high i/o load the mysqld isnt responding any more. i tested this with dd if=/dev/urandom of=testfile bs=128k on the hdd an was not able to become any ouput from simple select-statements within a long period of time (above minutes). i dont know if this problem occurs from mysql and its threads or if the i/o subsystem has any problems to deal fast enough with two intensives read and write processes and its priorities. best regards, christian