From owner-freebsd-current@FreeBSD.ORG Fri Oct 5 19:59:36 2007 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 97B7B16A553 for ; Fri, 5 Oct 2007 19:59:36 +0000 (UTC) (envelope-from matrix@itlegion.ru) Received: from corpmail.itlegion.ru (corpmail.itlegion.ru [84.21.226.211]) by mx1.freebsd.org (Postfix) with SMTP id B87C113C48A for ; Fri, 5 Oct 2007 19:59:35 +0000 (UTC) (envelope-from matrix@itlegion.ru) Received: (qmail 70243 invoked from network); 5 Oct 2007 23:59:33 +0400 Received: from unknown (HELO Artem) (192.168.0.12) by 84.21.226.211 with SMTP; 5 Oct 2007 23:59:33 +0400 X-AntiVirus: Checked by Dr.Web [version: 4.44, engine: 4.44.0.09170, virus records: 246914, updated: 5.10.2007] Message-ID: <012901c8078a$400faeb0$0c00a8c0@Artem> From: "Artem Kuchin" To: Date: Fri, 5 Oct 2007 23:52:33 +0400 Organization: IT Legion MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="koi8-r"; reply-type=original Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 Subject: TSO4 network problems and scheduler selection X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 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: Fri, 05 Oct 2007 19:59:36 -0000 Hi! A couple of weeks ago i have written about TSO4 problems on em network interface. The problem was that when TSO4 is enable em stream send perfomace drop to about ZERO. (i cannot download any file from ftp, i canont even get midnight commander to draw a full screen in ssh client). Noone has found any solution and it was decided that it was a bug in em driver. Today i have played with SCHED_ULE scheduler on this box (it is 7-CURRENT, Pentium D). Adn accidentaly found out that when SCHED_ULE is selected TSO4 does not cause any problems. My interface: em0: flags=8843 metric 0 mtu 1500 options=18b This is totally weird, but i'm letting everybody know it if someone step into this problem. Viva SCHED_ULE! -- Regards, Artem