From owner-freebsd-performance@FreeBSD.ORG Fri Mar 24 13:12:05 2006 Return-Path: X-Original-To: freebsd-performance@freebsd.org Delivered-To: freebsd-performance@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 6011E16A400 for ; Fri, 24 Mar 2006 13:12:05 +0000 (UTC) (envelope-from oxy@field.hu) Received: from green.field.hu (green.field.hu [217.20.130.28]) by mx1.FreeBSD.org (Postfix) with ESMTP id C4D9B43D45 for ; Fri, 24 Mar 2006 13:12:04 +0000 (GMT) (envelope-from oxy@field.hu) Received: from localhost (green.field.hu [217.20.130.28]) by green.field.hu (Postfix) with ESMTP id C21A6119CD4; Fri, 24 Mar 2006 14:11:24 +0100 (CET) Received: from green.field.hu ([217.20.130.28]) by localhost (green.field.hu [217.20.130.28]) (amavisd-new, port 10024) with ESMTP id 65051-02; Fri, 24 Mar 2006 14:11:24 +0100 (CET) Received: from oxy (dsl217-197-187-71.pool.tvnet.hu [217.197.187.71]) by green.field.hu (Postfix) with ESMTP id 41CD5119CC4; Fri, 24 Mar 2006 14:11:24 +0100 (CET) Message-ID: <003301c64f44$89fdcd40$0201a8c0@oxy> From: "OxY" To: "Jin Guojun [VFFS]" , "Arne Woerner" References: <20060322071023.70808.qmail@web30305.mail.mud.yahoo.com> <442187FE.3060300@lbl.gov> Date: Fri, 24 Mar 2006 14:12:01 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2670 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2670 X-Virus-Scanned: by Amavisd-new (Spamassassin+Razor2+Pyzor+DCC+Bayes db, Clamd Antivirus) at field.hu Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Cc: freebsd-performance@freebsd.org, Gary Thorpe Subject: Re: packet drop with intel gigabit / marwell gigabit 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, 24 Mar 2006 13:12:05 -0000 hi guys! well, i changed my motherboard and CPU from the asus a7v8x+amd 2000+ xp to=20 the abit be7 + p4 2.4 (533fsb) and the packet loss fell down from 8% to = 2%, but still have loss... loss coming when i have load.. i guess it decreased because of the = bigger resources. still waiting for tipps, hints, everything :) ----- Original Message -----=20 From: Jin Guojun [VFFS]=20 To: Arne Woerner=20 Cc: Gary Thorpe ; freebsd-performance@freebsd.org ; oxy@field.hu=20 Sent: Wednesday, March 22, 2006 6:23 PM Subject: Re: packet drop with intel gigabit / marwell gigabit Arne Woerner wrote:=20 --- "Jin Guojun [VFFS]" wrote: In you example: Now your 1.6 GB/s reduced to 16MB/s or even worse just based on this factor. What did we show by this <
> test? I thought that would prove the memory bandwidth is about 8Gbit/sec (1GByte/sec; 2 * /2^30). It depends on how you use /dev/zero.=20 dd of=3D/dev/null if=3D/dev/zero bs=3D4k count=3D100k tests cache speed dd of=3D/dev/null if=3D/dev/zero bs=3D4m count=3D100 tests memory bandwidth if your cache is less than 2 MB Now you may give me the real memory bandwidth on your system :-) I would expect something around 500. Notice that your memory copy speed will be one half of it.=20 /dev/null device really does nothing beside throwing away data. That is, it can be counted as a cost for system call. -Jin