From owner-freebsd-hackers@FreeBSD.ORG Wed Mar 21 04:55:25 2012 Return-Path: Delivered-To: hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id D999A1065676 for ; Wed, 21 Mar 2012 04:55:25 +0000 (UTC) (envelope-from adrian.chadd@gmail.com) Received: from mail-pz0-f54.google.com (mail-pz0-f54.google.com [209.85.210.54]) by mx1.freebsd.org (Postfix) with ESMTP id A987D8FC16 for ; Wed, 21 Mar 2012 04:55:25 +0000 (UTC) Received: by dald2 with SMTP id d2so1177276dal.13 for ; Tue, 20 Mar 2012 21:55:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:cc:content-type; bh=BQ7LTLBVFUqQsXFYQ8QEdTaVKULD8a28k1x93gxFJtE=; b=RGoyYPvEfQVm6oxljDY+W+TJxM0OTTkak8CRBqVdbKJ8l57ktIXPpnkMBQxQOkITj9 M9V2OFncybx2zcJo2vhV8wHIm0XzduLAoJt2zbGBf2DMzQQDFM6df+7fz8vqioMaImWb zH6q4pY5Hs9xyeDiwuEW+2/yGFensTka42tldsB4SRqZKCKex74urxhMLU16Gcbra95R esUMxarN0ADWtm9TGlCKbb0cna6R365k92hY0hYeOPox9f41mkIF84OugPDG0jpHLyKy LObXTCiQWutWheseApXLQ6gNpOfgV1LGq+3GV0YiKV951Ij23tA8GX/Uq36lQ2r5v9fF ELAA== MIME-Version: 1.0 Received: by 10.68.240.135 with SMTP id wa7mr7587530pbc.7.1332305725240; Tue, 20 Mar 2012 21:55:25 -0700 (PDT) Sender: adrian.chadd@gmail.com Received: by 10.143.33.5 with HTTP; Tue, 20 Mar 2012 21:55:25 -0700 (PDT) In-Reply-To: References: <20120312181921.GF75778@deviant.kiev.zoral.com.ua> <20120315112959.GP75778@deviant.kiev.zoral.com.ua> Date: Tue, 20 Mar 2012 21:55:25 -0700 X-Google-Sender-Auth: pMIFPh03rezHvH86CmXFKIRTfMc Message-ID: From: Adrian Chadd To: Svatopluk Kraus Content-Type: text/plain; charset=ISO-8859-1 Cc: Konstantin Belousov , hackers@freebsd.org Subject: Re: [vfs] buf_daemon() slows down write() severely on low-speed CPU X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 21 Mar 2012 04:55:25 -0000 Hi, I'm interested in this, primarily because I'm tinkering with file storage stuff on my little (most wifi targetted) embedded MIPS platforms. So what's the story here? How can I reproduce your issue and do some of my own profiling/investigation? Adrian