From owner-freebsd-bugs Sat May 19 10:42: 4 2001 Delivered-To: freebsd-bugs@freebsd.org Received: from freebsd.dk (fw-rl0.freebsd.dk [212.242.86.114]) by hub.freebsd.org (Postfix) with ESMTP id 2A6C637B43C for ; Sat, 19 May 2001 10:42:00 -0700 (PDT) (envelope-from sos@freebsd.dk) Received: (from sos@localhost) by freebsd.dk (8.11.3/8.11.3) id f4JHfqs89577; Sat, 19 May 2001 19:41:52 +0200 (CEST) (envelope-from sos) From: Søren Schmidt Message-Id: <200105191741.f4JHfqs89577@freebsd.dk> Subject: Re: ATA driver on 4.3 is too slow In-Reply-To: <200105191717.f4JHHbb31761@hak.lan.Awfulhak.org> "from Brian Somers at May 19, 2001 06:17:37 pm" To: Brian Somers Date: Sat, 19 May 2001 19:41:52 +0200 (CEST) Cc: achilov@granch.ru, valgog@biofrontera.de, freebsd-bugs@FreeBSD.ORG X-Mailer: ELM [version 2.4ME+ PL88 (25)] MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=ISO-8859-1 Sender: owner-freebsd-bugs@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org It seems Brian Somers wrote: > > It seems Rashid N. Achilov wrote: > > > On Thursday 17 May 2001 18:33, S?ren Schmidt wrote: > > > > It seems valgog@biofrontera.de wrote: > > > > > > > > Most of the impact is due to FreeBSD now shipping with Write Caching > > > > off as default (see man ata for details), that will hurt even if > > > > you run with softupdates. If you dont care about possible dataloss > > > > at power failures you can enable WC and get your performance back... > > > > > > sysctl -w hw.ata.wc=1 > > > sysctl: oid 'hw.ata.wc' is read only > > > > Does that mean it still performs badly ? you give no info here... > > > > If so, its hardly the ATA driver thats the problem, you could try > > that by doing a 'dd if=/dev/ad0 of=/dev/null bs=1m count=1000' > > and see if the transfer rate is what the drive can deliver. If > > so you have to look somewhere other than the ATA subsystem. > > I think he's saying that he can't change the sysctl to 1. man ata, its a tuneable, and can only be set in loader.conf, it can _not_ be changed at run time... > I can confirm that I get the same poor performance. I can give you > an account on the box if you're interested. It's running -current: -Søren To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message