From owner-freebsd-bugs Sat May 19 8: 3:31 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 7582237B422 for ; Sat, 19 May 2001 08:03:17 -0700 (PDT) (envelope-from sos@freebsd.dk) Received: (from sos@localhost) by freebsd.dk (8.11.3/8.11.3) id f4JF35V49854; Sat, 19 May 2001 17:03:05 +0200 (CEST) (envelope-from sos) From: Søren Schmidt Message-Id: <200105191503.f4JF35V49854@freebsd.dk> Subject: Re: ATA driver on 4.3 is too slow In-Reply-To: <01051921510901.04398@sentry.granch.com> "from Rashid N. Achilov at May 19, 2001 09:51:09 pm" To: achilov@granch.ru Date: Sat, 19 May 2001 17:02:20 +0200 (CEST) Cc: 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 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. -Søren To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message