Date: Sat, 19 May 2001 17:02:20 +0200 (CEST) From: Søren Schmidt <sos@freebsd.dk> To: achilov@granch.ru Cc: valgog@biofrontera.de, freebsd-bugs@FreeBSD.ORG Subject: Re: ATA driver on 4.3 is too slow Message-ID: <200105191503.f4JF35V49854@freebsd.dk> In-Reply-To: <01051921510901.04398@sentry.granch.com> "from Rashid N. Achilov at May 19, 2001 09:51:09 pm"
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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
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