Date: Sat, 19 May 2001 19:41:52 +0200 (CEST) From: Søren Schmidt <sos@freebsd.dk> To: Brian Somers <brian@Awfulhak.org> Cc: achilov@granch.ru, valgog@biofrontera.de, freebsd-bugs@FreeBSD.ORG Subject: Re: ATA driver on 4.3 is too slow Message-ID: <200105191741.f4JHfqs89577@freebsd.dk> In-Reply-To: <200105191717.f4JHHbb31761@hak.lan.Awfulhak.org> "from Brian Somers at May 19, 2001 06:17:37 pm"
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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
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