Date: Mon, 15 Oct 2001 10:31:48 -0700 (PDT) From: Matthew Jacob <mjacob@feral.com> To: Jay Rossiter <jrossiter@symantec.com> Cc: Mikko Tyolajarvi <mikko@dynas.se>, <hackers@FreeBSD.ORG> Subject: Re: Severe I/O Problems Message-ID: <20011015103122.F29828-100000@wonky.feral.com> In-Reply-To: <OF98FD541F.B0641C28-ON88256AE6.005E9596@symantec.com>
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Well- that's good to know. WC helps you overall. That was my one idea. On Mon, 15 Oct 2001, Jay Rossiter wrote: > > dmesg: > atapci0: <Intel ICH2 ATA100 controller> port 0xffa0-0xffaf at device 31.1 > on pci0 > ata0: at 0x1f0 irq 14 on atapci0 > ata1: at 0x170 irq 15 on atapci0 > ad0: 38146MB <Maxtor 5T040H4> [77504/16/63] at ata0-master UDMA100 > acd0: DVD-ROM <SAMSUNG DVD-ROM SD-612> at ata1-master using PIO4 > > sysctl: > hw.ata.ata_dma: 1 > hw.ata.wc: 0 > hw.ata.tags: 0 > hw.ata.atapi_dma: 0 > hw.atamodes: dma,---,pio,---, > > mount: > /dev/ad0s1a on / (ufs, local) > /dev/ad0s1d on /home (ufs, local) > /dev/ad0s1f on /usr (ufs, local) > /dev/ad0s1h on /usr/ports (ufs, asynchronous, local) > /dev/ad0s1g on /usr/src (ufs, asynchronous, local) > /dev/ad0s1e on /var (ufs, local) > > All of the data work for this project is taking place on /home > > > The writecache flag appeared as though it was going to help significantly, > however the total run took about five hours longer than previous. (~21 > hours) > > Start: Fri Oct 12 15:16:35 PDT 2001 > Stop: Sat Oct 13 12:28:40 PDT 2001 > > > > > > > > > Mikko > Tyolajarvi To: jrossiter@symantec.com > <mikko@dynas.s cc: hackers@freebsd.org > e> Subject: Re: Severe I/O Problems > > 10/12/2001 > 05:25 PM > > > > > > > In local.freebsd.hackers you write: > > >There appear to be a lot of changes that went into the filesystem and I/O > >code between 4.3 and 4.4. A little over a week ago I upgraded my 4.3 box > >to 4.4-STABLE and immediately I started having I/O slowdown. I do > >development and QA on a program that is very I/O bound, but the changes > >between 4.3 and 4.4 aren't small enough that I can ignore them. > > >A few statistics: > > >BSD, P4 1.4GHz, ATA100 drives > >- Normal test run on 4.3 was taking ~3 hours. > >- Normal test run on 4.4 is taking 15-16 hours. > > >P3-800, ATA66 drives, SuSE Linux 7.1: > >- Normal test run takes ~4.5 hours. > > >UltraSparc 10, Solaris 8, ATA66 drives: > >- Normal test run takes ~6 hours. > > >As you can see, this jump was just phenomenal. > > Yup, sure looks bad. Post output from at least: > > % dmesg | grep ata > % sysctl -a | grep ata > % mount | grep ufs > > to give people something more to go on. > > $.02, > /Mikko > -- > Mikko > Työläjärvi_______________________________________mikko@rsasecurity.com > RSA Security > > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-hackers" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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