Date: Mon, 15 Oct 2001 10:21:35 -0700 From: "Jay Rossiter" <jrossiter@symantec.com> To: Mikko Tyolajarvi <mikko@dynas.se> Cc: hackers@freebsd.org Subject: Re: Severe I/O Problems Message-ID: <OF98FD541F.B0641C28-ON88256AE6.005E9596@symantec.com>
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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 significant=
ly,
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
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Mikko =
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Tyolajarvi To: jrossiter@symantec.com=
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e> Subject: Re: Severe I/O Pr=
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10/12/2001 =
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05:25 PM =
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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 change=
s
>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
Ty=F6l=E4j=E4rvi_______________________________________mikko@rsasecurit=
y.com
RSA Security
=
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