Date: Sat, 18 Apr 1998 16:43:31 -0400 From: Mark Mayo <mark@vmunix.com> To: Mike Smith <mike@smith.net.au> Cc: stable@FreeBSD.ORG, hardware@FreeBSD.ORG Subject: Re: best wdc0 flags ? Message-ID: <19980418164331.08912@vmunix.com> In-Reply-To: <199804181645.JAA04953@antipodes.cdrom.com>; from Mike Smith on Sat, Apr 18, 1998 at 09:45:53AM -0700 References: <19980418023307.34709@vmunix.com> <199804181645.JAA04953@antipodes.cdrom.com>
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On Sat, Apr 18, 1998 at 09:45:53AM -0700, Mike Smith wrote:
> > Hi. I just put a shiney new IDE (Ultra33) drive in a machine, and
> > I'm wondering what the best flags to use for the drive are.. I realize
> > that I can't get DMA on -STABLE (cvsupping right now), but with the
> > default LINT flags of:
[SNIP]
> We've been duplicating 3GB Western Digital disks the last few days under
> 2.2.6, flags 0x80ff80ff on 166MHz P5/430TX boards, and averaging about
> 5M/sec throughput. Try 'dd if=/dev/wd1 of=/dev/null bs=1m' to get an
> idea of your raw disk speed as opposed to filesystem throughput.
First, relavent dmesg output:
FreeBSD 2.2.6-STABLE #0: Sat Apr 18 15:50:05 EDT 1998
CPU: Pentium (167.07-MHz 586-class CPU)
real memory = 67108864 (65536K bytes)
chip0 <Intel 82439TX PCI cache memory controller> rev 1 on pci0:0:0
chip2 <Intel 82371AB IDE interface> rev 1 on pci0:7:1
wdc0 at 0x1f0-0x1f7 irq 14 flags 0x80ff80ff on isa
wdc0: unit 0 (wd0): <QUANTUM FIREBALL SE4.3A>, 32-bit, multi-block-16
wd0: 4110MB (8418816 sectors), 14848 cyls, 9 heads, 63 S/T, 512 B/S
Now the mega-crappy performance I'm still getting:
vnode:{77}~ % dd if=/dev/wd0 of=/dev/null bs=1m
^C76+0 records in
76+0 records out
79691776 bytes transferred in 36.231349 secs (2199525 bytes/sec)
vnode:{83}~ % iozone 165 17000
...
IOZONE performance measurements:
2438356 bytes/second for writing the file
3048197 bytes/second for reading the file
Hmmrf. I'm sure the 3.0 read was just due to caching.. (64MB of pretty much
unused RAM).
vnode:{86}~ % bonnie -s 200
File './Bonnie.323', size: 209715200
Writing with putc()...done
Rewriting...done
Writing intelligently...done
Reading with getc()...done
Reading intelligently...done
Seeker 1...Seeker 2...Seeker 3...start 'em...done...done...done...
-------Sequential Output-------- ---Sequential Input-- --Random--
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
200 1833 36.3 2384 17.4 1168 5.3 2097 31.4 2406 6.4 73.5 4.6
Man, either this drive really sucks, or something weird is going on! :-)
The motherboard is the highly recomended Abit, DIMM RAM, etc.. STREAM
is still showing memory throughput over 100MB/s, so that's working fine,
and the old 1GB SCSI disk in the system is still pumping out about 4MB/s
with the above tests..
If anyone has any ideas why the latest greatest IDE drive from Quantum is
blowing chunks all over my I/O, give me a shout! :-)
-Mark
>
> --
> \\ Sometimes you're ahead, \\ Mike Smith
> \\ sometimes you're behind. \\ mike@smith.net.au
> \\ The race is long, and in the \\ msmith@freebsd.org
> \\ end it's only with yourself. \\ msmith@cdrom.com
>
--
------------------------------------------------------------------------
Mark Mayo mark@vmunix.com
RingZero Comp. http://www.vmunix.com/mark
finger mark@vmunix.com for my PGP key and GCS code
------------------------------------------------------------------------
"The problem is how do you build tools that understand your programs
at a deeper semantic level." - James Gosling
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