Date: Thu, 22 Aug 1996 08:50:50 -0400 (EDT) From: Glen Foster <gfoster@gfoster.com> To: freebsd-hardware@FreeBSD.ORG Subject: Re: SCSI again: Asus SC200 vs. Adaptec 2940 ... Message-ID: <199608221250.IAA02195@tbd.gfoster.com> In-Reply-To: <199608220336.AA169064976@hpnmhjw.sr.hp.com> (message from Darryl Okahata on Wed, 21 Aug 1996 20:36:15 -0700)
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A couple of data points with Adaptec 2940s:
***** Bonnie:
-------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
P166 100 1414 23.8 1356 5.1 700 4.3 1736 27.5 2081 7.7 42.7 1.9
***** IOZONE:
Writing the 128 Megabyte file, 'iozone.tmp'...96.320312 seconds
Reading the file...66.140625 seconds
IOZONE performance measurements:
1393451 bytes/second for writing the file
2029278 bytes/second for reading the file
Machine is a P166, with 64MB 60ns parity DRAM, ASUS P55T2P4 w/256K PB
cache, a 1GB Fujitsu M2266S-512 002C, and an Adaptec 2940 SCSI
controller running 2.1.5R. Disk was about 3/4 full at start of test.
This drive is an older 5 1/4" 3600 RPM drive that is not doing
syncronous transfers, if I get a wild hair I'll flop some jumpers and
see if sync xfers can be enabled.
***** Bonnie:
-------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
P100 100 2056 51.4 4226 19.3 1609 12.9 2076 50.7 4291 19.7 72.1 3.9
***** IOZONE:
Writing the 256 Megabyte file, 'iozone.tmp'...96.984375 seconds
Reading the file...63.914062 seconds
IOZONE performance measurements:
2767821 bytes/second for writing the file
4199943 bytes/second for reading the file
Machine is a P100, with 32MB 70ns non-parity DRAM, unknown MB w/256K
PB cache, a 2GB Seagate ST32430N 0300, and an Adaptec 2940 running
2.1.5R. Disk was about 1/2 full at start of test.
Without trying to get too deep into the numbers, I think one could say
that one's money is more effectively spent on disk, RAM, and CPU than
on a "better" SCSI controller.
>Date: Wed, 21 Aug 1996 20:36:15 -0700
>From: Darryl Okahata <darrylo@hpnmhjw.sr.hp.com>
>
>> How do these two boards actually compare? Disregarding drivers
>> are they fairly similar in capability and speed?
>
> The NCR driver is quite nice. It's certainly hard to go wrong for
>the money. Here are some benchmarks, using an NCR815-based controller:
>
>-------------------------------------------------------------------------------
>***** Bonnie:
> -------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
>PCI/Q4.0 256 3350 66.8 3387 14.8 2027 15.9 4671 90.0 6065 24.6 87.5 4.1
>
>***** IOZONE:
>$ time iozone 256
>
>Writing the 256 Megabyte file, 'iozone.tmp'...77.492188 seconds
>Reading the file...43.460938 seconds
>
>IOZONE performance measurements:
> 3464032 bytes/second for writing the file
> 6176476 bytes/second for reading the file
>-------------------------------------------------------------------------------
>
>This is on a P133, with 64MB 60ns parity FPM DRAM, ASUS P55T2P4 w/512K
>PB cache, a 4GB Quantum Atlas (34300S), and a DTC 3130B SCSI controller.
>Note that these measurements were *NOT* done on the outer tracks of the
>drive; the drive was half-full when these benchmarks were done, and so
>I'd guess that they were done around the tracks 1/3 of the way in.
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