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Date:      Mon, 6 Mar 1995 09:02:49 -0800
From:      "Russell L. Carter" <rcarter@geli.com>
To:        se@MI.Uni-Koeln.DE
Cc:        current@FreeBSD.org
Subject:   More on ncr scsi performance
Message-ID:  <199503061702.JAA21908@geli.clusternet>

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Hi Stefan,
I am still having 50% performance slowdowns on my ncr connected drive.
Besides the well known chatter problem, there
also appears to be a throughput problem with the driver or scsi system.  But others,
notably David Greenman, are not seeing this.  I think he is using the buslogic
card.  I haven't been able to run more benchmarks because trying to build the world Sunday
failed after 11 hours!  This used to complete in five.

Last night's build failed (after 2 hours, thank god) with:

cc -fpic -DPIC -O2 -m486 -pipe -DLIBC_RCS -DSYSLIBC_RCS -D__DBINTERFACE_PRIVATE -DPOSIX_MISTAKE -I/usr/src/lib/libc/locale -DYP -c /usr/src/lib/libc/i386/sys/i386_set_ldt.c -o i386_set_ldt.so
building shared c library (version 2.0)
swab.so: Definition of symbol `_swab' (multiply defined)
swab.so: Definition of symbol `_swab' (multiply defined)
*** Error code 1

Stop.
*** Error code 1

Here's /dev/sd0e on a 030495 system, and the bonnie:

33001 files, 551347 used, 339568 free (28000 frags, 38946 blocks, 3.1% fragmentation)

Machine    MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU  /sec %CPU
030495    100  2275 81.1  2294 24.9  1450 25.7  2552 82.3  3807 43.8  65.6  7.2

Here's /dev/sd0e on a 021095 system, and the bonnie:

27098 files, 480655 used, 413680 free (18032 frags, 49456 blocks, 2.0% fragmentation)
Machine    MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU  /sec %CPU
021095    100  3145 96.0  3832 30.9  1630 21.0  3230 95.2  4231 36.8  81.0  7.0

The 030495 system is quite a bit better than a few days earlier.  The
disk fragmentation then was about 2.5%.  Really, it was.

System:  ASUS P54SP4, ncr, 32MB, IBM 0662.

As an aside, I am also sure that the slight delays in interactive response
are real, I can tell by comparing the two systems (I have two P5-90s configured
identically, running these two systems).  Doesn't seem to cause any problems.

As another aside, I haven't had any more of the ominous looking messages:

Mar  6 02:00:04 zoyd /kernel: sd0(ncr0:1:0): COMMAND FAILED (4 28) @f0992a00.
Mar  6 02:00:04 zoyd /kernel: sd0(ncr0:1:0): NOT READY asc:04 ascq:01, retries:4
Mar  6 02:00:04 zoyd last message repeated 2 times

in recent systems.

Cheers,
Russell



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