Re: Performance degradation over time on VAX...

[Dave McGuire <mcguire%neurotica.com@localhost>]

  If you need a real email account, I'd be happy to provide one.  I've seen your name around here quite a lot over the years.

                -Dave

On June 22, 2026 16:17:51 Ken Wellsch <kcwellsch%outlook.com@localhost> wrote:
> [Apologies for reposting this - I've lost my old pure ascii e-mail service and this option sucks as expected]
>
>> From: port-vax-owner%NetBSD.org@localhost <port-vax-owner%NetBSD.org@localhost> on behalf of Johnny Billquist <bqt%softjar.se@localhost>
>> Sent: Wednesday, April 29, 2026 10:42 AM
>> To: port-vax%netbsd.org@localhost
>> Subject: Performance degradation over time on VAX...
>>
>> ...
>>
>> Anyway - this is perhaps food for thought for someone who is interested
>> in digging into it more. If I have plenty of time, I might dig more, but
>> I'm sortof busy with other things as well. :)
>>
>> Johnny
>
> A little late, but I took the challenge and I did some tests that I hope follow what you have done.
>
> Here are the results, FWIW...
>
> My simh 3.12-5 boot config I used with the ISOs.  All testing done using the same host system.
>
> -----------------------------------------------------
>
> set cpu 128m
>
> set cpu SIMHALT
> set cpu idle=NETBSD
>
> attach nvr ./nvram.bin
>
> set rq0 RAUSER=1024
> att rq0 RA1G.0.dsk
>
> set rq1 disabled
>
> set rq2 cdrom
> att rq2 /home/sim312/vax/iso/LEGACY/{vaxcd-*.iso or NetBSD-*.iso}
>
> set rq3 disabled
>
> set xq disabled
>
> set dz lines=4
> set dz 7b
> attach -am dz 1144
>
> set  tq disabled
> set lpt disabled
> set  rl disabled
> set  ts disabled
>
> boot cpu
>
> -----------------------------------------------------
> Run on each release ISO selecting a shell after booting
>
> dd if=/dev/rra0c of=/dev/null bs=1024
>
> -----------------------------------------------------
>
> 2.0.0.txt:1024458752 bytes transferred in 92.210 secs (11110061 bytes/sec)
> 2.0.2.txt:1024458752 bytes transferred in 92.630 secs (11059686 bytes/sec)
> 2.1.0.txt:1024458752 bytes transferred in 93.000 secs (11015685 bytes/sec)
> 3.1.1.txt:1024458752 bytes transferred in 97.490 secs (10508347 bytes/sec)
> 4.0.0.txt:1024458752 bytes transferred in 114.550 secs (8943332 bytes/sec)
> 4.0.1.txt:1024458752 bytes transferred in 114.230 secs (8968386 bytes/sec)
> 5.0.0.txt:1024458752 bytes transferred in 157.420 secs (6507805 bytes/sec)
> 5.0.2.txt:1024458752 bytes transferred in 160.880 secs (6367844 bytes/sec)
> 5.1.2.txt:1024458752 bytes transferred in 162.350 secs (6310186 bytes/sec)
> 5.1.5.txt:1024458752 bytes transferred in 161.820 secs (6330853 bytes/sec)
> 5.2.3.txt:1024458752 bytes transferred in 158.070 secs (6481044 bytes/sec)
> 6.0.6.txt:1024458752 bytes transferred in 179.890 secs (5694917 bytes/sec)
> 6.1.2.txt:1024458752 bytes transferred in 176.960 secs (5789210 bytes/sec)
> 6.1.3.txt:1024458752 bytes transferred in 178.940 secs (5725152 bytes/sec)
> 7.0.0.txt:1024458752 bytes transferred in 197.520 secs (5186607 bytes/sec)
> 7.1.2.txt:1024458752 bytes transferred in 197.030 secs (5199506 bytes/sec)
> 7.2.0.txt:1024458752 bytes transferred in 197.720 secs (5181361 bytes/sec)
> 8.0.0.txt:1024458752 bytes transferred in 204.430 secs (5011293 bytes/sec)
> 8.1.0.txt:1024458752 bytes transferred in 204.420 secs (5011538 bytes/sec)
> 8.2.0.txt:1024458752 bytes transferred in 211.010 secs (4855024 bytes/sec)
> 9.0.0.txt:1024458752 bytes transferred in 199.950 secs (5123574 bytes/sec)
> 9.1.0.txt:1024458752 bytes transferred in 201.240 secs (5090731 bytes/sec)
> 9.2.0.txt:1024458752 bytes transferred in 204.750 secs (5003461 bytes/sec)
> 9.3.0.txt:1024458752 bytes transferred in 201.380 secs (5087192 bytes/sec)
> 10.0..txt:1024458752 bytes transferred in 224.340 secs (4566545 bytes/sec)
> 10.1..txt:1024458752 bytes transferred in 223.530 secs (4583092 bytes/sec)
> 11rc5.txt:1024458752 bytes transferred in 226.920 secs (4514625 bytes/sec)
>
> -----------------------------------------------------
> Run on already installed images that had rebuilt themselves from source
>
> dd if=/dev/rra0c of=/dev/null bs=1024 count=1000448
>
> -----------------------------------------------------
>
> 1.2.1.txt:1024458752 bytes transferred in 64 secs (16007168 bytes/sec)
> 1.3.3.txt:1024458752 bytes transferred in 64 secs (16007168 bytes/sec)
> 1.4.3.txt:1024458752 bytes transferred in 63 secs (16261250 bytes/sec)
> 1.5.3.txt:1024458752 bytes transferred in 113 secs (9066006 bytes/sec)
> 1.6.2.txt:1024458752 bytes transferred in 125.800 secs (8143551 bytes/sec)


--
Dave McGuire, AK4HZ
New Kensington, PA