Re: Performance degradation over time on VAX...

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[Apologies for reposting this - I've lost my old pure ascii e-mail service
and this option sucks as expected]

> From: [email protected] <[email protected]> on behalf of
Johnny Billquist <[email protected]>
> Sent: Wednesday, April 29, 2026 10:42 AM
> To: [email protected]
> 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)

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<div dir=3D"ltr">[Apologies for reposting this - I&#39;ve lost my old pure =
ascii e-mail service and this option sucks as expected]<br><br>&gt; From: p=
[email protected] &lt;[email protected]&gt; on behalf of Joh=
nny Billquist &lt;<a href=3D"mailto:[email protected]">[email protected]</a>&gt;<=
br>&gt; Sent: Wednesday, April 29, 2026 10:42 AM<br>&gt; To: <a href=3D"mai=
lto:[email protected]">[email protected]</a><br>&gt; Subject: Performan=
ce degradation over time on VAX...<br>&gt;<br>&gt; ...<br>&gt;<br>&gt; Anyw=
ay - this is perhaps food for thought for someone who is interested<br>&gt;=
 in digging into it more. If I have plenty of time, I might dig more, but<b=
r>&gt; I&#39;m sortof busy with other things as well. :)<br>&gt;<br>&gt; =
=C2=A0 =C2=A0Johnny<br><br>A little late, but I took the challenge and I di=
d some tests that I hope follow what you have done.<br><br>Here are the res=
ults, FWIW...<br><br>My simh 3.12-5 boot config I used with the ISOs.=C2=A0=
 All testing done using the same host system.<br><br>----------------------=
-------------------------------<br><br>set cpu 128m<br><br>set cpu SIMHALT<=
br>set cpu idle=3DNETBSD<br><br>attach nvr ./nvram.bin<br><br>set rq0 RAUSE=
R=3D1024<br>att rq0 RA1G.0.dsk<br><br>set rq1 disabled<br><br>set rq2 cdrom=
<br>att rq2 /home/sim312/vax/iso/LEGACY/{vaxcd-*.iso or NetBSD-*.iso}<br><b=
r>set rq3 disabled<br><br>set xq disabled<br><br>set dz lines=3D4<br>set dz=
 7b<br>attach -am dz 1144<br><br>set =C2=A0tq disabled<br>set lpt disabled<=
br>set =C2=A0rl disabled<br>set =C2=A0ts disabled<br><br>boot cpu<br><br>--=
---------------------------------------------------<br>Run on each release =
ISO selecting a shell after booting<br><br>dd if=3D/dev/rra0c of=3D/dev/nul=
l bs=3D1024<br><br>-----------------------------------------------------<br=
><br>2.0.0.txt:1024458752 bytes transferred in 92.210 secs (11110061 bytes/=
sec)<br>2.0.2.txt:1024458752 bytes transferred in 92.630 secs (11059686 byt=
es/sec)<br>2.1.0.txt:1024458752 bytes transferred in 93.000 secs (11015685 =
bytes/sec)<br>3.1.1.txt:1024458752 bytes transferred in 97.490 secs (105083=
47 bytes/sec)<br>4.0.0.txt:1024458752 bytes transferred in 114.550 secs (89=
43332 bytes/sec)<br>4.0.1.txt:1024458752 bytes transferred in 114.230 secs =
(8968386 bytes/sec)<br>5.0.0.txt:1024458752 bytes transferred in 157.420 se=
cs (6507805 bytes/sec)<br>5.0.2.txt:1024458752 bytes transferred in 160.880=
 secs (6367844 bytes/sec)<br>5.1.2.txt:1024458752 bytes transferred in 162.=
350 secs (6310186 bytes/sec)<br>5.1.5.txt:1024458752 bytes transferred in 1=
61.820 secs (6330853 bytes/sec)<br>5.2.3.txt:1024458752 bytes transferred i=
n 158.070 secs (6481044 bytes/sec)<br>6.0.6.txt:1024458752 bytes transferre=
d in 179.890 secs (5694917 bytes/sec)<br>6.1.2.txt:1024458752 bytes transfe=
rred in 176.960 secs (5789210 bytes/sec)<br>6.1.3.txt:1024458752 bytes tran=
sferred in 178.940 secs (5725152 bytes/sec)<br>7.0.0.txt:1024458752 bytes t=
ransferred in 197.520 secs (5186607 bytes/sec)<br>7.1.2.txt:1024458752 byte=
s transferred in 197.030 secs (5199506 bytes/sec)<br>7.2.0.txt:1024458752 b=
ytes transferred in 197.720 secs (5181361 bytes/sec)<br>8.0.0.txt:102445875=
2 bytes transferred in 204.430 secs (5011293 bytes/sec)<br>8.1.0.txt:102445=
8752 bytes transferred in 204.420 secs (5011538 bytes/sec)<br>8.2.0.txt:102=
4458752 bytes transferred in 211.010 secs (4855024 bytes/sec)<br>9.0.0.txt:=
1024458752 bytes transferred in 199.950 secs (5123574 bytes/sec)<br>9.1.0.t=
xt:1024458752 bytes transferred in 201.240 secs (5090731 bytes/sec)<br>9.2.=
0.txt:1024458752 bytes transferred in 204.750 secs (5003461 bytes/sec)<br>9=
.3.0.txt:1024458752 bytes transferred in 201.380 secs (5087192 bytes/sec)<b=
r>10.0..txt:1024458752 bytes transferred in 224.340 secs (4566545 bytes/sec=
)<br>10.1..txt:1024458752 bytes transferred in 223.530 secs (4583092 bytes/=
sec)<br>11rc5.txt:1024458752 bytes transferred in 226.920 secs (4514625 byt=
es/sec)<br><br>-----------------------------------------------------<br>Run=
 on already installed images that had rebuilt themselves from source<br><br=
>dd if=3D/dev/rra0c of=3D/dev/null bs=3D1024 count=3D1000448<br><br>-------=
----------------------------------------------<br><br>1.2.1.txt:1024458752 =
bytes transferred in 64 secs (16007168 bytes/sec)<br>1.3.3.txt:1024458752 b=
ytes transferred in 64 secs (16007168 bytes/sec)<br>1.4.3.txt:1024458752 by=
tes transferred in 63 secs (16261250 bytes/sec)<br>1.5.3.txt:1024458752 byt=
es transferred in 113 secs (9066006 bytes/sec)<br>1.6.2.txt:1024458752 byte=
s transferred in 125.800 secs (8143551 bytes/sec)<br></div>

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