26 Feb
2001
26 Feb
'01
6:47 p.m.
On Mon, 26 Feb 2001, Ken Wellsch wrote:
I took a quick look at this this morning and as Roger says, the kernel
is built with a wired in swap. In the case of the kernel 'rkunix,' in
looking at usr/sys/run or something like that, I see they are wiring
the swap to be device major=0 and minor=0 which is the root RK05 drive.
Looking at the code it seems the first 4000 blocks are file system and
a following 782 (or something like that) are for swap.
The "ps" command source appears to be poking around /dev looking for a
block device that matches the kernel value for swapdev (or something like
that) and confirming it is a block device.
Yet I see I have /dev/rk0 mknod'ed 0/0 and it is a block device but "ps"
still gripes about "no swap device."
So I'm missing something I guess.
-- Ken
____________________________________________________________________
Robin Birch robin(a)ruffnready.co.uk
M1ASU/2E0ARJ/M5ABD Old computers and radios always welcome
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Yet I see I have /dev/rk0 mknod'ed 0/0 and it is a block device but "ps"
still gripes about "no swap device."
So I'm missing something I guess.
Based on my recent experience with Ultrix-11 (which warns you not
to try and change the partiitioning on certain drive types as the
kernel has some references hard-coded) what you may be missing are
the devices for the individual partitions. Is there an equivalent
to MAKEDEV?? Ultrix uses a program named "msf" (for "make special
file") and so you never see what the partitioning layout is unless
you peek at the sources.
Good luck.
bill
--
Bill Gunshannon | de-moc-ra-cy (di mok' ra see) n. Three wolves
bill(a)cs.scranton.edu | and a sheep voting on what's for dinner.
University of Scranton |
Scranton, Pennsylvania | #include <std.disclaimer.h>
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From Ian King <iking(a)microsoft.com> Tue Feb 27
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From: Ian King <iking(a)microsoft.com>
To: "'Ken Wellsch'" <kwellsch(a)tampabay.rr.com>om>, Roger Ivie
<IVIE(a)cc.usu.edu>
Cc: PUPS(a)minnie.cs.adfa.edu.au
Subject: RE: [pups] Swap device in V6?
Date: Mon, 26 Feb 2001 10:27:12 -0800
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I, too, have /dev/rk0 mknod'ed as 0,0. Relaetd to this, ps does something
odd (at least to my experience) with the open() system call - it calls 'open
("/dev")', without a second argument for mode; that seems like a no-no in
C,
but for C of this era I'm not sure. That call seems to succeed; it's a few
statements later where it fails with the "no swap device" console message.
But where cc seems to be failing (in /lib/c0), it is doing a fork(),
execve() and wait(), and if the system needs to swap to do that, not being
able to find swap space would sure bugger things up.
I'll examine my /dev/rk0 structure next.... -- Ian
-----Original Message-----
From: Ken Wellsch [mailto:kwellsch@tampabay.rr.com]
Sent: Monday, February 26, 2001 9:52 AM
To: Roger Ivie
Cc: PUPS(a)minnie.cs.adfa.edu.au
Subject: Re: [pups] Swap device in V6?
Roger Ivie wrote:
Ian King said:
I took a quick look at this this morning and as Roger says, the kernel
is built with a wired in swap. In the case of the kernel 'rkunix,' in
looking at usr/sys/run or something like that, I see they are wiring
the swap to be device major=0 and minor=0 which is the root RK05 drive.
Looking at the code it seems the first 4000 blocks are file system and
a following 782 (or something like that) are for swap.
The "ps" command source appears to be poking around /dev looking for a
block device that matches the kernel value for swapdev (or something like
that) and confirming it is a block device.
Yet I see I have /dev/rk0 mknod'ed 0/0 and it is a block device but "ps"
still gripes about "no swap device."
So I'm missing something I guess.
-- Ken
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I've combed the docs and the code, and I
can't find ANYthing about how =
swap space is assigned or designated. Does anyone have any hints? =
Thanks -- Ian=20
Yeah, I figured this out a while ago. Unfortunately, I'm in the middle
of changing employers so everything's in boxes at the moment.
Basically, the swap space is hard-coded into the device drivers. If you
take a look at, for example, the RK05 driver you'll see that one of the
drives is smaller than the others. That extra space is the swap space.
I forget how the rest of the system is informed of the swap space, but
it's done in the disk driver sources IIRC. From Ken Wellsch [mailto:kwellsch@tampabay.rr.com] Tue
Feb 27 04:04:53 2001
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From: Roger Ivie <IVIE(a)cc.usu.edu>
Subject: Re: [pups] Swap device in V6?
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Ian King wrote:
But where cc seems to be failing (in /lib/c0), it is
doing a fork(),
execve() and wait(), and if the system needs to swap to do that, not being
able to find swap space would sure bugger things up.
It is indeed the case that V6 needs swap to fork. Forking in V6 is done
essentially by swapping the task out to disk and (oops!) forgetting to
delete the in-core copy. At least, that's how it looked to me.
Roger Ivie
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From Ian King <iking(a)microsoft.com> Tue Feb 27
05:06:07 2001
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From: Ian King <iking(a)microsoft.com>
To: "'Steven M. Schultz'" <sms(a)moe.2bsd.com>om>,
pups(a)minnie.cs.adfa.edu.au
Subject: Serial settings (was RE: [pups] 2.11BSD boot hangs.)
Date: Mon, 26 Feb 2001 11:06:07 -0800
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FWIW, I noticed that Unix V6 is happier with 7E1 for its console, too; I'm
using a terminal emulator, and was getting garbage from V6 (but had had no
problems with RSX-11). -- Ian
-----Original Message-----
From: Steven M. Schultz [mailto:sms@moe.2bsd.com]
Sent: Monday, February 26, 2001 10:22 AM
To: pups(a)minnie.cs.adfa.edu.au
Subject: Re: [pups] 2.11BSD boot hangs.
[snip]
BTW: What serial parameters does 2.11BSD use? The
first time I booted
UNIX I got garbage after "user mem = 307200". I seted the vt220 to 7e1
and this worked, but is it correct?
Yes, 7e1 is correct - a legacy setting from eons ago.
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From "Fred N. van Kempen"
<Fred.van.Kempen(a)microwalt.nl> Tue Feb 27 05:41:07 2001
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From: "Fred N. van Kempen" <Fred.van.Kempen(a)microwalt.nl>
To: "PUPS Mailing List (E-mail)" <pups(a)minnie.cs.adfa.edu.au>
Subject: [pups] Ultrix-11 V3.1 hang on DEQNA ?
Date: Mon, 26 Feb 2001 20:41:07 +0100
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All,
I'm almost there. If only I can tell my 11/23+ _not_ to hang as soon
as I enable networking by configuring the Ethernet (qe0; DEQNA) card
with ifconfig.
Does anyone have docs regarding the DEQNA and/or DELQA so I can check the
board's physical settings?
Thx,
Fted
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From Robin Birch <robin(a)ruffnready.co.uk> Tue Feb
27 06:17:18 2001
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Date: Mon, 26 Feb 2001 20:17:18 +0000
To: Ian King <iking(a)microsoft.com>
Cc: "'Ken Wellsch'" <kwellsch(a)tampabay.rr.com>om>, Roger Ivie
<IVIE(a)cc.usu.edu>du>,
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From: Robin Birch <robin(a)ruffnready.co.uk>
Subject: Re: [pups] Swap device in V6?
References:
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In later unixes, 2.11 for instance, /dev/swap is a link to the swap
device. Is ps attempting to open /dev/swap and finding that it either
isn't there or it is mknoded to an incorrect device?
Robin
In message <8D25F244B8274141B5D313CA4823F39C0235D1C9(a)red-msg-06.redmondond.
corp.microsoft.com>, Ian King <iking(a)microsoft.com> writes
I, too, have /dev/rk0 mknod'ed as 0,0. Relaetd to
this, ps does something
odd (at least to my experience) with the open() system call - it calls 'open
("/dev")', without a second argument for mode; that seems like a no-no in
C,
but for C of this era I'm not sure. That call seems to succeed; it's a few
statements later where it fails with the "no swap device" console message.
But where cc seems to be failing (in /lib/c0), it is doing a fork(),
execve() and wait(), and if the system needs to swap to do that, not being
able to find swap space would sure bugger things up.
I'll examine my /dev/rk0 structure next.... -- Ian
-----Original Message-----
From: Ken Wellsch [mailto:kwellsch@tampabay.rr.com]
Sent: Monday, February 26, 2001 9:52 AM
To: Roger Ivie
Cc: PUPS(a)minnie.cs.adfa.edu.au
Subject: Re: [pups] Swap device in V6?
Roger Ivie wrote:
____________________________________________________________________
Robin Birch robin(a)ruffnready.co.uk
M1ASU/2E0ARJ/M5ABD Old computers and radios always welcome
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Ian King said:
I took a quick look at this this morning and as Roger says, the kernel
is built with a wired in swap. In the case of the kernel 'rkunix,' in
looking at usr/sys/run or something like that, I see they are wiring
the swap to be device major=0 and minor=0 which is the root RK05 drive.
Looking at the code it seems the first 4000 blocks are file system and
a following 782 (or something like that) are for swap.
The "ps" command source appears to be poking around /dev looking for a
block device that matches the kernel value for swapdev (or something like
that) and confirming it is a block device.
Yet I see I have /dev/rk0 mknod'ed 0/0 and it is a block device but "ps"
still gripes about "no swap device."
So I'm missing something I guess.
-- Ken I've combed the docs and the code, and I
can't find ANYthing about how =
swap space is assigned or designated. Does anyone have any hints? =
Thanks -- Ian=20
Yeah, I figured this out a while ago. Unfortunately, I'm in the middle
of changing employers so everything's in boxes at the moment.
Basically, the swap space is hard-coded into the device drivers. If you
take a look at, for example, the RK05 driver you'll see that one of the
drives is smaller than the others. That extra space is the swap space.
I forget how the rest of the system is informed of the swap space, but
it's done in the disk driver sources IIRC. From Ken Wellsch <kwellsch(a)tampabay.rr.com> Tue
Feb 27 06:22:35 2001
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Subject: Re: [pups] Swap device in V6?
References:
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I know I for one had forgotten just what "the state of the art" was with
UNIX back in 1975. If you can, please do look at the source for V6/ps.
Really. /dev/swap? In your dreams! B^) Cheers, -- Ken
Robin Birch wrote:
In later unixes, 2.11 for instance, /dev/swap is a link to the swap
device. Is ps attempting to open /dev/swap and finding that it either
isn't there or it is mknoded to an incorrect device?
Robin
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From Ian King <iking(a)microsoft.com> Tue Feb 27
06:29:48 2001
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From: Ian King <iking(a)microsoft.com>
To: "'Robin Birch'" <robin(a)ruffnready.co.uk>
Cc: "'Ken Wellsch'" <kwellsch(a)tampabay.rr.com>om>, Roger Ivie
<IVIE(a)cc.usu.edu>du>,
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Subject: RE: [pups] Swap device in V6?
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I was wondering about that, as I've seen that sort of thing in other *nixes,
too. I tried creating a link to /dev/swap from /dev/rk0, and it didn't help
ps (same error message).
I'm going to figure out some way to print out ps.c later and trace through
it; I was going through it with ed on the PDP-11 (which was fun, in a
twisted, nostalgic sort of way). If I can figure out exactly how it's
looking for what it's looking for, perhaps I can figure out why it isn't
finding it. :-)
I've found the stuff on coming up in single-user mode, too - with 173030 in
the switch register (I have the programmer's panel on my 11/34a). FYI. --
Ian
-----Original Message-----
From: Robin Birch [mailto:robin@ruffnready.co.uk]
Sent: Monday, February 26, 2001 12:17 PM
To: Ian King
Cc: 'Ken Wellsch'; Roger Ivie; PUPS(a)minnie.cs.adfa.edu.au
Subject: Re: [pups] Swap device in V6?
In later unixes, 2.11 for instance, /dev/swap is a link to the swap
device. Is ps attempting to open /dev/swap and finding that it either
isn't there or it is mknoded to an incorrect device?
Robin
In message <8D25F244B8274141B5D313CA4823F39C0235D1C9(a)red-msg-06.redmondond.
corp.microsoft.com>, Ian King <iking(a)microsoft.com> writes
I, too, have /dev/rk0 mknod'ed as 0,0. Relaetd to
this, ps does something
odd (at least to my experience) with the open() system call - it calls
'open
("/dev")', without a second argument for
mode; that seems like a no-no in
C,
but for C of this era I'm not sure. That call
seems to succeed; it's a few
statements later where it fails with the "no swap device" console message.
But where cc seems to be failing (in /lib/c0), it is doing a fork(),
execve() and wait(), and if the system needs to swap to do that, not being
able to find swap space would sure bugger things up.
I'll examine my /dev/rk0 structure next.... -- Ian
-----Original Message-----
From: Ken Wellsch [mailto:kwellsch@tampabay.rr.com]
Sent: Monday, February 26, 2001 9:52 AM
To: Roger Ivie
Cc: PUPS(a)minnie.cs.adfa.edu.au
Subject: Re: [pups] Swap device in V6?
Roger Ivie wrote:
>
> Ian King said:
> > I've combed the docs and the code, and I can't find ANYthing about how
=
swap space is assigned or designated. Does anyone
have any hints? =
Thanks -- Ian=20
Yeah, I figured this out a while ago. Unfortunately, I'm in the middle
of changing employers so everything's in boxes at the moment.
Basically, the swap space is hard-coded into the device drivers. If you
take a look at, for example, the RK05 driver you'll see that one of the
drives is smaller than the others. That extra space is the swap space.
I forget how the rest of the system is informed of the swap space, but
it's done in the disk driver sources IIRC. From "Fred N. van Kempen"
<Fred.van.Kempen(a)microwalt.nl> Tue Feb 27 07:01:36 2001
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From: "Fred N. van Kempen" <Fred.van.Kempen(a)microwalt.nl>
To: "'Robin Birch'" <robin(a)ruffnready.co.uk>uk>, Ian King
<iking(a)microsoft.com>
Cc: "'Ken Wellsch'" <kwellsch(a)tampabay.rr.com>om>, Roger Ivie
<IVIE(a)cc.usu.edu>du>,
PUPS(a)minnie.cs.adfa.edu.au
Subject: RE: [pups] Swap device in V6?
Date: Mon, 26 Feb 2001 22:01:36 +0100
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In later unixes, 2.11 for instance, /dev/swap is a
link to the swap
device. Is ps attempting to open /dev/swap and finding that it either
isn't there or it is mknoded to an incorrect device?
That is often the case..
dunno about V6 though.. is a long time ago :)
--f
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Bill Gunshannon