Date: Wed, 22 Jul 1998 23:40:48 +0930 From: Matthew Thyer <thyerm@camtech.net.au> To: Christoph Kukulies <kuku@gilberto.physik.RWTH-Aachen.DE> Cc: freebsd-current@freefall.cdrom.com Subject: Re: panic in one year old 3.0-current Message-ID: <35B5F2E8.5818B999@camtech.net.au> References: <199807220830.KAA05011@gilberto.physik.RWTH-Aachen.DE> <35B5D5AE.4801C673@camtech.net.au> <19980722153930.A6043@gil.physik.rwth-aachen.de>
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The attached messages will give you some idea on how recently
NFS has been a major problem.
It is so much better now that I think your should upgrade your
machines to current as of now.
There are still some rumours (not just rumours I think) of the
odd niggling VM bug but overall current is in quite good shape
as of a few hours ago (when I last built the world).
I'm not one to comment on internals I'm just going on daily use
(and abuse) of two current systems which I regularly update.
Ask Peter Wemm for his opinion on the current state of NFS.
I suspect there are still some problems in abnormal situations
(NFS server crash may still be confusing the NFS client).
Christoph Kukulies wrote:
>
> On Wed, Jul 22, 1998 at 09:36:06PM +0930, Matthew Thyer wrote:
> > NFS had lots of problems until quite recently.
>
> Sigh. Tell this a person to whom you always argued "I'm using FreeBSD
> over Linux for it's stability what networking is concerned" :-)
> Maybe things are even worse under Linux.
>
> NFS was indeed involved in my case alse (see below).
>
> >
> > I was restricting my NFS use to the version 2 protocol until very
> > recently.
> >
> > Now it seems to work very well with version 3 on recent current.
> --
> --Chris Christoph P. U. Kukulies kuku@gil.physik.rwth-aachen.de
--
/=====================================================================\
|Work: Matthew.Thyer@dsto.defence.gov.au | Home: thyerm@camtech.net.au|
\=====================================================================/
"If it is true that our Universe has a zero net value for all conserved
quantities, then it may simply be a fluctuation of the vacuum of some
larger space in which our Universe is imbedded. In answer to the
question of why it happened, I offer the modest proposal that our
Universe is simply one of those things which happen from time to time."
E. P. Tryon from "Nature" Vol.246 Dec.14, 1973
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From: "John S. Dyson" <toor@dyson.iquest.net>
Message-Id: <199805311451.JAA01243@dyson.iquest.net>
Subject: Re: jumbo nfs commit comming up soon... (ie: in a few hours)
In-Reply-To: <199805311053.SAA02491@spinner.netplex.com.au> from Peter Wemm at "May 31, 98 06:53:55 pm"
To: peter@netplex.com.au (Peter Wemm)
Date: Sun, 31 May 1998 09:51:05 -0500 (EST)
Cc: current@FreeBSD.ORG
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> I've got a series of large NFS commits coming up shortly. 'cvs diff -u |
> wc -l sys/nfs' is in the order of 6000 lines, so I'll try and break it up
> into smaller components where practical.
>
> This means that while things are in transit, the kernel and/or utilities
> may well not compile. Don't be too suprised if your world falls over if
> you try and build from sources mid-commit. (I have not checked all the
> userland stuff yet, amd in particular).
>
> One of the bigger components is a long -> int32_t change for Alpha and
> other 64 bit support.
>
It is *wonderful* that you are making progress on NFS. That is one of
our major problems, and making progress on that is a major contribution.
A personal thank you!!!
John
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From: "Kenneth D. Merry" <ken@plutotech.com>
Message-Id: <199804211622.KAA23401@panzer.plutotech.com>
Subject: Re: NFS corruption
In-Reply-To: <199804210559.PAA09123@troll.dtir.qld.gov.au> from Stephen McKay at "Apr 21, 98 03:59:47 pm"
To: syssgm@dtir.qld.gov.au (Stephen McKay)
Date: Tue, 21 Apr 1998 10:22:54 -0600 (MDT)
Cc: freebsd-current@FreeBSD.ORG
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Stephen McKay wrote...
> NFS is eating my .depend files during a make world.
I can confirm this, but not from make world. I've got a source
tree here that blows up when I compile over NFS.
> The client is a Compaq Prolinea 486SX33 with 12Mb ram and 2 small SCSI-1
> disks on an Adaptec 1542b. The server is a pentium 133 with 32Mb ram and
> 2 4Gb IBM UW SCSI disks on a FirePort 40 (ncr 875).
>
> The source and objects are on the server and NFS mounted to the client. The
> client mounts src readonly and obj read-write (and async, if that does
> anything under NFS).
I have a similar setup, except the source and objects are in the
same place, and the mount is r/w and not async.
> The client kernel (and userland) is -current from April 19 (April 18 US time),
> and has DIAGNOSTIC set. The server is -current from March 12, just before
> the big VM changes.
In my case, the client is from a week or two ago, and the server
kernel was built from yesterday's sources.
> Memory is short on the client, so paging is brisk. There is plenty of
> swap space free. I don't run CAM or softupdates.
I'm running CAM, I don't think that has anything to do with it.
The client only has 24MB of memory, but it doesn't look like I'm running
into swap at all:
Device 1K-blocks Used Avail Capacity Type
/dev/da0b 122880 0 122752 0% Interleaved
> I ran 'make -j2 buildworld' and several hours later observed unusual error
> messages complaining about garbage in .depend files. Many .depend files
> were affected. Each .depend file was broken similarly. They would start
> normally, then the corruption would start on a page boundary (multiple of
> 0x1000), but *not* extend as far as the next page boundary. The corruption
> was either C source, or C preprocessor output overwriting the normal contents.
Right, I have the same problem. The corruption in the .depend
files starts exactly at 0x1000, and continues on for a while, but not for
a full page.
From what Karl says, John is already aware of the problem. I just
thought I'd confirm your findings...
Ken
--
Kenneth Merry
ken@plutotech.com
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From: "Evan Champion" <evanc@synapse.net>
To: <freebsd-current@FreeBSD.ORG>, "Stephen McKay" <syssgm@dtir.qld.gov.au>
Cc: <syssgm@dtir.qld.gov.au>
Subject: Re: NFS corruption
Date: Tue, 21 Apr 1998 07:46:23 -0400
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>I ran 'make -j2 buildworld' and several hours later observed unusual error
>messages complaining about garbage in .depend files. Many .depend files
>were affected. Each .depend file was broken similarly. They would start
>normally, then the corruption would start on a page boundary (multiple of
>0x1000), but *not* extend as far as the next page boundary. The corruption
>was either C source, or C preprocessor output overwriting the normal
contents.
I have similar results, on 2.2.6-STABLE. I have also in the past seen the
.depend's full of nulls.
The only major difference is that my entire .depend is preprocessor output,
and not just a page-worth.
Mounting with nfsv2 seemed to have fixed that problem, but then I ran in to
dead .nfs* files being left around, which caused grief elsewhere. I haven't
been able to build over NFS since at least March, possibly even January or
February.
Evan
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