gmane.os.netbsd.devel.kernel

4.0.1 i386 wedged

der Mouse — 2013-05-21T18:43:44

I don't know if anyone recalls enough 4.x to say anything useful here,
but if anyone does and cares to comment....

The machine: 4.0.1 i386.  Two CPUs.  (Kernel has MULTIPROCESSOR,
MPBIOS, and APM_NO_IDLE turned on.)

NFS-mount a filesystem with a big (half-terabyte) file in it.  vnconfig
that onto vnd0.  Mount /dev/vnd0d.  Write stuff to it.

Machine locks up.  Responsive to ping, but userland is totally wedged,
doesn't even respond to RETURN on the console.  Break into ddb and do
ps and find pagedaemon is waiting on emergva.  It appears to be
deadlocked against itself; my impression from the stack trace is that
it's trying to page something out and finds itself wanting to page
something in to do so.

Is this a case of "don't do that, then", or should this work and I just
need to track down a bug?

/~\ The ASCII  Mouse
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NetBSD/avr32

Tomas Niño Kehoe — 2013-05-18T04:58:36

Hi all,

I'd like to announce the existence of a NetBSD port to the AVR32 processor
architecture.
This port is being developed in the context of my engineering thesis at the
University of Buenos Aires, Argentina. It is directed by Leandro Santi.

This is my first experience with AVR32. My previous experience with RISC
architectures involves MIPS. Consecuently, the MIPS port was taken as a
staring point into NetBSD. Some parts of the MD code contain MIPS code
snippets -guarded by #ifdef notyet clauses- acting as a
reference. These will be removed in the near future. Multiple MIPS
implementations were studied to be
able to understand the interaction between Machine Dependent code (MD) and
Machine independent code (MI).

The milestone that will mark the end of this thesis is the execution of a
static 32-bit Linux binary, read from an in-memory file system supported by
md.c. Currently, the system is able to mount the filesystem successfully,
yet system call support and Linux compatibilty are currently under
deve

[GSoC 2013] Implement file system flags to scrub data blocks before deletion

Przemysław Sierociński — 2013-05-16T19:34:06

Hello,

I have received some comments on my project proposal, which can be found
https://google-melange.appspot.com/gsoc/proposal/review/google/gsoc2013/psie/1 ,
however it would be great if I could detail more points.

May I ask about your opinion on:
1) What file system(s) besides ffs and ext2fs could be modified to
benefit users,
2) What user space binaries have to be changed?

I am finding figuring out these two a little troubling, as I don't
want to miss anything.
Any other comments/suggestions are also more then welcome.

I am not planning to implement undelete instead, unless it is really wanted.

Mrs. S.P.Zeidler suggested I posted here, yet I started on
tech-security, I apologize and hope discussion won't diverge.

Regards,

Przemyslaw Sierocinski

frozen netbsd-6-rc4

2013-05-13T06:35:43

hello,

I am using netbsd-6-rc4 at a dell 1850. the server works only as router. 
it is connected with an lacp port-channel (4*1gb) to a cisco catalyst 
switch.

sometimes (1/day or more often) the system cpu usage increases to 300 
percent or more. in some cases netbsd is frozen (also the kernel 
debugger), in other cases netbsd continues to a normal work after some 
minutes.

The top command shows the following:

load averages:  0.76,  0.77,  0.58;               up 4+03:49:27       11:31:11
33 processes: 31 sleeping, 2 on CPU
CPU0 states:  6.2% user,  0.0% nice, 18.8% system, 11.2% interrupt, 63.9% idle
CPU1 states:  5.0% user,  0.0% nice, 12.8% system,  3.6% interrupt, 78.6% idle
Memory: 279M Act, 153M Inact, 6036K Wired, 20M Exec, 152M File, 296M Free
Swap: 4506M Total, 4506M Free

   PID USERNAME PRI NICE   SIZE   RES STATE      TIME   WCPU    CPU COMMAND
     0 root       0    0     0K 6928K CPU/1     13:37  0.00%   277% [system]
   464 root      43    0   316M  238M parked/0  21.4H 32.47% 32.47% named

Question about pool(9) sizes

Brian Buhrow — 2013-05-03T21:41:29

Hello.  In my continuing quest to try and get i/o performance up on
some NetBSD-5.1 production boxes I have, I find I have a question about the
minimum and maximum sizes of a specific pool.
Given the following snippet of output from vmstat -m, does the size 164,
which I realize represents the number of objects in the pool, also
represent the maximum  number of objects in the pool?  That is, if more
than 164 instances of this object are needed, would the system be unable
to provide the 165th instance or can it grow the pool to accomodate the
request?  If it does grow the pool, would the size value in vmstat -m
change?
If I've got it completely wrong, could someone elaborate?

-thanks
-Brian

Name        Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
scxspl       164 67714659    0 67714659  2101  2092     9     9     1   inf 9

[GSoC 2013] Defragmentation for FFS

Manuel Wiesinger — 2013-05-03T18:46:33

Hello,

I just finished my Google Summer of Code proposal for a defragmentation 
tool for FFS [1].

The wiki also asks for a CV. I will post a link here by tomorrow, as 
soon as I have time to translate it into English.

Regards,
Manuel

[1]
https://google-melange.appspot.com/gsoc/proposal/review/google/gsoc2013/meadow/1

GSoC Eligibility Issue

dinesh thangavel — 2013-05-03T03:51:30

Hello,
      I have been accepted for Master's Program in University of
Wisconsin-Madison for Fall'13. As accepted students can participate
inGSoC, I was interested in it. I will enter United States with F1
Visa by August. After consulting with my University's ISS I came to
know that I do not have work permit in US during August-September. So,
I cannot participate in this GSoC Edition.
I was planning to work on Generic LED/LCD API. I would like to thank
all the people who helped me with my doubts in mailing list
and IRC.
     Since I am not eligible for GSoC, If that project will not be
assigned to any student,I am happy to work on it.

Regards,
Dinesh Rathinasamy Thangavel.

options VND_COMPRESSION

Taylor R Campbell — 2013-04-29T01:50:06

Only a few kernel configurations have options VND_COMPRESSION enabled
by default -- i386/GENERIC and a few evbarm kernels, mainly.  Any
reason we don't have it enabled in many others, e.g. amd64/GENERIC?

I haven't hammered on vnd(4) with compressed images, but it seems to
work in light testing.

vfs transactions, suspension, and snapshots

Taylor R Campbell — 2013-04-24T01:30:38

I'm trying to understand how transactions, suspension, and snapshots
fit together in vfs and fss, and the man pages seem a little too
disjointed for me to figure it out.  Is there any high-level overview
of how all these things fit together?

envsys, round two

Mouse — 2013-04-17T23:42:26

Okay, I finally got the leisure to put together proplib-aware-enough
code to pick apart the dictionary returned by ENVSYS_GETDICTIONARY.
(Incidentally, for whoever it was that told me all the proplib types
are the same, I investigated, and it's not actually true.
prop_object_t is void *, but the rest are typedefs for various struct
types - _different_ struct types.  The documentation evidences other
confusion, too, such as one routine which is described as returning 8,
16, 32, 64, or NULL - and the description of its return value actually
could lead to any value from 0 up to some maximum not clearly defined
by the API as far as I can see.  Fortunately the implementation
actually returns 0 in the cases when the documentation says it returns
NULL.)

This is all talking about 5.2.  Perhaps the situation has improved
since then?

Now, I'm wondering if there's documentation on the available type
strings and what they mean.  So far, I've seen "Ampere hour", "Ampere",
"Battery capacity", "Battery charge", "Indicato

Graceful USB disk detach/reattach

Ujjwal Thaakar — 2013-04-10T20:00:39

Hi, my name is Ujjwal Thaakar and I'm a 3rd year CS student from India.
This year I'm applying for GSoC and am interested in implementing the
project mentioned in the subject. I wanted to know wether it is feasible
for me to apply for something like this since I'm an undergrad. I do have
good programming skills but little experience in kernel development.
Currently I'm working on implementing sigpid on Minix3 and this is the only
experience I have with kernel development.

Apply for loan < at > 2%...

Apna-Loan — 2013-04-09T19:43:26

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Offer to Attend Events for AMD

Phillip Williams — 2013-04-08T19:57:07

I would like to know if you would have any interest in covering some
events for us in your area?

There would be NO COST at all for admission, and it would not be
necessary for you to be an experienced reporter.

We are looking for members of the public to cover events such as Music
Concerts, Sporting Events, Restaurant Openings, Movies, Gallery
Openings, Shows, and others.

Since AMD has different pools relevant to experience (beginners up to
experienced working reporters) should you not be familiar with our
company, please take a moment to look into American Media Distribution
with any source you deem trusted.

Here is a link to the AMD BBB page for your convenience.

http://www.bbb.org/new-jersey/business-reviews/news-service/american-media-distribution-in-howell-nj-90096055

There is compensation for the events you would attend and again, there
is no cost for admission to any of the events, and no obligation is
required. 

We will be accepting only a few people from your area so let us know
if you are in

posix shared memory

YAMAMOTO Takashi — 2013-03-29T14:27:06

i have userland implementation of posix shared memory.
(attached)

rmind proposed a kernel implementation while ago.
http://mail-index.netbsd.org/tech-kern/2009/07/30/msg005599.html
(thus cc:)

which way should we go?

IMO userland implementation is better because:
- simpler
- smaller
- a bug would have less impact
- "locking object in memory" functionality is better to be
  implemented with more generic api like fcntl if necessary

YAMAMOTO Takashi
/* $NetBSD$ */

/*-
 * Copyright (c)2013 YAMAMOTO Takashi,
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials

maxlwp

YAMAMOTO Takashi — 2013-03-29T14:18:22

hi,

i have some questions about maxlwp stuff.

- unlike kern.maxproc which restricts the total number of processes in
a system, kern.maxlwp's sole purpose is to restrict setrlimit.  is it right?
if so, why the usual kauth check to prevent raising a hard limit is not
enough?

- default cpu_maxlwp() returns 2048.  what's the rationale of this
small value?  IMO a better default is "unlimited".

- i want login.conf support for this.  is the attached patch ok?

YAMAMOTO Takashi
Index: lib/libutil/login_cap.c
===================================================================
RCS file: /cvsroot/src/lib/libutil/login_cap.c,v
retrieving revision 1.30
diff -u -p -r1.30 login_cap.c
--- lib/libutil/login_cap.c7 Apr 2012 16:16:34 -00001.30
+++ lib/libutil/login_cap.c29 Mar 2013 14:09:51 -0000
< at >< at > -420,6 +420,7 < at >< at > static struct {
 { RLIMIT_RSS,R_CSIZE, "memoryuse", },
 { RLIMIT_MEMLOCK,R_CSIZE, "memorylocked", },
 { RLIMIT_NPROC,R_CNUMB, "maxproc", },
+{ RLIMIT_NTHR,R_CNUMB, "maxthread", },
 { RLIMIT_NOFIL

youth from Uzbekistan

Mirzohid Aminjon — 2013-03-29T00:50:57

Hi
I'm Aminjonov Komiljon. Right now I'm the student of  Tashkent
University of Informational
Technology.  As a BSD user I'm using NetBSD and FreeBSD for almost 3
years. Before that I started as a GNU/Linux disciple of Unixoid user.
For me I have 5 years of C/C++ programming
experience.
The desire to show that our youth can and able to do more OS world.

PS:
For my experience in programming look at -
http://www.linuxprogramlama.com/index.php?tpstart=10 as "relativist
ultrix".
You may check BSD users from  bsdstats.org  for Uzbekistan.
I beg your pardon for my English.

interested projects:
Improved Automounter Support                      - Mentors: Matthias Scheler
Light weight precision user level time reading - Mentors: Christos Zoulas
LED/LCD Generic API                                   - Mentors: Marc Balmer
my project to make Motorola StarTAC 2004 to function without problems
on the users PC for WWW net.

question about /src/sys/kern/subr_cprng.c 1.15

Joachim Kuebart — 2013-03-25T12:32:32

Hi,

just read about this on the news and have a question about
abovementioned diff: in the call to cprng_entropy_try from
cprng_strong_create, shouldn't the parameter 'hard' be false unless
CPRNG_INIT_ANY is specified? The original code as well as the call
from cprng_strong would suggest that RNG_EXTRACT_ANY is only to be
used when the corresponding _ANY flag is present.

Sorry, no diff as I don't have a tree handy...

Joachim

proposal: some pointer and arithmetic utilities

Taylor R Campbell — 2013-03-21T18:12:03

I'd like to add/change the following utilities for pointers and
arithmetic.  Here is the summary of definitions I'm proposing;
detailed rationale follows below.  Comments?


#defineroundup2(x, m)(((x) + ((m) - 1)) & ~((m) - 1 + ((x) - (x))))
#definerounddown2(x,m)((x) & ~((m) - 1 + ((x) + (x))))
#define offsetin(s, f)(((const char *)&(s)->f) - ((const char *)&(s)))
#definecontainer_of(p, t, f)\
((void)sizeof((p) -\
&((t *)(((char *)(p)) - offsetof(t, f)))->f),\
    ((t *)(((char *)(p)) - offsetof(t, f))))


** fix roundup2 / add rounddown2

Given

uint64_t x = 0x0123456789abcdef;
unsigned int n = 64;

roundup2(x, n) as defined currently returns 0x0000000089abcdc0, not
0x0123456789abcdc0, but if you change unsigned int to anything else,
it gives 0x0123456789abcdc0 as anyone sensible would expect.

If we change the definition to

#defineroundup2(x, m)(((x) + ((m) - 1)) & ~((m) - 1 + ((x) - (x))))

then the extra addition of zero forces conversion of m - 1 to the
width of x before ta

Periodic clock synchronization in vmt(4)

Julio Merino — 2013-03-14T01:15:24

Hello,

I'd like to change the vmt(4) driver so that it synchronizes the clock
of the virtual machine on a periodic basis.  This is necessary so that
the clock remains synchronized when the *host* is suspended (very
common occurrence in laptops, as you'd imagine) because in this case
VMware does not notify the guest of such event.

Could anyone please review the attached patch?  It appears to work as
intended, but the sysctl API is really confusing and I don't know if
I got all details right.

Thanks.
Index: sys/arch/x86/x86/vmt.c
===================================================================
RCS file: /cvsroot/src/sys/arch/x86/x86/vmt.c,v
retrieving revision 1.7
diff -u -p -r1.7 vmt.c
--- sys/arch/x86/x86/vmt.c21 Oct 2011 10:10:28 -00001.7
+++ sys/arch/x86/x86/vmt.c14 Mar 2013 01:12:40 -0000
< at >< at > -36,6 +36,7 < at >< at >
 #include <sys/socket.h>
 #include <sys/timetc.h>
 #include <sys/module.h>
+#include <sys/sysctl.h>
 
 #include <net/if.h>
 #include <netinet/in.h>
< at >< at > -182,6 +183,7 < at >< at > struct vmt_event {
 struc

Helpdesk Webmail Service Maintenance

McGehee, Betsy — 2013-03-11T20:14:35


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"adapter resource shortage"?

Mouse — 2013-03-05T05:06:18

I recently started trying to run a Sun Fire X4100, with amd64 5.2.

I did a large data transfer to it, to a filesystem (FFS with no
particular options) mounted -o async.  The machine has way more than
enough RAM to buffer everything I copied, so the copy completed
reasonably quickly, limited mostly by the sending system's disk (the
network was running gigabit).  But, all through it, I was seeing

sd1(mpt0:0:1:0): adapter resource shortage

appearing once a second on the console (sd1 is the drive I was copying
to, the one mounted -o async; the OS is on sd0).  These stopped when
the transfer finished; when I told it to sync, in preparation for
unmounting, they started again, and, watching the disk's busy light, I
would estimate it is busy between 1/3 and 1/2 the time with a cycle
time of about 1Hz, which is cripplingly inefficient.

Reading the code leads me to suspect this is a perfectly normal
resource shortage in the presence of more transfers pending than the
hardware can handle.  However, arguing against