On Tue, 25 Jun 2013 12:04:08 +0300, Kevin Wilson said:
Hi,
You are right, thanks!
disabling CONFIG_PRINTK_TIME prevented this timestamps.
I believe they should have provide some sysfs entry for this, sorry
they did not do so
Well actually, there's a boot-time cmdline parameter:
On Tue, 25 Jun 2013 09:56:43 +0300, Alexandru Juncu said:
On 23 June 2013 17:18, Dibyayan Chakraborty dib.cool...@gmail.com wrote:
Hi,
I came by a really weird macro code in linux/jbd.h which is
BUFFER_TRACE(bh,info) do{} while(0).
Please explain the necessity of this.
I'm not
On Tue, 25 Jun 2013 12:28:15 +0200, meccoma...@gmail.com said:
I'm really newbie and I don't know if this may help at all, but I googled
corruption of the file system debug and found
http://linux.die.net/man/8/debugfs
That won't help you debug a filesystem - debugfs is *itself* a
On Fri, 21 Jun 2013 17:54:04 -0400, Robert P. J. Day said:
* The core wakeup function. Non-exclusive wakeups (nr_exclusive == 0) just
* wake everything up. If it's an exclusive wakeup (nr_exclusive == small +ve
* number) then we wake all the non-exclusive tasks and one exclusive task.
On Tue, 28 May 2013 10:25:09 +0530, jack rule said:
I have to implement a dump utility which can dump the physical
memory just before the crash/(crash +reboot).
if anybody have worked with it pls share any info/structure as i
din't find anything yet on google.
Why spend time
On Tue, 28 May 2013 10:44:08 +0530, Varun Sharma said:
What is the value of mss for tcp segment.
It depends, among other things, on the MTU of your interface, the amount
of memory you have for buffers, the amount of memory at the other end,
and a few other things.
Did you try googling for 'TCP
On Tue, 28 May 2013 12:47:51 +0530, Varun Sharma said:
I want to know how two independent ssh session use same port for
communication .At what level difference is come.
Hint - a TCP connection is defined by a *4*-tuple of:
(local IP, local port, remote IP, remote port).
pgpKMETwooNDA.pgp
On Mon, 27 May 2013 15:51:26 +0800, lx said:
When I make it, the error messages is:
*namei.c:35: error: can't find a register in class
*This is why? *
Possibility 1: You screwed up the constrains on your asm and didn't leave
the compiler any way to allocate CPU registers.. I havent had
On Fri, 24 May 2013 11:05:57 +0300, Andy Johnson said:
Hello,
I have a dual boot machine, Ubuntu/Fedora.
I have a kernel tree on the fedora partition.
Now, I had build a kernel on the Fedora partition successfully.
I did **not** change anything in the tree, and then
When I boot into
On Mon, 20 May 2013 12:37:25 +0530, Dhyan said:
Is there any uboot config option in to print boot sequence with time
prefixes similar to kernel option CONFIG_PRINTK ?
I think you meant CONFIG_PRINTK_TIME there - and if that kernel option is
set, all your printks will show up with that, even
On Mon, 20 May 2013 13:55:25 +0530, Dhyan said:
Thank you for your quick reply, but what i need is *time in bootloader
print output*. Kernel i already enabled and i am getting the time,
That will require fixing your bootloader, which may be more than slightly
interesting, as there's usually no
On Mon, 20 May 2013 15:07:33 +0530, Dhyan said:
I was working on to measure boottime for bootime optimization.
The bootloader is probably not where you're going to find places to optimize.
It's got two jobs to do - load the kernel and load the initrd. And it's usually
pretty optimized to do
On Tue, 14 May 2013 11:15:35 +0530, Paul Davies C said:
It is an arbitrary question that popped in my mind. However, I came to know
that the constraints I stated in the previous mail is only restricted to
x86 only.Now besides my first questions , I have one more question, Why x86
only?
It's
On Tue, 14 May 2013 12:05:32 +0530, shampavman said:
But why does a simple read not turn out 1 block for me?
So explain to us why you think a read of 4096 bytes is reading something
other than 1 4K block?
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On Mon, 13 May 2013 14:11:22 -0500, Sergio Andr said:
2. When user applications allocates memory, the kernel must allocate
virtual memory and physical memory, right?
Wrong. If userspace allocates (say) 15M of memory, the kernel has every right
to overcommit and not actually allocate either
On Thu, 09 May 2013 22:25:54 +0530, Buland Kumar Singh said:
Is there a kernel routine ( not a system call ) that a kernel module can call
to lock
all of the pages of a particular VMA of a user process that is using the
driver ?
What are you trying to accomplish here? And why isn't using
On Mon, 06 May 2013 14:44:03 -, Warlich, Christof said:
$ dd if=/dev/mem bs=1 count=1024 skip=4150263808
dd: reading `/dev/mem': Bad address
0+0 records in
0+0 records out
0 bytes (0 B) copied, 6.6658e-05 s, 0.0 kB/s
The kernel config help says that _PCI_ memory access is even
On Tue, 30 Apr 2013 21:17:44 +1000, Sven Dowideit said:
I was browsing around and noticed that the wiki mentions the oftc
#kernelnewbies group, which doesn't appear to be active at the moment.
Assuming I'm correct, I'd like to update things like that - could I be
added to the editor's list?
On Sat, 27 Apr 2013 19:34:00 +0300, Kevin Wilson said:
Hello,
static int __init init_zeromib(void)
This is your init routine...
{
int ret = 0;
printk(in %s\n,__func__);
Missing KERN_DEBUG or similar here. This can cause it to fail
to appear in dmesg output, causing much confusion.
On Fri, 19 Apr 2013 23:55:49 +0530, Sankar P said:
myfunctionname +0x2507 +5679
That function is too honking big and needs to be refactored. :)
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On Tue, 16 Apr 2013 16:33:17 -0700, Arlie Stephens said:
I have some kernel routine I'd like to get called, with the decision
to call it made in user space.
The proper answer here is *highly* dependent on exactly what this routine
has to do once it's called.
Can you explain the problem the
On Sun, 14 Apr 2013 10:09:54 +0200, mic...@michaelblizek.twilightparadox.com
said:
This is not what I meant. When the qdisc has a size of say 256KB and the
socket memory is, say 128kb, the socket memory limit will be reached before
the qdisc limit and the socket will sleep. But when the
On Thu, 11 Apr 2013 23:08:21 +0800, Peter Xu said:
Hi, all,
It seems that Intel will publish a nice chip called Bay Trail (or plus,
I don't quick sure, which is for smartphones/tablets, also some lower
ends of laptops in the future). It was said publically that Intel will
support Linux
On Mon, 08 Apr 2013 08:57:01 +0800, Ben Wu said:
int memcmp(const void *cs, const void *ct, size_t count)
{
I want to know why it use the temp pointer su1, su2? why it doesn't directly
use the cs and ct pointer?
This is a C 101 question, not a kernel question. But anyhow..
They're
On Mon, 08 Apr 2013 05:56:29 +0400, Max Filippov said:
const is the the object they point to, not the pointers themselves
(that would be
void * const cs).
memcmp compares bytes at which cs and ct point, but these are void pointers,
and the expression res = *cs - *ct is thus meaningless.
On Wed, 03 Apr 2013 14:03:40 +0530, naveen yadav said:
I have code written, and I cannot modify. I want to fix user stack size for
all threads in glibc,
'man ulimit'?
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On Wed, 03 Apr 2013 19:08:45 -0700, Arlie Stephens said:
- I've got a linked list, with entries occassionally added from normal
contexts.
- Entries are never deleted from the list.
This is already busted - you *will* eventually OOM the system this way.
This would be simple, except that the
On Tue, 02 Apr 2013 12:12:09 +0900, manty kuma said:
Is there any way i could read the reason for reboot.
I want to read it so that i can get the reason that is stored.
like 0xABADBABE is watchdog 0xCODEDEAD is panic. Etc..
Please suggest an alternative approach.
See the 'pstore'
On Tue, 02 Apr 2013 16:46:24 +0300, Kevin Wilson said:
Hi,
Thanks a lot Vlad. This explains it.
- Does anybody know of a ps command (or a filter to ps command)
which will display only multithreaded
processes (list processes by TGID) ? (I know now about the option of
displaying
On Mon, 01 Apr 2013 17:50:43 -0300, Daniel Hilst said:
Any reason you can't just 'rsync /source-fs /dest-fs'?
because I can't use dest-fs while rsynching
Sure you can. You just have to remember to pay attention to race
conditions - if you create foo/bar.dat on the dest and then rsync
wants
On Mon, 01 Apr 2013 15:10:46 +0800, Ben Wu said:
1 I found some placeuse two !!, what's means
if(button-gpio != INVALID_GPIO)
state = !!((gpio_get_value(button-gpio) ? 1 : 0) ^
button-active_low);
else
Gaah. That line of code fell out of the ugly tree and hit every branch
on
On Sat, 30 Mar 2013 18:01:32 +0800, RS said:
Now I think this will spend more time than the kernel code when executed.
Have you actually examined the generated code on several popular
architectures to see what gcc actually does?
(hint - many things can constant-folded at compile time. So if
On Fri, 29 Mar 2013 15:44:49 +0530, Sankar P said:
I have decided on a simple layout for my filesystem where the first
block will be the super block and will contain the version
information etc. The second block will contain the list of inodes.
Third block onwards will be data blocks. Each
On Fri, 29 Mar 2013 17:09:14 -0300, Daniel Hilst said:
The idea is, mount both filesystems together, and make write/read
operations go on this way
Read operations:
1. See if data is already on dest fs,
2. If is then read data and bright back to caller (lets call this
cold read)
On Wed, 27 Mar 2013 20:38:54 +0800, ishare said:
I am do some test on kernel 2.6.0 and encountering an problem about
initramfs .
I find my initramfs generated without a initramfs_list file ,which describes
the list of files that will be created into the initramfs file . such as
On Mon, 25 Mar 2013 16:33:48 -0700, Raymond Jennings said:
Just curious, is there a cap on how much data can be in writeback at
the same time?
I'm asking because I have over a gigabyte of data in dirty, but
during flush, only about 60k or so is in writeback at any one time.
Only a gigabyte?
On Mon, 25 Mar 2013 17:23:40 -0700, Raymond Jennings said:
Is there some sort of mechanism that throttles the size of the writeback pool?
There's a lot of tunables in /proc/sys/vm - everything from drop_caches
to swappiness to vfs_cache_pressure. Note that they all interact in mystical
and
On Sun, 24 Mar 2013 16:27:27 +0800, ishare said:
Hi :
I find that my initramfs_data.cpio generated by gcc does not contain init
files ,which should be
executed by terminal initialization.
My initramfs_data.cpio only contains these : /dev /dev/consol /root .
where to
On Fri, 22 Mar 2013 13:41:25 +0800, ishare said:
Is it needed or must to compile fs and driver with -O2 option when
compiling kernel ?
It's not strictly mandatory to use -O2 (for a while, -Os was the default). There
are a few places that for correctness, you *cannot* use -O0. For instance,
On Fri, 22 Mar 2013 22:32:40 +0800, ishare said:
are a few places that for correctness, you *cannot* use -O0. For instance,
a
few places where we use builtin_return_address() inside an inline (-O0
won't inline so builtin_return_address() ends up returning a pointer to
a function when we
On Fri, 22 Mar 2013 10:52:56 -0400, valdis.kletni...@vt.edu said:
No debug information is stripped by -O2. Debug information isn't emitted if
you don't compile with -g. At one time, long ago (quite possibly literally
before you were born for some of the younger readers on the list), gcc was
On Fri, 22 Mar 2013 13:53:45 -0700, Raymond Jennings said:
The first heap would be synchronous requests such as reads and syncs
that someone in userspace is blocking on.
The second is background I/O like writeback and readahead.
The same distinction that CFQ completely makes.
Again, this
On Wed, 20 Mar 2013 16:37:41 -0700, Raymond Jennings said:
Hmm...Maybe a hybrid approach that allows a finite number of reverse
seeks, or as I suspect deadline does a finite delay before abandoning
the close stuff to march to the boonies.
Maybe. Maybe not. It's going to depend on the
On Wed, 20 Mar 2013 00:07:57 -0700, Kumar amit mehta said:
I forgot that 'uname -m' will return me the kernel version and _not_ the CPU
architecture. The CPU on my machine seem to be 64 bit (/proc/cpuinfo|grep
flags
shows 'lm'). So my understanding is that I've a 32 bit kernel running on a
On Thu, 21 Mar 2013 02:24:23 +0700, Mulyadi Santosa said:
pardon me for any possible sillyness, but what happen if there are
incoming I/O operation at very nearby sectors (or perhaps at the same
sector?)? I suppose, the elevator will prioritize them first over the
rest? (i.e starving will
On Wed, 20 Mar 2013 14:41:31 -0700, Raymond Jennings said:
Suppose you have requests at sectors 1, 4, 5, and 6
You dispatch sectors 1, 4, and 5, leaving the head parked at 5 and the
direction as ascending.
But suddenly, just before you get a chance to dispatch for sector 6,
sector 4 gets
On Wed, 20 Mar 2013 16:05:09 -0700, Arlie Stephens said:
The ongoing thread reminds me of a simple question I've had since I
first read about linux' mutiple I/O schedulers. Why is the choice of
I/O scheduler global to the whole kernel, rather than per-device or
similar?
They aren't global to
On Tue, 19 Mar 2013 20:41:55 +0530, Niroj Pokhrel said:
#includestdio.h
int main()
{
while(1)
{
}
return 0;
}
I don't understand where does mmap or malloc come in to play in this code.
Unless you linked it statically, a lot of stuff happens before you ever
get to main()
On Mon, 18 Mar 2013 06:50:25 +0100, mic...@michaelblizek.twilightparadox.com
said:
Hi!
On 06:52 Fri 08 Mar , mic...@michaelblizek.twilightparadox.com wrote:
./a.out `ps a|grep wget|grep -v grep
To save the double grep, you can do something like this:
ps a | grep '[w]get' | ...
On Tue, 19 Mar 2013 09:38:49 +0800, ishare said:
I am linking my kernel by a link script. its contens is as below:
I think it will work ,but ld report that No enough room for programme
header,what is the reason?
what should I do ?
The first thing you do is ask yourself why you're using
On Tue, 19 Mar 2013 12:44:36 +0800, ishare said:
because I need to generate a .so for sysenter used
And that solves what problem for you, exactly?
Consider that most architectures that use sysenter manage to do so
without having to worry about a .so for it (or if they really do need
one,
On Fri, 15 Mar 2013 06:22:14 -0700, Raymond Jennings said:
Is there a kernel list dedicated to discussion of block devices?
What's to discuss? There probably isn't enough ongoing traffic to
support a separate mailing list (we got too many of them as it is :)
MAINTAINERS says:
BLOCK LAYER
M:
On Tue, 12 Mar 2013 18:38:05 +0530, Prabhu nath said:
On Sun, Mar 10, 2013 at 11:30 PM, Christoph Seitz c.se...@tu-bs.de wrote:
I use a char device for reading and writing from/to a pcie dma card.
Especially the read function makes me some headache. The user allocates
some memory with
On Tue, 12 Mar 2013 15:03:53 +0100, Christoph Seitz said:
I found out, if I use the force flag with get_user_pages, the pages get
faulted, but there has to be a nicer way than using the force flag.
Why does there have to be a nicer way? Maybe you already got the nice way.
(Hint - why does
On Sun, 10 Mar 2013 19:27:52 +0530, harish badrinath said:
Is it possible to intercept (both read and write) a locally valid
address of a process and replace it with our own values (it is for a
transparent distributed shared memory project).
Go look at how gdb traces variables.
On Sun, 10 Mar 2013 19:27:52 +0530, harish badrinath said:
Hello,
Is it possible to intercept (both read and write) a locally valid
address of a process and replace it with our own values (it is for a
transparent distributed shared memory project).
(Damn, hit send too soon)
Go look at how
On Sun, 10 Mar 2013 20:35:37 +0100, Jagath Weerasinghe said:
readq and writeq do the job.
Please double-check how those are implemented on your architecture. I seem
to remember that on some systems, readq and writeq may not be atomic and
may become two bus cycles. And some hardware cares about
On Sun, 10 Mar 2013 20:35:37 +0100, Jagath Weerasinghe said:
Hi,
readq and writeq do the job.
(hit send too soon) Also, the read/write [bwlq] functions refer to the width
of the *data*, not the address
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On Thu, 07 Mar 2013 17:17:19 +0200, Kevin Wilson said:
Does this mean that once you are disabling
interrupts, these interrupts are lost ? even later, when we will
enable interrupts, the interrupts from the past that should have been
created (but interrupts were disabled at that time
On Thu, 07 Mar 2013 09:28:58 -0800, Dave Hylands said:
In my experience, edges triggered interrupts are always latched by the HW
when they arrive. If another edge comes along between the initial edge and
the time that the interrupt is cleared, then this second edge is lost. The
fact that an
On Wed, 06 Mar 2013 10:39:13 -0800, Kumar amit mehta said:
Now, if alloc_skb(4096, GFP_KERNEL) is the routine that gets called to
allocate
the kernel buffer then, how does the kernel manages such prospective memory
allocation failures and how kernel manages large packet requests from the
On Wed, 06 Mar 2013 18:19:09 -0500, Konstantin Kowalski said:
1.) Currently, I am reading 2 books about Linux kernel: Linux Device
Drivers (3rd edition) and Linux Kernel Development (3rd edition).
I like both books and I am learning a lot from them.
I heard that both of this books are
On Thu, 07 Mar 2013 10:33:18 +0800, ishare said:
kernel halts because the page mapping has been modified by zap_low_mappings
why we should do zap_low_mappings in init procedure ? this will disorder
the page mapping.
You might want to get yourself an up to date kernel, as the code
On Thu, 07 Mar 2013 11:43:43 +0800, ishare said:
set_pgd(swapper_pg_dir+i, __pgd(0));
If I have not define CONFIG_X86_PAE ,then the low mem will be invalided all .
And what makes you think that call invalidates *all* the page
mappings?
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On Tue, 05 Mar 2013 09:07:51 +0700, Mulyadi Santosa said:
On Tue, Mar 5, 2013 at 7:48 AM, Pietro Paolini pulsarpie...@aol.com wrote:
echo 2 Run 'make oldconfig make prepare' on kernel src
try the suggested above step. IIRC, those commands will do things like
preparing the
On Tue, 05 Mar 2013 11:02:45 +0530, Mandeep Sandhu said:
next schedule. I think the waiting threads (processes) will moved from
the wait queue to the run queue from where they will be scheduled to
run.
For bonus points, read source code and/or comments and figure out what
Linux does to
On Sun, 03 Mar 2013 12:13:51 +0800, ishare said:
Is there mothod to look up the call stack of tcp protocol solution?
ftrace and related functionality.
Note that there is a difference between look up the call stack
and trace the flow of execution. Consider the following code:
int a (
On Sat, 02 Mar 2013 16:36:43 +0800, Jacky said:
The -O binary is removed. And I don't find any changelog.
A quick course on researching kernel development history...
Step 1: 'git blame arch/x86/boot/compressed/Maekfile'
That gives us the line:
099e1377 (Ian Campbell2008-02-13
On Fri, 01 Mar 2013 16:48:12 +0530, sandeep kumar said:
Don't you think it should throw panic()while calling the ioremap() itself.
Because this sounds like a serious violation...
As you noted, it does give you a warning.
That's a kernel design philosophy - to reserve the panic() and BUG()
On Sat, 02 Mar 2013 10:28:26 +0800, lx said:
if (block = 7+512+512*512) because the i_zone[9].
But the question is why the i_zone[7] can repesent 512 , and i_zone[8] can
repesent 512*512 ?
Sngle, double, and triple indirect blocks...
http://en.wikipedia.org/wiki/Inode_pointer_structure
On Wed, 27 Feb 2013 15:38:00 +0530, sandeep kumar said:
In development phase of the board, we are trying to measure RAM performance
gain while changing type of the RAM.
The standard benchmark tools are giving us the Cache performance only. So
we want to try some method to measure RAM
On Tue, 26 Feb 2013 06:23:34 +0800, horseriver said:
does general_protection trap necessarily result to die ?
Think for a bit - what other actions can reasonably be taken? You
hit a GPF, it's obvious that the variables you're working on have
been corrupted, so automatically continuing is
On Tue, 26 Feb 2013 22:35:35 +0700, Mulyadi Santosa said:
let' see
what if you do read and write pattern, in certain order so that it
will be invalidated by the L1/L2/L3 cache everytime?
AFAIK, one thing for sure, reading data from sequentially and re-read
them will make end up reading
On Tue, 26 Feb 2013 11:19:18 -0500, Phani Vadrevu said:
I am writing a network driver for the e1000 card. While doing the
receive part, I saw that the kernel freezes whenever it reaches the
netif_rx(skb) call. I was able to reproduce the same error when using
a bare bones driver where I hard
On Sun, 24 Feb 2013 11:50:14 +0100, richard -rw- weinberger said:
On Sun, Feb 24, 2013 at 10:42 AM, Shraddha Kamat sh200...@gmail.com wrote:
what is the relation between atomic operations and memory alignment ?
I read from UTLK that an unaligned memory access is not atomic
please
On Mon, 25 Feb 2013 12:26:06 +0530, Shraddha Kamat said:
#define barrier() asm volatile( ::: memory)
What exactly volatile( ::: memory) doing here ?
You probably should read Documentation/memory-barriers.txt
in your kernel source tree, and let us know if you still have
questions after that...
On Fri, 22 Feb 2013 14:36:17 +0200, Adel Qodmani said:
My question is quite simple, I have an sk_buff that I want to transmit, the
sk_buff is an ICMP message and so far, I've built the headers and set up
everything.
Others have given some details on how. A better question is why.
Sending an
On Fri, 22 Feb 2013 17:15:35 +0200, you said:
I am trying to implement a new protocol that we've designed which works on
top of the IP layer, so I am using ICMP messages to carry control
information for the protocol.
Why using ICMP, it seemed natural since our protocol is a Network-layer
On Thu, 21 Feb 2013 15:57:46 +0530, Sandeep Sonawane said:
Please remove my email id sandeep.sonaw...@gmail.com from this DL.
If your mail software supported RFC2369 mail headers, you would have
seen the following on every posting to the list:
List-id: Learn about the Linux kernel
On Tue, 19 Feb 2013 10:37:28 +0200, Kevin Wilson said:
Hi all,
I am trying to send a SIGKILL to a kernel module which is sleeping.
I added a printk after the sleep command.
Sending a SIGLKILL (by kill -9 SIGLKILL pidOfKernelThread) does **not**
yield the message from printk(calling
On Wed, 20 Feb 2013 01:58:17 +0700, Mulyadi Santosa said:
On Tue, Feb 19, 2013 at 7:20 PM, David Shwatrz dshwa...@gmail.com wrote:
Hi, kernel newbies,
We have:
#define cpu_relax() asm volatile(rep; nop)
in arch/x86/boot/boot.h.
Why don't we use the PAUSE assembler instruction
On Mon, 18 Feb 2013 15:46:58 -0300, Daniel. said:
Is there a way to track signals, specially SIGKILL. I would like to
know if some process dies because reach some resource limit, because
an OMM error or something likewise..
Depends on where you want the tracking to go. But your first thing to
On Tue, 19 Feb 2013 10:50:26 +0530, kapil agrawal said:
How the linux kernel runs in the system after spawning the init and
mounting the root FS.
Does it run as some background process ?
No. You probably want to get some basic knowledge about operating
systems in general.
On Tue, 19 Feb 2013 12:01:55 +0530, kapil agrawal said:
Do you mean process with PID 0 is the one, which runs in the background and
serves the request from userland and goes to cpu_idle() if nothing to run.
No. Large parts of the kernel run in kernel mode, but using the 'struct task'
of the
On Sat, 16 Feb 2013 18:48:52 +0200, Kevin Wilson said:
~0U is not 0 but -1;
-ENOCAFFEINE.
You'd think that after having done kernel-level C programming since the days
of SunOS 3.1.5 and BSD 4.2 I'd k know better. ;)
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On Fri, 15 Feb 2013 12:16:02 +0200, Kevin Wilson said:
Is the prefetch operation synchronous ? I mean, after calling it, are
we gauranteed that the variable is
indeed in the cache ?
No, the whole *point* is that it's asynchronous. You issue the prefetch
several lines of code before you need
On Thu, 14 Feb 2013 15:33:48 +0200, Kevin Wilson said:
Hi,
0x08048000 address is the start address of the code segment of a
program in on x86-32.
More likely, it was the start address of *one particular run* of the
program. In most kernel configurations, there's something called Address
On Sat, 09 Feb 2013 13:10:47 +0800, horseriver said:
In one process ,what is the max number of opening file descriptor ?
Can it be set to infinite ?
In network programing ,what is the essential for the maximum of
connections
dealed per second
In general, you'll find that
On Mon, 11 Feb 2013 06:07:38 +0800, horseriver said:
Actually , my question comes from network performance ,I want to know ,in
per second ,the
maximum of tcp connections that can be dealed with by my server.
That will be *highly* dependent on what your server code does with each
On Thu, 07 Feb 2013 16:19:33 +0800, horseriver said:
hi:)
I am curious about how hd controller work .
When user am reaing/writing hd ,it was implemented by sending command
to hd controller's special port.Then ,how does the controller know
a new command has received?
In this
On Thu, 07 Feb 2013 23:20:27 +0530, anish kumar said:
Other insteresting standard logs managed by syslog
are /var/log/auth.log, /var/log/mail.log.
Other interesting *common* logs, as shipped pre-configured by some distros.
They are hardly a standard (unless the definitions of these
managed to
On Fri, 08 Feb 2013 07:48:39 +0800, Peter Teoh said:
So the drivers just literally concatenate these command into a string and
send it over to the device.
The reason that good disk drivers are hard to write is because it isn't
*just* literally concatenating the commands - it also has to do
On Wed, 06 Feb 2013 12:30:37 +0800, horseriver said:
root = ? You mean the aasignment at grub command line ?
For instance, the grub entry for the kernel I'm running right now:
title 3.8.0-rc6-next-20130206
kernel /vmlinuz-3.8.0-rc6-next-20130206 ro
On Wed, 06 Feb 2013 13:21:17 +0800, horseriver said:
At booting stage,kernel need to detect the hard device before mount it,
does this work need pci's surport?
That depends. Is the controller for the hard drive a PCI-based controller? On
most x86-based boxes, it is (and I'm not sure
On Wed, 06 Feb 2013 23:19:26 +0530, jeshkumar...@gmail.com said:
Can anyone suggest a good tutorial to create our own scheduler ?
Doing an I/O scheduler is pretty trivial, and there's a number of
examples in-tree already to look at.
If you mean a CPU scheduler, the major reason why there's no
On Wed, 06 Feb 2013 13:20:13 -0500, Greg Freemyer said:
Most new MB's have a SATA controller directly on the MB connected directly
to either the North or South bridge (I don't know which).
I don't think any PCI is support needed to talk to the boot disk.
Yes, but said SATA controller and
On Wed, 06 Feb 2013 20:40:47 +0100, Jonathan Neuschäfer said:
I'm sorry to ask, but don't you rather mean watts than watts per second?
There may indeed be a second order time component involved - for instance, a
cooling system that can handle 10 watts continuously, 20 watts for up to 30
On Tue, 05 Feb 2013 04:59:42 +0800, horseriver said:
hi:
It is not a cpio archive , so that command can not work .
its file system type is tmpfs.
Umm. No. It's not tmpfs.
tmpfs is a specific ram/swap based filesystem - basically, take enough
4K pages for the size= parameter and do it in
On Tue, 05 Feb 2013 14:07:37 +0100, Grzegorz Dwornicki said:
I guess that there may be a better API that why this thread was created in
first place. My project goal is to make process checkpoints like cryopid
had. This is for my thesis and will be GPL for everyone after my
graduaction. I am
On Wed, 06 Feb 2013 04:43:20 +0800, Jimmy Pan said:
in fact, i've been always wondering what is the relationship between dmesg
and /var/log/message. they diverse a lot...
What ends up in /var/log/message is some subset (possibly 100%, possibly 0%)
of what's in dmesg. Where your syslog daemon
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