Hi!
On 10:35 Tue 16 Apr , Alexandre Laurent wrote:
...
> I am running the same test, but connecting twice on the remote machine
> (one connection by test instance). I am using exactly the same commands
> than during the others experiments. But, by using two SSH instances,
> the
> niceness wil
Hi!
On 03:45 Sun 14 Apr , valdis.kletni...@vt.edu wrote:
> On Sun, 14 Apr 2013 08:15:21 +0200, mic...@michaelblizek.twilightparadox.com
> said:
>
> > It would be interesting to see what will happen if the qdisc is smaller than
> > the socket memory...
>
> As long as the qdisc is able to sen
Hi!
On 14:11 Sat 13 Apr , christian...@wwad.de wrote:
> Hi All,
>
> can someone please explain me, how the kernel handles different
> transfer rates of different net_devices? Or in other words: How does
> the systemcall send() know, when to block?
>
> An example:
> cat /dev/zero | pv | nc
Hi!
On 14:03 Thu 04 Apr , Arlie Stephens wrote:
...
> On Apr 04 2013, mic...@michaelblizek.twilightparadox.com wrote:
...
> > On 19:08 Wed 03 Apr , Arlie Stephens wrote:
...
> > > fix __list_add() so it updates pointers in the new entry before updating
> > > pointers in its neighbours,
> >
Hi!
On 17:38 Thu 04 Apr , Tarun Batra wrote:
> Can anyone plz explain me the fields
>
>
> skb = kmem_cache_alloc(skbuff_head_cache, gfp_mask & ~_ _GFP_DMA);
> ... ... ...
> size = SKB_DATA_ALIGN(size);
size of data buffer (the bytes you send over the wire not the overhead of
everyt
Hi!
On 19:08 Wed 03 Apr , Arlie Stephens wrote:
...
> Put another way, my problem is that I want the readers to be able to
> do their thing regardless of the state of the lock that serializes
> writers.
>
> In all cases, writers are protected from each other with a mutex.
>
> Here are some
Hi!
On 17:29 Thu 04 Apr , Tarun Batra wrote:
> Hi All,
>
>
> I was reading "Understanding linux networking Internal" book and the pdf
> "Network packet capture in Linux kernelspace" on the link
> https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0CDQQFjAA&url=http%3A%2F%2
Hi!
On 06:52 Fri 08 Mar , mic...@michaelblizek.twilightparadox.com wrote:
>./a.out `ps a|grep wget|grep -v grep|sed "s/^[^0-9]*\([0-9]*\).*$/\1/"`
The command above returned the strace pid. Fixed version:
./a.out `ps a|grep wget|grep -v grep|grep -v strace|sed
"s/^[^0-9]*\([0-9]*\).*
Hi!
I am trying to test for signal handling race conditions (specifically, I
suspect the kernel side of connect() does interesting things if the server
response arrives while the program executes a signal handler) and want to
flood a program with lots of signals. So I have run this:
---
#!/bin/ba
Hi!
On 20:31 Wed 20 Feb , Soham Chakraborty wrote:
> Hi all,
>
> I posted this question in linux-mm list as well but it didn't spawn much
> interest. So, I am putting the same question here also. Would love if
> someone can put some traction.
>
> The question is salivating and simple. When w
Hi!
On 12:16 Fri 15 Feb , Kevin Wilson wrote:
...
> AFAIK, what prefetch does is get a variable from memory and put it in
> cache (L2 cache I believe).
Yes, this is true. See:
http://gcc.gnu.org/onlinedocs/gcc-4.7.2/gcc/Other-Builtins.html
I am not so sure about the cache level it is fetched
Hi!
On 14:24 Mon 11 Feb , valdis.kletni...@vt.edu wrote:
> On Sat, 09 Feb 2013 13:10:47 +0800, horseriver said:
...
> >In network programing ,what is the essential for the maximum of
> > connections
> >dealed per second
> ...
> So the *real* question
> becomes "how many times per sec
Hi!
On 22:47 Sun 10 Feb , Peter Teoh wrote:
> On Sun, Feb 10, 2013 at 8:29 PM,
> wrote:
>
> > Hi!
> >
> > On 13:10 Sat 09 Feb , horseriver wrote:
> > > hi:)
> > >
> > >In one process ,what is the max number of opening file descriptor ?
> >
> > Type "ulimit -a" in your shell. On my sys
Hi!
On 13:10 Sat 09 Feb , horseriver wrote:
> hi:)
>
>In one process ,what is the max number of opening file descriptor ?
Type "ulimit -a" in your shell. On my system (debian) the default is 1024.
>Can it be set to infinite ?
Maybe, but at least it can be set very high.
>In ne
Hi!
On 17:19 Wed 26 Sep , Rahul Bedarkar wrote:
> Hi,
>
> I have to capture kernel udev events through libudev. One of API
> provides asynchronous events by reading on file descriptor. I found
> that there two ways to do that.
>
> 1) select call
> 2) epoll
>
> I also found that epoll is sma
Hi!
On 16:28 Tue 25 Sep , Rifat Rahman wrote:
> Hello there,
>
> I need to mangle rtp packets in kernel space. So far I am new in kernel
> module programming. I am trying to implement a module for netfilter hooks.
> For the first time as exercise, I am trying to write smaller modules. Let
> m
Hi!
On 09:12 Tue 25 Sep , V.Ravikumar wrote:
> On Mon, Sep 24, 2012 at 9:03 PM,
> wrote:
>
> > Hi!
> >
> > On 17:02 Mon 24 Sep , V.Ravikumar wrote:
> > > Hello all ,
> > >
> > > Could some body please suggest any books/links for Linux networking
> > > protocol development.
> > > Protocol
Hi!
On 17:02 Mon 24 Sep , V.Ravikumar wrote:
> Hello all ,
>
> Could some body please suggest any books/links for Linux networking
> protocol development.
> Protocol development at L2/L3 layers.
There is a book called "The Linux Networking Architecture: Design and
Implementation of Network P
Hi!
On 22:27 Mon 03 Sep , Mulyadi Santosa wrote:
> Hi :)
>
> On Mon, Sep 3, 2012 at 8:00 PM, Graeme Russ wrote:
> > Hi All,
> >
> > I am mounting /home over NFS which is great, but it really kills compile
> > times. So I have a local HDD which I have copied all my source code over
> > from w
Hi!
On 23:00 Mon 03 Sep , Graeme Russ wrote:
> Hi All,
>
> I am mounting /home over NFS which is great, but it really kills compile
> times. So I have a local HDD which I have copied all my source code over
> from which I do my coding and compiling.
>
> What I would love to do is use the loc
Hi!
On 17:57 Thu 21 Jun , Vijay Chauhan wrote:
> Hello,
>
> I am newbie.
> It has been said "kernel memory is not pageable"
> What does it mean? There is no concept of kernel virtual address?
>
> Any simple explanation will help me to udnerstand.
The right term is actually "kernel memory is
Hi!
On 00:50 Thu 31 May , harryxiyou wrote:
...
> I have never seen struct define like
>
> "struct device;
> struct device_private;
> struct device_driver;
> [...]
> struct device_node;
> struct iommu_ops;"
This basically says that these structs exist and are defined somewhere. You
need this
Hi!
The bug seems fixed somewhere in mainline between 3.1.0-rc1 and 3.4-rc6.
-Michi
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Hi!
On 11:53 Thu 10 May , Mulyadi Santosa wrote:
> Hi again... :)
>
> On Thu, May 10, 2012 at 1:49 AM,
> wrote:
> > Hi!
> >
> > On 00:19 Thu 10 May , Mulyadi Santosa wrote:
> >> Hi...
> >>
> >> On Wed, May 9, 2012 at 11:41 AM,
> >> wrote:
> >> > /usr/bin/ld: .tmp_vmlinux2: section __mod
Hi!
On 00:19 Thu 10 May , Mulyadi Santosa wrote:
> Hi...
>
> On Wed, May 9, 2012 at 11:41 AM,
> wrote:
> > /usr/bin/ld: .tmp_vmlinux2: section __modver vma 0x6028c000 overlaps
> > previous sections
> > KSYM .tmp_kallsyms2.S
> > AS .tmp_kallsyms2.o
> > LD vmlinux
> > /usr/bin
Hi!
I am facing a weird problem:
$ ARCH=um make linux
make[1]: `arch/um/sys-x86_64/user-offsets.s' is up to date.
CHK include/linux/version.h
CHK include/generated/utsrelease.h
CALLscripts/checksyscalls.sh
CHK include/generated/compile.h
QUOTE arch/um/kernel/config.tmp
Hi!
On 09:47 Thu 03 May , Abu Rasheda wrote:
> On Thu, May 3, 2012 at 6:54 AM,
> wrote:
> > Hi!
> >
> > On 16:33 Thu 03 May , Suresh Kumar Subramanian wrote:
> >> Hi,
> >>
> >> I am building the router based on linux kernel.
> >>
> >> The hardware details are below,
> >> 2 - 64 bit quad c
Hi!
On 16:33 Thu 03 May , Suresh Kumar Subramanian wrote:
> Hi,
>
> I am building the router based on linux kernel.
>
> The hardware details are below,
> 2 - 64 bit quad core processor (3Ghz core).
> RAM- 24GB RAM.
> PCI express slot- connected with Quad Port 100Mbps Ethernet adapter -2. (s
Hi!
On 09:29 Tue 01 May , Bill Traynor wrote:
> I have an Editor account for the kernelnewbies.org wiki, but all pages
> are currently immutable. Was the wiki made read-only at some point?
You must be on http://kernelnewbies.org/EditorsGroup to make changes. This
was made for spam procection
Hi!
On 17:38 Sat 03 Mar , hujun_hotmail wrote:
> I want to know what is the difference between a kernel BUG and a kernel Oops
> , who can tell me?
A BUG() is something like an assertion. Basically this means that a developer
thought that a certain situation should never be happen and if it d
Hi!
On 22:22 Fri 10 Feb , Peter Senna Tschudin wrote:
...
> I'm measuring the running time of that portion of code 512 times. Then
> calculate the geometrical mean of results. See one output example:
>
> Original_code:,
> 514,110,92,104,107,101,101,
...
> The geometrical mean of the values is
Hi!
On 19:47 Fri 10 Feb , Peter Senna Tschudin wrote:
...
> #include
>
> getnstimeofday (ts_start); /*stopwatch start*/
...
> getnstimeofday (ts_end); /*stopwatch stop*/
>
> diff = timespec_sub(end, begin);
>
> printk ("%lu,", diff.tv_nsec );
>
> Am I doing anything wrong? Can mysterious
Hi!
On 10:58 Thu 09 Feb , Peter Senna Tschudin wrote:
...
> But I want to repeat the tests on specific portion of code, not on
> entire application. Is there a safe way of do something like:
>
> start_bench ( ?? ); /* start measurement */
>
> buf_ptr_end = q->bufs[q->num_buffers];
>
> for (
Hi!
On 12:30 Fri 30 Dec , nilesh wrote:
> On Thursday 29 December 2011 08:23 PM, Rahul Kumar wrote:
> > Hi,
> >
> > I would like to check the interface status (up/down) within linux kernel.
> > Is there any routine (sort of ioctl) to do this. Any code that is
> > already in use in kernel would
Hi!
I could not see any locking being done with "struct net_device" at all even
tough there are many read+write accesses to non-atomic variables. For example:
Changing mac addresses:
user space netlink socket call to set IFLA_ADDRESS
http://lxr.linux.no/linux+v3.1.6/net/core/rtnetlink.c#L1521
htt
Hi!
On 09:53 Thu 29 Dec , Rahul Kumar wrote:
> Hi,
>
> I would like to check the interface status (up/down) within linux kernel.
> Is there any routine (sort of ioctl) to do this. Any code that is
> already in use in kernel would also be helpful for me.
> Please let me know.
If you want to c
Hi!
On 21:56 Sat 03 Dec , onlyfever wrote:
> Hi,
> I have a question about work queue.
> I use queue_work() function in my TTY driver's write function
> (ch_tty_write()).
> The TTY driver works fine,but when this driver is called from
> ppp_write() function system would crash.
>
> static
Hi!
On 11:40 Tue 15 Nov , Kai Meyer wrote:
> On 11/15/2011 11:13 AM, mic...@michaelblizek.twilightparadox.com wrote:
...
> > You might want to take a look at wait queues (the kernel equivalent to
> > pthread
> > "condidions"). Basically you instead of calling msleep(), you call
> > wait_event
Hi!
On 12:15 Mon 14 Nov , Kai Meyer wrote:
...
> My
> caller function has an atomic_t value that I set equal to the number of
> bios I want to submit. Then I pass a pointer to that atomic_t around to
> each of the bios which decrement it in the endio function for that bio.
>
> Then the ca
Hi!
On 19:45 Sat 15 Oct , amit mehta wrote:
...
> Now in step 4 above, driver passes this packet to the
> network layer by calling netif_receive_skb() which may return
> NET_RX_DROP (packet was dropped), but most
> (I checked some of the network driver code) of the network
> drivers do not do thi
Hi!
On 16:29 Sat 15 Oct , tao jiang wrote:
> michi:
>
> 1.
> Is that to create two sockets
> and one bind to 10.0.0.1 the other bind to 10.0.0.2
> then use epoll wait these two sockets ?
Yes, exactly.
> 2.
> Is there any way to find out the turple like TCP
> then the UDP server can reply wi
Hi!
On 01:51 Sat 15 Oct , jiangtao.jit wrote:
> Hi:
>
> I'm writing a UDP server and meet a problem
> the UDP server program is run on a box with single card but has multi ip:
> likeeth010.0.0.1
> eth0:1 10.0.0.2
> eth0:2 11.0.0.1
>
> I bind the
Hi!
On 20:47 Thu 13 Oct , Richard Weinberger wrote:
> Am 13.10.2011 20:10, schrieb mic...@michaelblizek.twilightparadox.com:
> > After migrating from i386 to x86_64, my uml started to segfault in weird
> > ways.
>
> What exactly is the problem?
> Without any details nobody can and will help you.
Hi!
After migrating from i386 to x86_64, my uml started to segfault in weird ways.
In the end, I figured that "make clean/mrproper/distclean" does not really
clean up properly. I had to use "ARCH=um make distclean". The command "make
distclean" did not remove these files:
arch/um/include/shared/k
Hi!
On 17:25 Wed 12 Oct , mic...@michaelblizek.twilightparadox.com wrote:
...
> 3) Sometimes UML is a real pain. When I upgrade my testing kernel, I usually
>have to spend some time searching the internet for fixes. I do not remember
>this error, tough. You can find my current (3.0) ke
Hi!
On 19:15 Wed 12 Oct , jiangtao.jit wrote:
> Hi:
>
> Need help with UML issue
>
> 1.is User Mode Linux still supported?
I think so
> 2.where can I find the latest Docs and guidelines?
I usually refer to http://user-mode-linux.sourceforge.net/old/index.html . It
probably is not really t
Hi!
On 19:52 Sun 09 Oct , Parmenides wrote:
> 2011/10/9 Daniel Baluta :
> > On Sat, Oct 8, 2011 at 7:19 PM, Parmenides
> > wrote:
> >
> > Well, I think that if task B has higher priority than task A, then A would
> > never have the chance to release the lock.
> >
>
> Hmm...! Does that mean
Hi!
On 23:53 Sat 08 Oct , Dave Hylands wrote:
> Hi Michi,
>
> On Sat, Oct 8, 2011 at 11:29 PM, Michael Blizek
> wrote:
...
> > Disabling interrupts actually disables preemption as well. Preemption is
> > triggered by a timer interrupt, which cannot arrive in this case. Spinlocks
> > can be a
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