dear everybody,
i am trying to compress/decompress ip packets.
for this i have implemented the adaptive lzw compression.
i put the code in the ip_output.c and do my compression/decompression
just before the if_output() function call so that i won't interfere with
the ip processing of the kernel.
> > for my compression/decompression i use string
> tables and temporary
> > buffers which take about 14KB of memory per
> packet.
>
> If you're allocating 14 KB of data just to send
> (approximately) 1.4 KB
> and then you throw away the 14 KB immediately, it
> sounds terrible.
yes that's true.
dear all,
i am written code for compression/decompression
which works very fine for binary as well as the
ascii data.
i have put the routine just before the
if_output() so that i do not interfere with
the kernel ip operations.
Now the compression/decompression works fine most
of the times bu
crash dumps here that may help
some of you suggest me whether there is anything i
can possibly do in order to solve this panic.
Is the problem related to memory leaks or sleeping
on mutexes or some other causes.
i have added my function just before the
IFQ_HANDOFF().
thanks,
kam
hanks,
kamal
Xin LI <[EMAIL PROTECTED]> wrote: Hi,
On 12/25/05, kamal kc wrote:
[...]
> Is the problem related to memory leaks or sleeping
> on mutexes or some other causes.
>From the backtrace you have provided, it looks like a memory
corruption. In order to aid your debu
dear everybody,
i want to use the routine get_system_info() to get the
load
averages of the cpu. i found it that top uses it.
but i do not know which object files do i need to link
it to
my program. also the struct system_info is defined
in the machine.h of the /usr/src/contrib/top. do i
need
t
> On Mon, 2006-Jan-09 19:14:53 -0800, kamal kc wrote:
> >i want to use the routine get_system_info() to get
> the
> >load averages of the cpu. i found it that top uses
> it.
>
> The approved mechanism is via the sysctl(3) name
> "vm.loadavg" or OID
>
--- Dan Nelson <[EMAIL PROTECTED]> wrote:
> In the last episode (Jan 09), kamal kc said:
> > dear everybody,
> >
> > i want to use the routine get_system_info() to get
> the load averages
> > of the cpu. i found it that top uses it.
>
> get_system_info
--- Peter Jeremy <[EMAIL PROTECTED]> wrote:
> On Mon, 2006-Jan-09 23:59:10 -0800, kamal kc wrote:
> >thanks i tried getloadavg() it worked.
> >
> >but when i tried to put it in the kernel the kernel
> > failed to link.
>
> You didn't mention the kern
--- Tofik Suleymanov <[EMAIL PROTECTED]> wrote:
> kamal kc wrote:
>
> >--- Peter Jeremy <[EMAIL PROTECTED]>
> wrote:
> >>>thanks i tried getloadavg() it worked.
> >>>
> >>>but when i tried to put it in the kernel the
> kernel
dear everybody,
i had previous thread going on about the cpu load
average. and had some discussion regarding it. i have
a newer thing to discuss on so i started this thread.
as i mentioned earlier i had put some code in the
bridge.c
that performed compression which took a long time and
hence
i
--- John Baldwin <[EMAIL PROTECTED]> wrote:
> >
> > the man page discussed the swi_add() and
> swi_sched()
> > functions.
> >
> > what i don't understand is, how do i register my
> > handler
> > function ??
> > if i use the swi_add() for that purpose what
> > do i use for the void *arg argument.
--- John Baldwin <[EMAIL PROTECTED]> wrote:
> > the man page discussed the swi_add() and
> swi_sched()
> > functions.
> >
> > what i don't understand is, how do i register my
> > handler
> > function ??
> > if i use the swi_add() for that purpose what
> > do i use for the void *arg argument.
> >
--- kamal kc <[EMAIL PROTECTED]> wrote:
> >
> > Queue a task to a taskqueue. Behind the scenes
> that
> > will invoke a swi_add if
> > you use the taskqueue_swi queue. However, given
> > that you want to do some
> > rather complicated work,
--- John Baldwin <[EMAIL PROTECTED]> wrote:
> On Thursday 12 January 2006 06:19 am, kamal kc
> wrote:
> > --- kamal kc <[EMAIL PROTECTED]> wrote:
> > > > Queue a task to a taskqueue. Behind the
> scenes
> > >
> > > that
> > >
dear all,
i created a kernel daemon thread using the SYSINIT().
i want that daemon thread to do more cpu
intensive tasks and that's why
i want to give it more cpu time.
my daemon thread get a priority of -84 and
a nice value of 0.
i guess when the nice value is 0 it affects
its scheduling.
does anybody know what is the best way
to start kernel hack.
Any references to any web page would
be appreciated
__
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http://mail.yahoo.com
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freebsd-hac
this may be a trivial question for many of you
but i am confused in doing memory allocation in the
kernel.
sys/malloc.h has function prototypes for malloc()
kern/kern_malloc.c defines the malloc()
the malloc() definition is
void *
malloc(size, type, flags)
unsigned long size;
st
> > sys/malloc.h has function prototypes for malloc()
> > kern/kern_malloc.c defines the malloc()
> >
> > the malloc() definition is
> >
> > void *
> > malloc(size, type, flags)
> > unsigned long size;
> > struct malloc_type *type;
> > int flags;
> >
> > i understand the size and fla
i come across this unusual problem.
i changed the ip_tos field of the struct ip and
computed
the checksum by using in_cksum().
when the packet uses only one mbuf the computed
checksum is ok but when the packet uses more than one
mbuf then the computed checksum is wrong.
eg. pinging with payloa
> > i changed the ip_tos field of the struct ip and
> computed the checksum
> > by using in_cksum().
> >
> > when the packet uses only one mbuf the computed
> checksum is ok but
> > when the packet uses more than one mbuf then the
> computed checksum is
> > wrong.
>
> Note that the IP header conta
> > void copy_the_memorybuffer(struct mbuf **m)
> > {
> >struct mbuf *mbuf_pointer=*m;
> >struct mbuf **next_packet;
> >
> >next_packet=&mbuf_pointer;
> >
> >struct ip *my_ip_hdr;
> >my_ip_hdr=mtod((*next_packet),struct ip *);
> >my_ip_hdr->ip_tos=64;
> >my_ip_hdr->ip_s
> > void copy_the_memorybuffer(struct mbuf **m)
> > {
> >struct mbuf *mbuf_pointer=*m;
> >struct mbuf **next_packet;
> >
> >next_packet=&mbuf_pointer;
> >
> >struct ip *my_ip_hdr;
> >my_ip_hdr=mtod((*next_packet),struct ip *);
> >my_ip_hdr->ip_tos=64;
> >my_ip_hdr->ip_s
hello everybody,
i am new to kernel programming.
i am developing a compression/decompression
functionality in the ip layer.
i want to compile the kernel faster.
it would
be ok if the kernel doesn't have support for sound
devices, or other devices like scsi,usb etc. because
i would be using the
dear all,
i have put sshd_enable="YES"
and inetd_enable="YES"
in /etc/rc.conf.
netstat -an also shows that the port numbers
21 and 22 are in listen state
ftp is uncommented in /etc/inetd.conf
but still the ssh/ftp services does not work.
when i ftp from another computer the netstat
shows conne
dear all,
i have to make modifictions to the kernel and
i have been encountering kernel crashes all the
time.
the kernel panics with messages starting with
vm_fault: and then crashes and reboots.
i guess i have done incorrect memory operations and
i want to know where i went wrong.
so i thou
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