Hi all,
Hi,
I want to use mmap as a means of doing IPC between
unrelated processes. I do *not* want the data to hit
the disk. So this is what I do :-
fd = open(file, O_RDWR);
p = mmap(fd, MAP_NOSYNC | MAP_SHARED);
mlock(p, len);
/* Whack around with shmem */
Now my question is , once I have
hi all,
i have a L440GX+ intel server motherboard running 2 P3. The motherboard
has an on-board scsi controller aic7896 (ahc0, ahc1). Additionally i
have added an "Adaptec 3950 scsi controller" board(ahc2, ahc3). When i
boot an uniprocessor kernel everything works fine. However when i boot a
mu
hi all,
i have a L440GX+ intel server motherboard running 2 P3. The motherboard
has an on-board scsi controller aic7896 (ahc0, ahc1). Additionally i
have added an "Adaptec 3950 scsi controller" board(ahc2, ahc3). When i
boot an uniprocessor kernel everything works fine. However when i boot a
mul
hi all,
I have been looking into the Tigon firmware code and i am totalyy
puzzled about this: there is no place in the code where
trp->local_mem_conf.rx_buf_consumer is incremented. (except in
h_mac_rx_comp_nohost() which is not called) The tigon documentation says
that it should be incremented b
hi all,
i have a question regarding mmap and file write. a file is mmap'ed and
data is written into the mapped region. now the same region is written.
(as shown below)
buf = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
.
. /* some data put in buf */
.
write(fd, buf, len);
now
hi all,
what does CPU0 in the STATE field of "top" mean. i am running a SMP
kernel. a process utilizes 99% of cpu and shows CPU0 in its STATE field.
thanx in advance
joy
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hi all,
Why cant pages in the PQ_CACHE queue be freed at interrupt time. as far
as i could see these pages are clean, though they are still associated
with the object. So what prevents us from dissociating them from the
object . we dont have to do any io and hence not block.
well maybe i am miss
Dennis wrote:
> At 12:13 PM 6/1/00 -0600, Warner Losh wrote:
> >In message <[EMAIL PROTECTED]> Dennis writes:
> >: Have you done bus performance testing with this card? Given the
> >: architechture of the AMCC part, it seems highly improbable that you will be
> >: able to get high throughput with
hi all,
what is the significance of QUEUE_VMIO buffer (struct buf) queue ?? as
far as i could see they are not used at allbut maybe i am wrong.
thanx in advance
joy
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hi all,
i have a atm oc3 care which uses the amcc S5933 PCI adapter. however the
driver reports "unable to map mem" at boot time. i used pciconf to read
the configuration space base address registers and all of them showed
0x. however when i write all 1's t the base registers they give
me
hi all,
do disk addresses in struct dinode ( di_db[] array) address block
addresses or fragment addresses?? the comment in dinode.h says they are
block addresses. but fs.h says addresses are capable of addressing
fragments. will somebody please explain this??
thanx all
joy
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hi all,
i am working on a project to do a zero copy tranfer from a netwrok
buffer to a file. i need to know about buffer allocation in freeBSD. ive
read the source but there are a few queries:
i) what is meant by the B_MALLOC flag?? it seems if this flag is set the
buffers memory is malloced and
[EMAIL PROTECTED] wrote:
> > i have compiled freeBSD 3.4 SMP. but when i try to boot it the kernel
> > shows "Testing APIC 8254" and then it hangs. earlier i had run mptable
> > and it showed:I/O APICs:
> > --
> > {Lots of stuff}
> >
> > APIC ID Version State Ad
hi
i have compiled freeBSD 3.4 SMP. but when i try to boot it the kernel
shows "Testing APIC 8254" and then it hangs. earlier i had run mptable
and it showed:I/O APICs:
--
{Lots of stuff}
APIC ID Version State Address
2 0x20usable
hi all,
i tried to compile a SMP kernel . but when it tries to load the kernel
it gives me " undefined symbol" messages. the messages are:-
intr_machdep.o(.data+0xc0): undefined reference to `Xtsintr0'
intr_machdep.o(.data+0xc4): undefined reference to `Xtsintr1'
intr_machdep.o(.data+0xc8): unde
hi all
what does the flag OBJ_OPT mean?? i read it deals with some sort of IO
optimization. but i dont know what it actually does. any insights on
this??
thanx
joy
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Matthew Dillon wrote:
> :I am sorry that i missed this point in my previous post. well the problem with
> :the mmap is that my device does not have a buffer always. earlier the 'read'
> :ioctl on the device used to sleep till a buffer was available. what does the
> :mmap do?? can it block?? i am
hi
i have a buffer obtained from contigmalloc. now i want to mmap it to
user space. i have done this in linux but unfortunately i am a freebsd
newbie. i read the code and it appeared that the device mmap routine is
passed an offset and it has to return the physical page frame no so that
the neces
hi all
how to get a physical address from a kernel virtual address (the KVA is
obtained from contigmalloc() )
thanx in advance
-joy
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hi all
how to get a physical address from a kernel virtual address (the KVA is
obtained from contigmalloc() )
thanx in advance
-joy
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Matthew Dillon wrote:
>
> I think it would be a whole lot easier to implement mmap() on the
> device, then allow the user process to mmap() the device buffer
> and read() and write() it directly. I don't think you need to
> implement any ioctl's for this problem.
>
> fd = ope
Matthew Dillon wrote:
> I think it would be a whole lot easier to implement mmap() on the
> device, then allow the user process to mmap() the device buffer
> and read() and write() it directly. I don't think you need to
> implement any ioctl's for this problem.
>
> fd = open
Alfred Perlstein wrote:
> bcopy should be using the hand optimized code, I think you may have
> to explain more of what you're doing if anyone is going to be able
> to help.
well this is what i am doing:
i have a device buffer in contiguous physical memory. i want to write
that buffer into
a fi
Alfred Perlstein wrote:
> * Joy Ganguly <[EMAIL PROTECTED]> [000517 09:41] wrote:
> >
> > hi all,
> >
> > i have written a special ioctl which writes data into a file from a buffer in
> > kernel memory. it invokes fo->fo_write() and involves one
hi all,
i have written a special ioctl which writes data into a file from a buffer in
kernel memory. it invokes fo->fo_write() and involves one copy from kernel
mem
to disk cache. however this takes substantially more time than an ordinary
write which copies from user space to the disk cache. a
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