01-01-2009
A server installation might allow you to use all the RAM but if this is not ideal for a desktop system because the kernel would not be preemptive.
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
I wish to install Red Hat linux 7.1 on a machine with 16mb of EDO Ram. When I enter the instalation process I am told 'You do not have enough memory'. Is there a way to install RHL with only the 16? Or will I have to upgrade and buy some very expensive EDO.
~ Paul (3 Replies)
Discussion started by: KrazyGuyPaul
3 Replies
2. Debian
Hello all
i own p100 16ram laptop , i would like to run linux on it
i need it for gcc compilation and shell scripting , no gui.
what version of linux should i install , i dont mind to install old one .
tnx allot (5 Replies)
Discussion started by: umen
5 Replies
3. Solaris
What command should I be using on Solaris 9 to get an accurate representation of the available physical RAM? (4 Replies)
Discussion started by: dangral
4 Replies
4. Shell Programming and Scripting
Hi Gurus,
Can someone let me know how to find the RAM size,ROM size and Number of processors for a linux server.
Version :Linux 2.4.9-e.57smp
Also what does "e.57smp" stands for?
Thanks in advance gurus.....
cheers. (3 Replies)
Discussion started by: navojit dutta
3 Replies
5. Solaris
Hi All,
I am trying to find the physical memory usage by each process/users.
Can you please let me know how to get the memory usage?.
Thanks,
bsraj. (12 Replies)
Discussion started by: bsrajirs
12 Replies
6. Solaris
I have a Sun T5120, and I want to programmatically determine how much RAM it has.
# uname -a
SunOS myhost 5.10 Generic_141444-09 sun4v sparc SUNW,SPARC-Enterprise-T5120
The box has 64Gb; I tried prtdiag and prtconf, but they give me bogus info
prtconf gives me:
# prtconf |grep -i... (12 Replies)
Discussion started by: thomn8r
12 Replies
7. Cybersecurity
void main() {
long ((long)(&array));
int x;
for (;;)
{
(array) =+ 1023;
printf("%c", array);
}
}
What is wrong with this code to print Linux RAM? (13 Replies)
Discussion started by: Alux
13 Replies
8. Red Hat
Hi,
I have a server (BL460c) with 32G of physical RAM.
It currently only uses approx 5% its capacity but will use more (not sure how much more) pending the launch of further applications.
If I need to build another node of similar functionality should I consider downgrading the physical... (2 Replies)
Discussion started by: Duffs22
2 Replies
9. Solaris
Hi,
kstat -p -m zfs -n arcstats -s size returns
zfs:0:arcstats:size 8177310584
this values is approx (7.61 GB)
but my Physical Memory size is only 6144 Megabytes.
Can this happen ?
if yes, then how can I find free memory on the system.
BTW, I ran the kstat commands from a Non... (2 Replies)
Discussion started by: sapre_amit
2 Replies
10. Red Hat
Dear Expert,
I 've installed Redhat linux AS3, My machine having Inbuild network card (Intel(R) 82566DM-2 Gigabit Network Connection).
I've downloaded e1000e-2.3.2 from Intel site, but its not working for my machine. I'm unable to configure the Network.
ifconfig eth0 xx.xx.xx.xx netmask... (0 Replies)
Discussion started by: Mohammed Faiz
0 Replies
bcopy(9F) Kernel Functions for Drivers bcopy(9F)
NAME
bcopy - copy data between address locations in the kernel
SYNOPSIS
#include <sys/types.h>
#include <sys/sunddi.h>
void bcopy(const void *from, void *to, size_t bcount);
INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI).
PARAMETERS
from Source address from which the copy is made.
to Destination address to which copy is made.
bcount The number of bytes moved.
DESCRIPTION
bcopy() copies bcount bytes from one kernel address to another. If the input and output addresses overlap, the command executes, but the
results may not be as expected.
Note that bcopy() should never be used to move data in or out of a user buffer, because it has no provision for handling page faults. The
user address space can be swapped out at any time, and bcopy() always assumes that there will be no paging faults. If bcopy() attempts to
access the user buffer when it is swapped out, the system will panic. It is safe to use bcopy() to move data within kernel space, since
kernel space is never swapped out.
CONTEXT
bcopy() can be called from user or interrupt context.
EXAMPLES
Example 1: Copying data between address locations in the kernel:
An I/O request is made for data stored in a RAM disk. If the I/O operation is a read request, the data is copied from the RAM disk to a
buffer (line 8). If it is a write request, the data is copied from a buffer to the RAM disk (line 15). bcopy() is used since both the RAM
disk and the buffer are part of the kernel address space.
1 #define RAMDNBLK 1000 /* blocks in the RAM disk */
2 #define RAMDBSIZ 512 /* bytes per block */
3 char ramdblks[RAMDNBLK][RAMDBSIZ]; /* blocks forming RAM
/* disk
...
4
5 if (bp->b_flags & B_READ) /* if read request, copy data */
6 /* from RAM disk data block */
7 /* to system buffer */
8 bcopy(&ramdblks[bp->b_blkno][0], bp->b_un.b_addr,
9 bp->b_bcount);
10
11 else /* else write request, */
12 /* copy data from a */
13 /* system buffer to RAM disk */
14 /* data block */
15 bcopy(bp->b_un.b_addr, &ramdblks[bp->b_blkno][0],
16 bp->b_bcount);
SEE ALSO
copyin(9F), copyout(9F)
Writing Device Drivers
WARNINGS
The from and to addresses must be within the kernel space. No range checking is done. If an address outside of the kernel space is
selected, the driver may corrupt the system in an unpredictable way.
SunOS 5.10 4 August 2003 bcopy(9F)