@corona, thanks that was a relief. I logged a case with RHEL just in case and they told me the same thing you did but in totally incomprehensible terms
@mark, thanks for the vmstat syntax. I suppose cat /proc/meminfo provided me with more or less the same info
@murphy, I did check the link you provided but I got lost halfway thru I think I was just too stressed to figure it out yesterday!
Anyways, just in case someone comes across this thread and wants answers, following is the math concoction:
Code:
For example (Units are in megabytes):
# free -m
total used free shared buffers cached
Mem: 1000 900 100 0 350 350
-/+ buffers/cache: 200 800
In this example, as far as applications are concerned the system is using only 200MB of memory and has 800MB free and available for use if needed.
Note: in this example,
Total Physical Memory = 1000 M
Physically Used Memory = 900 M
Actual used memory = 200 M
buffers = 350 M
cached = 350 M
Physically Free Memory = 100 M
Memory free for Applications = 800 M
The items to note here are:
<Physically Used Memory> = <Actual used memory> + <buffers> + <cache> = 200 + 350 + 350 = 900 M
<Physically Free Memory> = <Total Physical Memory> - <Actual used memory> - <buffers> - <cache> = 1000 - 200 - 350 - 350 = 100 M
<Memory free for Applications> = <Total Physical Memory> - <Actual used memory> = 1000 - 200 = 800 M
<Memory used by Applications> = <Physically Used Memory> - <buffers> - <cache> = 900 - 350 - 350 = 200 M
Hy, I've an 486 dx2 laptop an I want to run unix on it, the problem is it has only 4 megabytes of ram, so my question is; does anybody know an unix based OS which runs with only 4 mb?
thanx (7 Replies)
Hi,
I am seeing very high kernel usage and very high load averages on my system (Although we are not loading much data to our database). Here is the output of top...does anyone know what i should be looking at?
Thanks,
Lorraine
last pid: 13144; load averages: 22.32, 19.81, 16.78 ... (4 Replies)
Hi All,
In my application malloc is returning NULL even though there is sufficient amount of free memory is available but swap memory is low.
Is this possible that, if free memory is high & swap memory is low, malloc will not be able to allocate memory & return NULL ?:)
Kindly look into... (5 Replies)
on the file Ftp'd from the mainframe ,do we have any UNIX command to replace mainframe low and values to space or null.
i tried using tr and it doesn't work ...
Thanks (1 Reply)
Is it possible to have a bash script pick the highest and lowest values of four variables? I've been googling for this but haven't come up with anything. I have a script that assigns variables ($c0, $c1, $c2, and $c3) based on the coretemps from grep/sed statements of sensors. I'd like to also... (5 Replies)
Hi guys,
i have a question about spliting a binary file into 2 chunks.
First chunk with all high bytes and the second one with all low bytes.
What unix tools can i use? And how can this be performed?
I looked in manpages of split and dd but this does not help.
Thanks (2 Replies)
I've got a domain running on a few boards of a 25k. I'm seeing very high kernel cpu usage in top and cant' quite explain it. System runs a large number of smallish Oracle 10g2 databases (30), used mainly for development.
load average: 36.63, 36.68, 37.42
2489 processes: 2452 sleeping, 21... (0 Replies)
Need some clarification on this....
1. how are kernel/ user spaces and high/low memory related?
2. What do they all mean when i have the kernel command line as:
"console=ttyS0,115200 root=/dev/sda2 rw mem=exactmap memmap=1M@0 memmap=96M@1M irqpoll"
or
2. what do mem and memmap mean in... (3 Replies)
Hello All
I have a system running AIX 61 shared uncapped partition (with 11 physical processors, 24 Virtual 72GB of Memory) .
The output from NMON, vmstat show a high run queue (60+) for continous periods of time intervals, but NO paging, relatively low I/o (6000) , CPU % is 40, Low network.... (9 Replies)
Discussion started by: IL-Malti
9 Replies
LEARN ABOUT NETBSD
an
AN(4) BSD Kernel Interfaces Manual AN(4)NAME
an -- Aironet 4500/4800 and Cisco 340/350 series wireless network driver
SYNOPSIS
an* at pcmcia? function ?
an* at pci? dev ? function ?
an* at isapnp?
DESCRIPTION
The an driver provides support for Aironet Communications 4500/4800 and Cisco Aironet 340/350 series wireless network adapters. This
includes the ISA, PCI and PCMCIA varieties. The 4500 series adapters operate at 1 and 2Mbps while the 4800 series and 340/350 series can
operate at 1, 2, 5.5 and 11Mbps. The ISA, PCI and PCMCIA devices are all based on the same core PCMCIA modules and all have the same pro-
gramming interface, however unlike the Lucent WaveLAN/IEEE cards, the ISA and PCI cards appear to the host as normal ISA and PCI devices and
do not require any PCMCIA support.
The PCMCIA Aironet cards require PCMCIA support. ISA cards can either be configured to use ISA Plug and Play or to use a particular I/O
address and IRQ by properly setting the DIP switches on the board. (The default switch setting is for plug and play.) The an driver has
Plug and Play support and will work in either configuration, however when using a hard-wired I/O address and IRQ, the driver configuration
and the NIC's switch settings must agree. PCI cards require no switch settings of any kind and will be automatically probed and attached.
All host/device interaction with the Aironet cards is via programmed I/O. The Aironet devices support 802.11 and 802.3 frames, power manage-
ment, BSS (infrastructure) and IBSS (ad-hoc) operation modes. The an driver encapsulates all IP and ARP traffic as 802.11 frames, however it
can receive either 802.11 or 802.3 frames. Transmit speed is selectable between 1Mbps, 2Mbps, 5.5Mbps, 11Mbps, or ``auto'' (the NIC automat-
ically chooses the best speed).
By default, the an driver configures the Aironet card to join an access point with an SSID of null string. For ad-hoc mode, in which sta-
tions can communicate among each other without the aid of an access point, the driver must be set using ifconfig(8).
For more information on configuring this device, see ifconfig(8) and ifmedia(4).
HARDWARE
Cards supported by the an driver include:
Aironet 4500 Series
Aironet 4800 Series
Cisco Aironet 340 Series
Cisco Aironet 350 Series
DIAGNOSTICS
an%d: init failed The Aironet card failed to come ready after an initialization command was issued.
an%d: failed to allocate %d bytes on NIC The driver was unable to allocate memory for transmit frames in the NIC's on-board RAM.
an%d: device timeout The Aironet card failed to generate an interrupt to acknowledge a transmit command.
SEE ALSO arp(4), ifmedia(4), netintro(4), ifconfig(8)HISTORY
The an device driver first appeared in FreeBSD 4.0, and then in NetBSD 1.6.
AUTHORS
The an driver was written by Bill Paul <wpaul@ee.columbia.edu>.
BSD December 13, 2000 BSD
04-16-2012
SOLVED
