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Hi Everybody, I am working on montavista linux, on broadcom chipset, mips processor...having 32Mb RAM..out of which top 2Mb has been given for DMA access..remaining 30Mb should be available. But ...
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- 10-26-2005 #1
- Join Date
- Oct 2005
Reducing the reserved memory for kernel
I am working on montavista linux, on broadcom chipset, mips processor...having 32Mb RAM..out of which top 2Mb has been given for DMA access..remaining 30Mb should be available. But in cat /proc/meminfo it only shows 26Mb free, in dmesg..it shows that 4.7Mb is reserved for kernel. That is far too much that i expect as I have heard it ahuld not be more than 2-3% of total memory. How to reduce it? I am having busybox utilities.
here is the output:
total: used: free: shared: buffers: cached:
Mem: 27181056 7303168 19877888 0 53248 5435392
Swap: 0 0 0
MemTotal: 26544 kB
MemFree: 19412 kB
MemShared: 0 kB
Buffers: 52 kB
Cached: 5308 kB
SwapCached: 0 kB
Active: 720 kB
Inactive: 4984 kB
HighTotal: 0 kB
HighFree: 0 kB
LowTotal: 26544 kB
LowFree: 19412 kB
SwapTotal: 0 kB
SwapFree: 0 kB
Committed_AS: 1056 kB
VmallocTotal: 1048560 kB
VmallocUsed: 448 kB
VmallocChunk: 1048112 kB
Setting memory region to 0x2000000
Environment  : <memsize=32>
5200 mem=30M ramdisk_size=8192 nfsroot=10.240.4.61:/home/canoop/target
U-BOOT Environment: bootargs = root=/dev/ram console=ttyS0,115200 mem=30M
memory: 02000000 @ 00000000 (usable)
memory: 01e00000 @ 00000000 (usable)
Kernel command line: yroot=/dev/ra console=ttyS0,115200 mem=30M
Memory: 25996k/30720k available (1474k kernel code, 4724k reserved, 92k data, 80k init, 0k
Disabling the Out Of Memory Killer
Freeing initrd memory: 466k freed
Freeing unused kernel memory: 80k freed
Theres also another instance where dmesg doent show reserved space for kernel. So, I am wondering without this reserved space, it can work.....I have to reduce the memory by 3Mb. Any suggestions?
Can I reduce the buffer cache, right now its almost 5.4Mb..I think that I can reduce by 1 Mb....any idea, how much effect will it have over perormance?
/*What my suspicion is: Does Montavista linux has some limitation abt the minimum reserved space?*/
- 06-17-2006 #2
- Join Date
- Jun 2006
first of all you shouls say me how can I find Montavista linux Sorce code?
I realy need it .