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On Thursday 17 January 2013 05:43:09 Kfir Lavi wrote: |
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> I just killed some processes and arrived to bare system 64MB. |
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> Now just sshd, bash and agetty are showing in ps aux as real processes. |
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> The other are kernel processes. |
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> The kernel is pretty lean. Should I expect 64MB as the initial system |
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> memory use? |
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> Can I lower it? |
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you have to look at where exactly memory is being used |
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when the kernel boots, it very clearly tells you what it is using as a |
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starting point. in dmesg, look for the line starting with "Available:". |
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from there, run `ps auxOR`. the VSZ/RSS fields will tell you how much memory |
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each process is using (be aware that some of it is shared e.g. glibc shared |
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libs). |
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then look at /proc/meminfo and see what is being used where. |
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i'm assuming your system is booting off a real rootfs (e.g. not an initramfs) |
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so usage there shouldn't be a big problem. |
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with that information, you can see what can be shrunk or what is unavoidable. |
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FWIW, i built Blackfin systems w/16MiB of RAM fairly easily. but those used |
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uClibc and busybox (and dropbear for ssh). while much of userland was built |
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with -Os, the kernel and uClibc were built with -O2 as the space/optimization |
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tradeoffs didn't seem worth it. |
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-mike |
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