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The Wednesday 2007-12-05 at 22:35 +0100, jdd wrote:
Carlos E. R. wrote:
> If swap is a major issue you've clearly not got enough RAM ;)
Swap is not a major issue; I didn't say that. What we are saying is that
loss of swap when there is something swapped IS a major issue.
what this remark may me think is this: is the swap really identical to ram
(functionally, of course, ne speed involved).
Mmm...!
if so, is the ram more important (or less) than Hard drive? Is the ram loss
more problematic? Is it more prone to happen? what do you do is your memory
chip fails?
Ram loss will probably panic the kernel instantly. Worse, not only it can
corrupt programs and data in memory, it can also corrupt disk data which
is buffered in memory and written to disk... (it is worse for filesystems
like xfs). So, the traditional response to a ram failure has been to panic
and halt the computer immediately. I'm not sure what linux does, though.
Typically, PCs ram was 9 bit wide: 8 bit for data, one for parity. A
parity error, crash! I think there was (is?) an IRQ dedicated to this
condition. Some memory modules did not have this extra bit and were
thus cheaper.
But you can use more bits per byte and use error correction codes to
recover 1 bit error (or more) and continue working. Also, the cpu could
map out a section that's known to be bad or failing.
- --
Cheers,
Carlos E. R.
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