Huge interrupt overhead reported after RAM added to
brett at lariat.net
Mon Sep 5 01:11:46 UTC 2011
At 05:33 PM 9/4/2011, Robert Bonomi wrote:
>Does sound sorta-like VM thrashing.
>Could it be hardware based _bank-switching_ on memory?
>This would cause an intterrupt every time successive memory accesses were in
Indeed. In fact, when you put in a 4GB module, the BIOS reports
that you have 1GB of "4GB+ memory" (a possible indication that the
last gigabyte is mapped into some special space). Maybe there's
something like PAE going on. Anyone know what might be up? (Copying
this message back to the list thread)
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