Tim Olson wrote:
I am using qemu 0.8.2 built from source. In the qemu technical
documentation for features under full system emulation, it says:
"QEMU can either use a full software MMU for maximum portability or
use the host system call mmap() to simulate the target MMU."
However, I cannot find a way to build a full system simulator which
does not define SOFTMMU -- in fact, the configure parameters
"--disable-system" and "--enable-system" directly control the softmmu
switch. There are some mmap() calls in the kqemu code, but to use
that requires full kqemu support code in the kernel.
I think there is a big performance hit using the software mmu, as each
target load or store instruction is expanded into 20-30 host
instructions to perform the translation. Is there a way to build the
qemu-system-* emulators using the mmap() feature mentioned in the
documentation?
-- Tim Olson
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Can someone elaborate on this a little? What is the difference between
the SOFTMMU and the mmap()? Should I be using the --enable-system or
the --disable-system for win32 guest on i386 debian host? Can someone
give a little more insight on this technicality?
-Joseph
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