Am 29.03.2015 um 23:52 schrieb Richard Henderson:
On Mar 27, 2015 14:09, "Emilio G. Cota" <c...@braap.org> wrote:
On Fri, Mar 27, 2015 at 09:55:03 +0000, Alex Bennée wrote:
Have you been able to measure any performance improvement with these new
structures? In theory, if aligned with cache lines, performance should
improve but real numbers would be nice.
I haven't benchmarked anything, which makes me very uneasy. All
I've checked is that the system boots, and FWIW I appreciate no
difference in boot time.
No decrease in boot time is good. We /know/ we're saving memory, after all.
Is there a benchmark suite to test TCG changes?
No, sorry.
r~
Benchmarking TCG with QEMU's system emulation is nearly impossible
because operating systems usually contain lots of timer based operations.
The TCG interpreter for example is really slow, but a BIOS will boot
faster than expected with it.
The user mode emulation is much better for benchmarks.
Run some command line Linux application which mainly does
computations (not file i/o) using user mode emulation on Linux.
The OpenSSL package contains bntest which can be used
as a benchmark for TCG. Redirect all output to /dev/null when
you run it.
Binaries for i386 and x86_64 are available from
http://qemu.weilnetz.de/test/user/.
Stefan
