Re: [Qemu-ppc] Adding canyonlands/460EX support to QEMU in qemu-system-ppc

[Alexander Graf]

On 02/26/2013 06:06 PM, Allen Kneser wrote:
> Hi Alexander,
>
> I used the --enable-profiler switch in ./configure, booted Linux and 
> then executed "info profile" and "info jit" and was able to get some 
> numbers, perhaps you can take a look.
>
> =======================================
> (qemu) info profile
> async time  441278495527 (441.278)
> qemu time   373681012679 (373.681)
> (qemu) info jit
> Translation buffer state:
> gen code size       27939072/134093824
> TB count            113121/1048568
> TB avg target size  17 max=1204 bytes
> TB avg host size    246 bytes (expansion ratio: 13.7)
> cross page TB count 0 (0%)
> direct jump count   64225 (56%) (2 jumps=47630 42%)
>
> Statistics:
> TB flush count      0
> TB invalidate count 26864
> TLB flush count     3183996
> JIT cycles          1661534016 (0.692 s at 2.4 GHz)
> translated TBs      113121 (aborted=0 0.0%)
> avg ops/TB          22.9 max=451
> deleted ops/TB      6.33
> avg temps/TB        178.98 max=186
> cycles/op           640.4
> cycles/in byte      816.3
> cycles/out byte     61.4
>   gen_interm time   13.5%
>   gen_code time     86.5%
> optim./code time    384.6%
> liveness/code time  157.3%
> cpu_restore count   592305
>   avg cycles        20330.4
>
> 3,183,996 TLB flushes seems like a big number to me.

Yeah, I do know that we do too many flushes. The thing I don't know yet 
is how to solve it :).


Alex