Re: 5.0.0-rc3 : Opcode 1f 12 0f 00 (7ce003e4) leaked temporaries

[BALATON Zoltan]

On Fri, 17 Apr 2020, Peter Maydell wrote:
> On Fri, 17 Apr 2020 at 01:43, Dennis Clarke via <address@hidden> wrote:
> > Also I did compile qemu with --enable-debug --disable-strip and the
> > performance is truely horrific.  I can only assume that those options
> > are the cause. Any thoughts from anyone would be wonderful.
>
> Well, you turned on debug and you got some warnings
> which are only emitted with debug on, so you can
> work around it by not doing that :-) And yes, debug
> is slower (it builds QEMU without optimization enabled
> so it's easier to debug QEMU in gdb, and it turns on
> various extra sanity checks.)

Last time I've looked I've found it effectively disables TB cache (at 
least with PPC) because one of those checks forces a flush which is the 
main source of the slowness with --enable-debug. Not sure if this could be 
avoided, I didn't know about --disable-tcg-debug Philippe suggested so 
haven't tested that.

Regards,
BALATON Zoltan