Re: [Qemu-devel] A question about QEMU performance
On Wednesday 27 September 2006 4:27 am, Martin Guy wrote: There are some statistics at freaknet.org/martin/QEMU for various types of x86 processor, but giving only BogoMIPS, which are way overrated. I presume this is cos QEMU translates the kernel speed test loop once then runs it as x86 code, while real tasks need to be translated all the time. There is a cache of translated pages, and last I checked (0.8.0 or so) the entire translation cache was flushed when it filled up, rather than trying to do any kind of LRU-style thing. I think of qemu as a processor with a bigger than normal penalty for faulting executable pages from DRAM into L2. :) Rob -- Perfection is reached, not when there is no longer anything to add, but when there is no longer anything to take away. - Antoine de Saint-Exupery ___ Qemu-devel mailing list Qemu-devel@nongnu.org http://lists.nongnu.org/mailman/listinfo/qemu-devel
Re: [Qemu-devel] A question about QEMU performance
If I run qemu for i386 without kqemu it uses soft-mmu, so it operates as another architetture as ppc or mips right? So... are the performace of qemu the same if I use i386 or mips or something change deeply? Example: if I run the same program on i386 emulation without kqemu or on mips are the performance circa the same? Would you expect qemu to perform the same on an AMD 4600X2 as a 400 Mhz MIPS? There are some statistics at freaknet.org/martin/QEMU for various types of x86 processor, but giving only BogoMIPS, which are way overrated. I presume this is cos QEMU translates the kernel speed test loop once then runs it as x86 code, while real tasks need to be translated all the time. The only concrete figures I have are from when I timed the running of bash's configure script, which causes a lot of program execution as well as compiling and running lots of short test programs. The results are in cluster.aleph1.co.uk/~martin/qemu.html (please ignore the other garbage on that page!) M ___ Qemu-devel mailing list Qemu-devel@nongnu.org http://lists.nongnu.org/mailman/listinfo/qemu-devel
Re: [Qemu-devel] A question about QEMU performance
There are some statistics at freaknet.org/martin/QEMU for various are in cluster.aleph1.co.uk/~martin/qemu.html (please ignore the other Sorry, that first page is bogus. I meant the second. M ___ Qemu-devel mailing list Qemu-devel@nongnu.org http://lists.nongnu.org/mailman/listinfo/qemu-devel
[Qemu-devel] A question about QEMU performance
Hi all,This is my question:If I run qemu for i386 without kqemu it uses soft-mmu, so it operates as another architetture as ppc or mips right?So... are the performace of qemu the same if I use i386 or mips or something change deeply? Example: if I run the same program on i386 emulation without kqemu or on mips are the performance circa the same?ThanksAle ___ Qemu-devel mailing list Qemu-devel@nongnu.org http://lists.nongnu.org/mailman/listinfo/qemu-devel
Re: [Qemu-devel] A question about QEMU performance
Alessandro Corradi [EMAIL PROTECTED] wrote: Hi all, This is my question: If I run qemu for i386 without kqemu it uses soft-mmu, so it operates as another architetture as ppc or mips right? So... are the performace of qemu the same if I use i386 or mips or something change deeply? Example: if I run the same program on i386 emulation without kqemu or on mips are the performance circa the same? Would you expect qemu to perform the same on an AMD 4600X2 as a 400 Mhz MIPS? It's probably all relative to the speed of the cpu, host OS, compiler optimizations and trans cpu data transforms, as to how well the emulated system performs. ___ Qemu-devel mailing list Qemu-devel@nongnu.org http://lists.nongnu.org/mailman/listinfo/qemu-devel
