On Wed, 2005-10-19 at 00:34 +0400, Brad Campbell wrote: > After re-installing windows 2000 SP3 & SP4 about 25 times on different > machines, its looking wierd.. > SP4 has a problem when configuring COM+ with no kqemu, but works fine with > kqemu on all 3 machines > (PIII, Sempron 2400+ Athlon XP 2800+).
kqemu avoids emulating instructions, so the instructions run natively. So, this would seem to imply an issue in the (software) cpu emulation (that is, in the situation with no kqemu). It would rule out the system emulation (ancillary hardware) since the system emulation is the same in both cases w/ and w/out kqemu. > Any Win2k SP3 or SP4 image created on the Athlons will not boot on the PIII, > but an image created on > the PIII seems to boot fine on all the machines.. AFAIK qemu doesn't implement Athlon extensions. So this is not surprising if your theory is true. W/ kqemu would not work since it will try to run Athlon instructions natively on a Pentium. w/out kqemu would not work assuming qemu doesn't implement Athlon extensions in the cpu emulation. > Now to top it off, I have actually used identical qemu binaries on all the > machines. Compiled on the > PIII and copied to the Athlons, in addition to locally compiled copies... I'm > using a vanilla qemu > CVS with the DMA and Concurrent IO Patches. I have yet to remove those > patches and try again.. it > just keeps on getting stranger. > Strange? I'm not surprised that Athlon-only intructions do not run on Pentium machines. It would be nice if qemu+kqemu could detect this circumstance, but you've determined the obvious workaround: install OSes that optimize themselves for specific x86 variant on install to a lowest-common-denominator host under kqemu, or on an arbitrary host under no-kqemu. > Problem has been worked around by creating the whole image on the laptop. Now > it works anywhere, but > I'm baffled as to why the images created on the Athlons won't boot on the > laptop. > Anyway everything seems to be fitting your theory about Athlon extensions. It would be nice to catch it in the act of trying to run an Athlon instruction on a Pentium. -- John. _______________________________________________ Qemu-devel mailing list Qemu-devel@nongnu.org http://lists.nongnu.org/mailman/listinfo/qemu-devel
