On 12/29/2011 06:07 PM, Dor Laor wrote: > On 12/26/2011 11:05 AM, Avi Kivity wrote: >> On 12/26/2011 05:14 AM, Nikunj A Dadhania wrote: >>>> >>>> btw you can get an additional speedup by enabling x2apic, for >>>> default_send_IPI_mask_logical(). >>>> >>> In the host? >>> >> >> In the host, for the guest: >> >> qemu -cpu ...,+x2apic >> > > It seems to me that we should improve our default flags. > So many times users fail to submit the proper huge command-line > options that we require. Honestly, we can't blame them, there are so > many flags and so many use cases its just too hard to get it right for > humans. > > I propose a basic idea and folks are welcome to discuss it: > > 1. Improve qemu/kvm defaults > Break the current backward compatibility (but add a --default- > backward-compat-mode)
This exists, -M pc-1.0. > and set better values for: > - rtc slew time > - cache=none > - x2apic, maybe enhance qemu64 or move to -cpu host? We tried this for 1.0, but it caused regressions. Need to try again for 1.1. > - aio=native|threads (auto-sense?) > - use virtio devices by default Can't install non-Linux guests. > - more? > > Different defaults may be picked automatically when TCG|KVM used. -- error compiling committee.c: too many arguments to function
