On 2011-06-26 00:44, Andreas Färber wrote: > Am 25.06.2011 um 10:38 schrieb Jan Kiszka: > >> On 2011-04-13 22:16, Aurelien Jarno wrote: >>> On Mon, Apr 11, 2011 at 10:27:41PM +0200, Jan Kiszka wrote: >>>> These patches were posted before. They bring down the overhead of the >>>> io-thread mode for TCG here, specifically when emulating SMP. >>>> >>>> The major change in this version, besides rebasing, is the exclusion of >>>> KVM from the main loop polling optimization. >>>> >>>> >>>> >>>> Jan Kiszka (3): >>>> Do not drop global mutex for polled main loop runs >>>> Poll main loop after I/O events were received >>>> Do not kick vcpus in TCG mode >>>> >>>> cpus.c | 2 +- >>>> sysemu.h | 2 +- >>>> vl.c | 22 ++++++++++++++++------ >>>> 3 files changed, 18 insertions(+), 8 deletions(-) >>>> >>> >>> Thanks for working on improving the io-thread with TCG. Your patches >>> make sense, but they don't seems to fix the slowdown observed when >>> enabling the io-thread. Well maybe they were not supposed to. This is >>> for example the results of netperf between guest and host using virtio: >>> >>> no io-thread 122 MB/s >>> io-thread 97 MB/s >>> io-thread + patches 98 MB/s >>> >> >> Given that everyone seems to agree that these patches are a step into >> the right direction (for the current TCG locking architecture at least), >> can we please finally apply them? They do have positive impact in some >> use cases. If rebasing is required (I don't think so), just let me know. >> >> BTW, did you make any progress with tracing the remaining issues? > > I've tested these together with Paolo's fixes, but it still hangs on > Darwin. Doesn't appear to make it worse though.
http://thread.gmane.org/gmane.comp.emulators.qemu/106225 is still not merged. Jan
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