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 >
Can you capture ftraces of io-thread enabled & disabled runs? They just need to cover a hand full of frames. Thanks, Jan
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