Hi,
> Subject: Re: [Qemu-devel] virtio-serial-pci very expensive during live > migration > > Il 06/05/2014 22:01, Chris Friesen ha scritto: > > > > It seems like the main problem is that we loop over all the queues, > > calling virtio_pci_set_host_notifier_internal() on each of them. That > > in turn calls memory_region_add_eventfd(), which calls > > memory_region_transaction_commit(), which scans over all the address > > spaces, which seems to take the vast majority of the time. > > Yes, you can wrap the entire loop with memory_region_transaction_begin > and memory_region_transaction_commit. Can you try that? > > Paolo We have discussed the issue before: https://lists.gnu.org/archive/html/qemu-devel/2014-03/msg00421.html According Paolo's advice, I have finished the patch and tested it work well. I will post the patch later. Best regards, -Gonglei
