From: Paolo Bonzini <pbonzini@redhat.com>
To: Chris Friesen <chris.friesen@windriver.com>, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] virtio-serial-pci very expensive during live migration
Date: Wed, 07 May 2014 08:39:00 +0200 [thread overview]
Message-ID: <5369D504.2070101@redhat.com> (raw)
In-Reply-To: <53693FA4.3000306@windriver.com>
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
next prev parent reply other threads:[~2014-05-07 6:39 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-06 20:01 [Qemu-devel] virtio-serial-pci very expensive during live migration Chris Friesen
2014-05-07 5:58 ` Markus Armbruster
2014-05-07 6:39 ` Paolo Bonzini [this message]
2014-05-07 22:25 ` Chris Friesen
2014-05-08 13:02 ` Amit Shah
2014-05-08 13:14 ` Paolo Bonzini
2014-05-08 13:30 ` Amit Shah
2014-05-08 13:36 ` Paolo Bonzini
2014-05-08 13:47 ` Amit Shah
2014-05-08 15:40 ` Chris Friesen
2014-05-09 0:53 ` Chris Friesen
2014-05-09 8:19 ` Paolo Bonzini
2014-06-19 15:19 ` Chris Friesen
2014-06-19 15:31 ` Paolo Bonzini
2014-05-08 14:31 ` Chris Friesen
2014-05-08 14:34 ` Paolo Bonzini
2014-05-08 15:57 ` Chris Friesen
2014-05-08 16:02 ` Paolo Bonzini
2014-05-08 20:57 ` Chris Friesen
2014-05-09 1:44 ` ChenLiang
2014-05-09 3:31 ` Chris Friesen
2014-05-08 2:54 ` Gonglei (Arei)
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