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| author | Ming Lei <ming.lei@canonical.com> | 2014-06-04 10:05:55 +0800 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2014-07-06 09:13:54 +0300 |
| commit | b7c9285b8d60d1b235a2ef03d48168d372367c5a (patch) | |
| tree | 785e368d7fed5a1460bbbd79a75e7044c5fd8602 /hw/core/qdev-properties-system.c | |
| parent | 22dc50d75838e83b4bb05ae5554728be9f266e87 (diff) | |
| download | focaccia-qemu-b7c9285b8d60d1b235a2ef03d48168d372367c5a.tar.gz focaccia-qemu-b7c9285b8d60d1b235a2ef03d48168d372367c5a.zip | |
hw/virtio: enable common virtio feature for mmio device
Both 'indirect_desc' and 'event_idx' are bus independent features,
and they should be enabled for mmio devices too.
On arm64 quad core VM(qemu-kvm), the patch can increase block I/O
performance a lot with latest linux tree:
- without the patch: 14K IOPS
- with the patch: 34K IOPS
fio script:
[global]
direct=1
bsrange=4k-4k
timeout=10
numjobs=4
ioengine=libaio
iodepth=64
filename=/dev/vdc
group_reporting=1
[f1]
rw=randread
Cc: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'hw/core/qdev-properties-system.c')
0 files changed, 0 insertions, 0 deletions