diff options
| author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2011-10-12 19:11:23 +0530 |
|---|---|---|
| committer | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2011-10-12 19:11:23 +0530 |
| commit | 5745e38afeaa15153c2209674fe37e1cbdd65707 (patch) | |
| tree | f3844615b308ad894b8a6d59c7605b77b8a261f4 /hw/virtio-pci.c | |
| parent | ebffe2afceb1a17b5d134b5debf553955fe5ea1a (diff) | |
hw/9pfs: Use ioeventfd for 9p
With ioeventfd:
[root@qemu-img-64 storage]# dd if=/dev/zero of=/storage/testx bs=8k count=131072 oflag=direct
131072+0 records in
131072+0 records out
1073741824 bytes (1.1 GB) copied, 26.767 s, 40.1 MB/s
Without:
[root@qemu-img-64 storage]# dd if=/dev/zero of=/storage/testx bs=8k count=131072 oflag=direct
131072+0 records in
131072+0 records out
1073741824 bytes (1.1 GB) copied, 65.3361 s, 16.4 MB/s
Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Diffstat (limited to 'hw/virtio-pci.c')
| -rw-r--r-- | hw/virtio-pci.c | 5 |
1 files changed, 0 insertions, 5 deletions
diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c index df27c198b0..ca5923c495 100644 --- a/hw/virtio-pci.c +++ b/hw/virtio-pci.c @@ -83,11 +83,6 @@ /* Flags track per-device state like workarounds for quirks in older guests. */ #define VIRTIO_PCI_FLAG_BUS_MASTER_BUG (1 << 0) -/* Performance improves when virtqueue kick processing is decoupled from the - * vcpu thread using ioeventfd for some devices. */ -#define VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT 1 -#define VIRTIO_PCI_FLAG_USE_IOEVENTFD (1 << VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT) - /* QEMU doesn't strictly need write barriers since everything runs in * lock-step. We'll leave the calls to wmb() in though to make it obvious for * KVM or if kqemu gets SMP support. |