it ready caused by the the MSIX mask bit.
so i disable the msix in the newer virtio driver, and i found it have
better performent than msix enabled. the cpu rate of host os reduce.
the reason maybe is ept violation.
I couldn't use newer kernels. because the purpose i used kvm is run
old
On 11/15/2010 09:24 AM, lidong chen wrote:
the address is the Region 1 of virtio_net.
why virtio_net use this address caused ept violation?
It's probably the MSIX mask bit. Older kernels program this bit twice
on every interrupt. Newer kernels do this much less frequently. Try
with a new
2010/11/15, Avi Kivity a...@redhat.com:
On 11/15/2010 09:24 AM, lidong chen wrote:
the address is the Region 1 of virtio_net.
why virtio_net use this address caused ept violation?
It's probably the MSIX mask bit. Older kernels program this bit twice
on every interrupt. Newer kernels do
I think the address maybe initialized in function virtio_pci_probe.
err = pci_request_regions(pci_dev, virtio-pci);
but i did not know when used this address.
2010/11/15, lidong chen chen.lidong.ker...@gmail.com:
2010/11/15, Avi Kivity a...@redhat.com:
On 11/15/2010 09:24 AM, lidong chen
the gpa caused ept violation is below:
most of them is F202.(4060217344)
error gpa is 4060217344
error gpa is 4060217344
error gpa is 4060217344
error gpa is 4060217344
error gpa is 4060217344
error gpa is 4060217344
error gpa is 4060217344
error gpa is 4060217344
error gpa is 4060217344
the address is the Region 1 of virtio_net.
why virtio_net use this address caused ept violation?
00:04.0 Ethernet controller: Unknown device 1af4:1000
Subsystem: Unknown device 1af4:0001
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
On 11/10/2010 09:09 AM, lidong chen wrote:
after slove the ept violation problem, i found the vm exits times is
still more than xen.
and i found most of them is caused by io instruction. then i stat the
port number, most of them is caused by virio_net.
This is also solved by the msi-capable
how to configure virtio to use MSI? I didn't found out it.
thanks.
2010/11/9 Gleb Natapov g...@redhat.com:
On Tue, Nov 09, 2010 at 03:37:44PM +0800, lidong chen wrote:
sorry,i take mistake,
the ept violation is not caused by 2M hugepages, but caused by e1000
emulated by qemu.
I test uesd 2M
On Tue, Nov 09, 2010 at 05:04:15PM +0800, lidong chen wrote:
how to configure virtio to use MSI? I didn't found out it.
thanks.
It looks like it should be enabled by default. What is you guest?
2010/11/9 Gleb Natapov g...@redhat.com:
On Tue, Nov 09, 2010 at 03:37:44PM +0800, lidong chen
the version of guest os is 2.6.16.60-0.21-bigsmp.
the virtio driver we use from RHEL5.5.
2010/11/9 Gleb Natapov g...@redhat.com:
On Tue, Nov 09, 2010 at 05:04:15PM +0800, lidong chen wrote:
how to configure virtio to use MSI? I didn't found out it.
thanks.
It looks like it should be enabled
On Tue, Nov 09, 2010 at 06:24:06PM +0800, lidong chen wrote:
the version of guest os is 2.6.16.60-0.21-bigsmp.
the virtio driver we use from RHEL5.5.
This guest does not support MSI.
2010/11/9 Gleb Natapov g...@redhat.com:
On Tue, Nov 09, 2010 at 05:04:15PM +0800, lidong chen wrote:
after slove the ept violation problem, i found the vm exits times is
still more than xen.
and i found most of them is caused by io instruction. then i stat the
port number, most of them is caused by virio_net.
qemu-kvm-18727 [006] 31297.698935: kvm_pio: pio_read at 0xc093
size 1 count 1
I run my application both on xen and kvm, and I found the performance
on kvm is worse than xen.
kvm: 2.6.32-60.el6.x86_64 redhat 6 bate 2
xen: xen3.4.2
then i stat the vm exit reason, and i found the ept violation reason,
kvm is much more than xen. the static result is :
(XEN) 10 times on
On 11/08/2010 02:15 PM, lidong chen wrote:
I run my application both on xen and kvm, and I found the performance
on kvm is worse than xen.
kvm: 2.6.32-60.el6.x86_64 redhat 6 bate 2
xen: xen3.4.2
then i stat the vm exit reason, and i found the ept violation reason,
kvm is much more than xen.
sorry,i take mistake,
the ept violation is not caused by 2M hugepages, but caused by e1000
emulated by qemu.
I test uesd 2M hugepages and virio, the performance is better than
e1000. but is still worse than xen. I will continue to find out other
reason.
so, there are two question:
1.why have
On Tue, Nov 09, 2010 at 03:37:44PM +0800, lidong chen wrote:
sorry,i take mistake,
the ept violation is not caused by 2M hugepages, but caused by e1000
emulated by qemu.
I test uesd 2M hugepages and virio, the performance is better than
e1000. but is still worse than xen. I will continue to
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