On 08/30/2015 05:12 PM, Michael S. Tsirkin wrote:
> Even when we skip data decoding, MMIO is slightly slower
> than port IO because it uses the page-tables, so the CPU
> must do a pagewalk on each access.
>
> This overhead is normally masked by using the TLB cache:
> but not so for KVM MMIO, wher
On 09/01/2015 12:31 PM, Michael S. Tsirkin wrote:
> On Tue, Sep 01, 2015 at 11:33:43AM +0800, Jason Wang wrote:
>>
>> On 08/31/2015 07:33 PM, Michael S. Tsirkin wrote:
>>> On Mon, Aug 31, 2015 at 04:03:59PM +0800, Jason Wang wrote:
>>>>>
>>>>
On 09/01/2015 12:36 PM, Michael S. Tsirkin wrote:
> On Tue, Sep 01, 2015 at 11:37:13AM +0800, Jason Wang wrote:
>> >
>> >
>> > On 08/30/2015 05:12 PM, Michael S. Tsirkin wrote:
>>> > > Even when we skip data decoding, MMIO is slightly slower
>>
On 09/01/2015 02:54 PM, Michael S. Tsirkin wrote:
> On Tue, Sep 01, 2015 at 12:47:36PM +0800, Jason Wang wrote:
>>
>> On 09/01/2015 12:31 PM, Michael S. Tsirkin wrote:
>>> On Tue, Sep 01, 2015 at 11:33:43AM +0800, Jason Wang wrote:
>>>> On 08/31/2015 07:33 PM
Cc: Gleb Natapov
Cc: Paolo Bonzini
Signed-off-by: Jason Wang
---
arch/x86/kvm/trace.h | 18 ++
arch/x86/kvm/vmx.c | 1 +
arch/x86/kvm/x86.c | 1 +
3 files changed, 20 insertions(+)
diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
index 4eae7c3..ce4abe3 100644
zero length if an iodevice is zero length.
Cc: Gleb Natapov
Cc: Paolo Bonzini
Signed-off-by: Jason Wang
---
virt/kvm/kvm_main.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index d8db2f8f..d4c3b66 100644
--- a/virt/kvm
This patch factors out core eventfd assign/deassign logic and leave
the argument checking and bus index selection to callers.
Cc: Gleb Natapov
Cc: Paolo Bonzini
Signed-off-by: Jason Wang
---
virt/kvm/eventfd.c | 83 --
1 file changed, 49
.
Changes from v1:
- change ioeventfd_bus_from_flags() to return KVM_FAST_MMIO_BUS when
needed to save lots of unnecessary changes.
Jason Wang (4):
kvm: factor out core eventfd assign/deassign logic
kvm: fix double free for fast mmio eventfd
kvm: fix zero length mmio searching
kvm: add
01
10 00 00
RIP [] ioeventfd_release+0x28/0x60 [kvm]
RSP
Cc: Gleb Natapov
Cc: Paolo Bonzini
Cc: Michael S. Tsirkin
Signed-off-by: Jason Wang
---
virt/kvm/eventfd.c | 111 -
1 file changed, 59 insertions(+), 52 deletions(-)
diff --git
On 09/11/2015 03:39 PM, Cornelia Huck wrote:
> On Fri, 11 Sep 2015 11:17:34 +0800
> Jason Wang wrote:
>
>> This patch factors out core eventfd assign/deassign logic and leave
>> the argument checking and bus index selection to callers.
>>
>> Cc: Gleb Natapov
&g
On 09/11/2015 03:46 PM, Cornelia Huck wrote:
> On Fri, 11 Sep 2015 11:17:35 +0800
> Jason Wang wrote:
>
>> We register wildcard mmio eventfd on two buses, one for KVM_MMIO_BUS
>> and another is KVM_FAST_MMIO_BUS but with a single iodev
>> instance. This will lead a
On 09/11/2015 04:31 PM, Cornelia Huck wrote:
> On Fri, 11 Sep 2015 10:26:41 +0200
> Paolo Bonzini wrote:
>
>> On 11/09/2015 05:17, Jason Wang wrote:
>>> + int len = r2->len ? r1->len : 0;
>>> +
>>> if (r1->addr < r2->addr)
>&
On 09/11/2015 04:33 PM, Paolo Bonzini wrote:
>
> On 11/09/2015 10:15, Michael S. Tsirkin wrote:
>> I think we should add a capability for fast mmio.
>> This way, userspace can avoid crashing buggy kernels.
> I agree.
>
> Paolo
Right, then qemu will use datamatch eventfd if kenrel dost not have t
We only want zero length mmio eventfd to be registered on
KVM_FAST_MMIO_BUS. So check this explicitly when arg->len is zero to
make sure this.
Cc: sta...@vger.kernel.org
Cc: Gleb Natapov
Cc: Paolo Bonzini
Signed-off-by: Jason Wang
---
virt/kvm/eventfd.c | 4 ++--
1 file changed, 2 inserti
Changes from V2:
- Tweak styles and comment suggested by Cornelia.
Changes from v1:
- change ioeventfd_bus_from_flags() to return KVM_FAST_MMIO_BUS when
needed to save lots of unnecessary changes.
Jason Wang (6):
kvm: don't try to register to KVM_FAST_MMIO_BUS for non mmio eventfd
kvm: fac
Cc: Gleb Natapov
Cc: Paolo Bonzini
Signed-off-by: Jason Wang
---
arch/x86/kvm/trace.h | 18 ++
arch/x86/kvm/vmx.c | 1 +
arch/x86/kvm/x86.c | 1 +
3 files changed, 20 insertions(+)
diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
index 4eae7c3..ce4abe3 100644
using zero length if an
iodevice is zero length.
Cc: sta...@vger.kernel.org
Cc: Gleb Natapov
Cc: Paolo Bonzini
Signed-off-by: Jason Wang
---
virt/kvm/kvm_main.c | 19 +--
1 file changed, 17 insertions(+), 2 deletions(-)
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
This patch factors out core eventfd assign/deassign logic and leaves
the argument checking and bus index selection to callers.
Cc: sta...@vger.kernel.org
Cc: Gleb Natapov
Cc: Paolo Bonzini
Signed-off-by: Jason Wang
---
virt/kvm/eventfd.c | 85
00 01
10 00 00
RIP [] ioeventfd_release+0x28/0x60 [kvm]
RSP
Cc: sta...@vger.kernel.org
Cc: Gleb Natapov
Cc: Paolo Bonzini
Signed-off-by: Jason Wang
---
virt/kvm/eventfd.c | 43 +--
1 file changed, 25 insertions(+), 18 deletions(-)
diff --git a/vi
Cc: Gleb Natapov
Cc: Paolo Bonzini
Signed-off-by: Jason Wang
---
Documentation/virtual/kvm/api.txt | 7 ++-
include/uapi/linux/kvm.h | 1 +
virt/kvm/kvm_main.c | 1 +
3 files changed, 8 insertions(+), 1 deletion(-)
diff --git a/Documentation/virtual/kvm/api.txt
b
This path introduces a helper which can give a hint for whether or not
there's a work queued in the work list.
Signed-off-by: Jason Wang
---
drivers/vhost/vhost.c | 6 ++
drivers/vhost/vhost.h | 1 +
2 files changed, 7 insertions(+)
diff --git a/drivers/vhost/vhost.c b/drivers/
olled.
busyloop_timeout = 50 gives us following improvement on TCP_RR test:
size/session/+thu%/+normalize%
1/ 1/ +5%/ -20%
1/50/ +17%/ +3%
Signed-off-by: Jason Wang
---
drivers/vhost/net.c | 19 +++
1 file changed, 19 insertions(+)
diff --git a/drivers/vhost/
On 10/22/2015 04:38 PM, Michael S. Tsirkin wrote:
> On Thu, Oct 22, 2015 at 01:27:28AM -0400, Jason Wang wrote:
>> > This path introduces a helper which can give a hint for whether or not
>> > there's a work queued in the work list.
>> >
>> > Signe
On 10/22/2015 05:33 PM, Michael S. Tsirkin wrote:
> On Thu, Oct 22, 2015 at 01:27:29AM -0400, Jason Wang wrote:
>> This patch tries to poll for new added tx buffer for a while at the
>> end of tx processing. The maximum time spent on polling were limited
>> through a modul
On 10/23/2015 12:16 AM, Michael S. Tsirkin wrote:
> On Thu, Oct 22, 2015 at 08:46:33AM -0700, Rick Jones wrote:
>> On 10/22/2015 02:33 AM, Michael S. Tsirkin wrote:
>>> On Thu, Oct 22, 2015 at 01:27:29AM -0400, Jason Wang wrote:
>>>> This patch tries to poll for n
olled.
Signed-off-by: Jason Wang
---
drivers/vhost/net.c | 54 +
1 file changed, 50 insertions(+), 4 deletions(-)
diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index 9eda69e..30e6d3d 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/
igure per VM through ioctl.
Please review.
Thanks
Jason Wang (2):
vhost: introduce vhost_has_work()
vhost_net: basic polling support
drivers/vhost/net.c | 54 +++
drivers/vhost/vhost.c | 7 +++
drivers/vhost/vhost.h | 1 +
3 files change
This path introduces a helper which can give a hint for whether or not
there's a work queued in the work list.
Signed-off-by: Jason Wang
---
drivers/vhost/vhost.c | 7 +++
drivers/vhost/vhost.h | 1 +
2 files changed, 8 insertions(+)
diff --git a/drivers/vhost/vhost.c b/drivers/
On 10/29/2015 04:45 PM, Jason Wang wrote:
> Hi all:
>
> This series tries to add basic busy polling for vhost net. The idea is
> simple: at the end of tx processing, busy polling for new tx added
> descriptor and rx receive socket for a while. The maximum number of
> time (in
On Sun, Feb 15, 2015 at 3:30 PM, Ding Xiao
wrote:
I am test virtio-vhost in 10G environment
host info
cpu E2680@2.7GHz
memory 16G
network intel 82599BE
os centos 7
VM info
cpu 4
memory 4G
network using virtio vhost
os centos 7
I using pktgen to send udp package, the result like follow
64b
el/git/davem/net")
Cc: David S. Miller
Cc: Al Viro
Cc: Michael S. Tsirkin
Signed-off-by: Jason Wang
---
drivers/vhost/net.c | 11 ++-
1 file changed, 6 insertions(+), 5 deletions(-)
diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index 8dccca9..afa06d2 100644
--- a/drivers/vh
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