ing if the device
is the last,
whose code is dev->vq_index + dev->nvqs != dev->vq_index_end in
vhost_vdpa_dev_start().
I think these are the causes of the problem.
Thank you!
On Mon, Apr 24, 2023 at 3:04 PM Eugenio Perez Martin
wrote:
>
> On Sat, Apr 22, 2023 at 8:39 AM Shao-Chien
Hi,
I found a problem about cache.
If there are several devices operating the same backend device, the
cache might be inconsistent.
I think we could handle this by checking if a device is the first
device, but I'm not sure it will be feasible.
Is there any better approach to this problem?
Than
Repetitive ioctls makes vdpa devices initialization and startup slow.
This patch series is to cache Virtio status, features, and config.
For each latency test, I use vdpa-sim-net as my vdpa device.
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1579
Shao-Chien Chiang (2):
vhost-vdpa
-by: Shao-Chien Chiang
---
hw/virtio/vhost-vdpa.c | 44 +++---
include/hw/virtio/vhost-vdpa.h | 2 ++
2 files changed, 38 insertions(+), 8 deletions(-)
diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c
index ccde4c7040..92bb09ef4d 100644
--- a/hw
After caching the device status and features, the latency is reduced by 0.059
sec.
Signed-off-by: Shao-Chien Chiang
---
hw/virtio/vhost-vdpa.c | 16 ++--
include/hw/virtio/vhost-vdpa.h | 2 ++
2 files changed, 12 insertions(+), 6 deletions(-)
diff --git a/hw/virtio/vhost
-by: Shao-Chien Chiang
---
hw/virtio/vhost-vdpa.c | 44 +++---
include/hw/virtio/vhost-vdpa.h | 3 +++
2 files changed, 33 insertions(+), 14 deletions(-)
diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c
index bc6bad23d5..1fccd151cf 100644
--- a/hw
