On Thu, Sep 27, 2012 at 12:01 PM, Paolo Bonzini pbonz...@redhat.com wrote:
Il 27/09/2012 02:10, Rusty Russell ha scritto:
+do {
+virtqueue_disable_cb(vq);
+while ((vbr = virtqueue_get_buf(vblk-vq, len)) !=
NULL) {
+if
Asias He as...@redhat.com writes:
I forgot about the cool hack which MST put in to defer event updates
using disable_cb/enable_cb.
Hmm, are you talking about virtqueue_enable_cb_delayed()?
Just the fact that virtqueue_disable_cb() prevents updates of
used_index, and then we do the update in
On 09/28/2012 02:08 PM, Rusty Russell wrote:
Asias He as...@redhat.com writes:
I forgot about the cool hack which MST put in to defer event updates
using disable_cb/enable_cb.
Hmm, are you talking about virtqueue_enable_cb_delayed()?
Just the fact that virtqueue_disable_cb() prevents
On Thu, Sep 27, 2012 at 09:40:03AM +0930, Rusty Russell wrote:
I forgot about the cool hack which MST put in to defer event updates
using disable_cb/enable_cb.
I considered sticking some invalid value
in event index on disable but in my testing it did not seem to
give any gain, and knowing
Il 27/09/2012 02:10, Rusty Russell ha scritto:
+do {
+virtqueue_disable_cb(vq);
+while ((vbr = virtqueue_get_buf(vblk-vq, len)) !=
NULL) {
+if (vbr-bio) {
+virtblk_bio_done(vbr);
+
Asias He as...@redhat.com writes:
On 09/25/2012 10:36 AM, Asias He wrote:
This reduces unnecessary interrupts that host could send to guest while
guest is in the progress of irq handling.
If one vcpu is handling the irq, while another interrupt comes, in
handle_edge_irq(), the guest will
On 09/25/2012 10:36 AM, Asias He wrote:
This reduces unnecessary interrupts that host could send to guest while
guest is in the progress of irq handling.
If one vcpu is handling the irq, while another interrupt comes, in
handle_edge_irq(), the guest will mask the interrupt via mask_msi_irq()
This reduces unnecessary interrupts that host could send to guest while
guest is in the progress of irq handling.
If one vcpu is handling the irq, while another interrupt comes, in
handle_edge_irq(), the guest will mask the interrupt via mask_msi_irq()
which is a very heavy operation that goes
