sepherosa_gmail.com created this revision.
sepherosa_gmail.com added reviewers: network, adrian, delphij, royger, 
decui_microsoft.com, honzhan_microsoft.com, howard0su_gmail.com.
sepherosa_gmail.com added subscribers: freebsd-net-list, 
freebsd-virtualization-list.

REVISION SUMMARY
  This one gives the best performance so far.

REVISION DETAIL
  https://reviews.freebsd.org/D5273

AFFECTED FILES
  sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c

CHANGE DETAILS
  diff --git a/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c 
b/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c
  --- a/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c
  +++ b/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c
  @@ -465,6 +465,13 @@
            hn_tx_chimney_size < sc->hn_tx_chimney_max)
                sc->hn_tx_chimney_size = hn_tx_chimney_size;
   
  +     /*
  +      * Always schedule transmission instead of trying
  +      * to do direct transmission.  This one gives the
  +      * best performance so far.
  +      */
  +     sc->hn_sched_tx = 1;
  +
        ctx = device_get_sysctl_ctx(dev);
        child = SYSCTL_CHILDREN(device_get_sysctl_tree(dev));

EMAIL PREFERENCES
  https://reviews.freebsd.org/settings/panel/emailpreferences/

To: sepherosa_gmail.com, network, adrian, delphij, royger, decui_microsoft.com, 
honzhan_microsoft.com, howard0su_gmail.com
Cc: freebsd-virtualization-list, freebsd-net-list
diff --git a/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c b/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c
--- a/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c
+++ b/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c
@@ -465,6 +465,13 @@
 	    hn_tx_chimney_size < sc->hn_tx_chimney_max)
 		sc->hn_tx_chimney_size = hn_tx_chimney_size;
 
+	/*
+	 * Always schedule transmission instead of trying
+	 * to do direct transmission.  This one gives the
+	 * best performance so far.
+	 */
+	sc->hn_sched_tx = 1;
+
 	ctx = device_get_sysctl_ctx(dev);
 	child = SYSCTL_CHILDREN(device_get_sysctl_tree(dev));
 

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