vnc: Set default kbd delay to 10ms

The current VNC default keyboard delay is 1ms. With that we're constantly
typing faster than the guest receives keyboard events from an XHCI attached
USB HID device.

The default keyboard delay time in the input layer however is 10ms. I don't know
how that number came to be, but empirical tests on some OpenQA driven ARM
systems show that 10ms really is a reasonable default number for the delay.

This patch moves the VNC delay also to 10ms. That way our default is much
safer (good!) and also consistent with the input layer default (also good!).

Signed-off-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Daniel P. Berrange <berrange@redhat.com>
Message-id: 1499863425-103133-1-git-send-email-agraf@suse.de
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

diff --git a/qemu-options.hx b/qemu-options.hx
index 76b1c677373da5e8d2f1f2f87715e6a4bb66e282..6909285e85075add7bd018962802d71caf73f882 100644 (file)
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -1753,7 +1753,7 @@ spec but is traditional QEMU behavior.
 @item key-delay-ms
 
 Set keyboard delay, for key down and key up events, in milliseconds.
-Default is 1.  Keyboards are low-bandwidth devices, so this slowdown
+Default is 10.  Keyboards are low-bandwidth devices, so this slowdown
 can help the device and guest to keep up and not lose events in case
 events are arriving in bulk.  Possible causes for the latter are flaky
 network connections, or scripts for automated testing.

diff --git a/ui/vnc.c b/ui/vnc.c
index 26136f5d29e37adf2177f901cc7616a16c28accc..eb91559b6b35ab6de5c856ec4784f2f4466a166e 100644 (file)
--- a/ui/vnc.c
+++ b/ui/vnc.c
@@ -3808,7 +3808,7 @@ void vnc_display_open(const char *id, Error **errp)
     }
 
     lock_key_sync = qemu_opt_get_bool(opts, "lock-key-sync", true);
-    key_delay_ms = qemu_opt_get_number(opts, "key-delay-ms", 1);
+    key_delay_ms = qemu_opt_get_number(opts, "key-delay-ms", 10);
     sasl = qemu_opt_get_bool(opts, "sasl", false);
 #ifndef CONFIG_VNC_SASL
     if (sasl) {