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From 3d48415578c65490675616d41a32a1e9e3a71f43 Mon Sep 17 00:00:00 2001
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From: "Daniel P. Berrange" <berrange@redhat.com>
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Date: Thu, 8 Feb 2018 17:50:34 +0100
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Subject: [PATCH 20/27] ui: correctly reset framebuffer update state after
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processing dirty regions
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Daniel P. Berrange <berrange@redhat.com>
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Message-id: <20180208175041.5634-21-berrange@redhat.com>
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Patchwork-id: 78941
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O-Subject: [RHEL-7.5 qemu-kvm PATCH v1 20/27] ui: correctly reset framebuffer update state after processing dirty regions
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Bugzilla: 1527405
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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RH-Acked-by: Gerd Hoffmann <kraxel@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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From: "Daniel P. Berrange" <berrange@redhat.com>
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According to the RFB protocol, a client sends one or more framebuffer update
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requests to the server. The server can reply with a single framebuffer update
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response, that covers all previously received requests. Once the client has
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read this update from the server, it may send further framebuffer update
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requests to monitor future changes. The client is free to delay sending the
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framebuffer update request if it needs to throttle the amount of data it is
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reading from the server.
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The QEMU VNC server, however, has never correctly handled the framebuffer
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update requests. Once QEMU has received an update request, it will continue to
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send client updates forever, even if the client hasn't asked for further
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updates. This prevents the client from throttling back data it gets from the
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server. This change fixes the flawed logic such that after a set of updates are
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sent out, QEMU waits for a further update request before sending more data.
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Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
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Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
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Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
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Message-id: 20171218191228.31018-8-berrange@redhat.com
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Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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(cherry picked from commit 728a7ac95484a7ba5e624ccbac4c1326571576b0)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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ui/vnc.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/ui/vnc.c b/ui/vnc.c
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index 7239602..075def1 100644
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--- a/ui/vnc.c
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+++ b/ui/vnc.c
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@@ -910,7 +910,7 @@ static int vnc_update_client(VncState *vs, int has_dirty)
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}
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vnc_job_push(job);
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- vs->update = VNC_STATE_UPDATE_INCREMENTAL;
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+ vs->update = VNC_STATE_UPDATE_NONE;
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vs->has_dirty = 0;
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return n;
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}
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--
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1.8.3.1
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