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bh=vjaUvl7is/97N0mSNFM1YCy5T+bjEvlbfnbSbRgu1oQ=; b=dRck5R3/1x0taE3qruP7w4qgXAU8V3Lzh8sf60XHRaLRmAydmuG9SSzQiYqPm3a4pbsiyN OqqT/yE1vDjk8Gq7T5oDPIlQ8oFs8stix+g57zHPLadoWuUL+zv9VwTyEAmCYl3YhONxZ8 MU9T9fv+e7+eB2/CrNxEkXdCFQW3isQ= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-387-zLkW_i5TOVCDQg4yBnvYTg-1; Tue, 02 Feb 2021 06:17:17 -0500 X-MC-Unique: zLkW_i5TOVCDQg4yBnvYTg-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 8D8301DDE9 for ; Tue, 2 Feb 2021 11:17:16 +0000 (UTC) Received: from redhat.com (ovpn-112-202.ams2.redhat.com [10.36.112.202]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 51D395FC19; Tue, 2 Feb 2021 11:17:12 +0000 (UTC) Date: Tue, 2 Feb 2021 11:17:09 +0000 From: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= To: Gerd Hoffmann Subject: Re: vnc clipboard support Message-ID: <20210202111709.GB4168502@redhat.com> References: <20210129110814.GF4001740@redhat.com> <0F802343-19F8-487C-8BBE-5BBE2014BA1C@redhat.com> <20210129143252.GE4008275@redhat.com> <05C58667-D9BA-49E2-897D-2286B243E802@redhat.com> <20210201155116.GL4131462@redhat.com> <0C14700F-CF47-4CD1-AB41-AA69BC0DA469@redhat.com> <20210201165634.GM4131462@redhat.com> <20210201174018.GP4131462@redhat.com> <20210202111015.peh4cslwvxuot6qv@sirius.home.kraxel.org> MIME-Version: 1.0 In-Reply-To: <20210202111015.peh4cslwvxuot6qv@sirius.home.kraxel.org> User-Agent: Mutt/1.14.6 (2020-07-11) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=berrange@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Received-SPF: pass client-ip=216.205.24.124; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.351, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= Cc: Christophe de Dinechin , qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Tue, Feb 02, 2021 at 12:10:15PM +0100, Gerd Hoffmann wrote: > Hi, > > > > How do you rate-limit intelligently to avoid overflowing the guest keyboard buffers? > > > > Like I said earlier in this thread, this is a big problem with > > keyboard injection. > > It's a solved problem though, the qemu vnc server has throttling > implemented already. There even is an option to configure the delay > (key-delay-ms). Depends on your view of "solved" really. If I've highlighted a region of text in openoffice that is 100 KB in size, and press "Ctrl-V" in the VNC window for the VM, with a 10 ms delay, i'll be waiting 15 minutes for it to finish injecting keystrokes. Anything longer than 1 second is unacceptable. If you make the delay too short the guest keyboard handler will loose keys. So realistically I think keyboard injection is limted to about 100 characters of text. Regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|