From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:49674) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1asRxS-0002QQ-Hb for qemu-devel@nongnu.org; Tue, 19 Apr 2016 05:28:38 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1asRxP-0002Bo-Bc for qemu-devel@nongnu.org; Tue, 19 Apr 2016 05:28:34 -0400 Received: from mx1.redhat.com ([209.132.183.28]:40015) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1asRxP-0002BA-6T for qemu-devel@nongnu.org; Tue, 19 Apr 2016 05:28:31 -0400 From: Juan Quintela In-Reply-To: <1460643912-244245-1-git-send-email-agraf@suse.de> (Alexander Graf's message of "Thu, 14 Apr 2016 16:25:12 +0200") References: <1460643912-244245-1-git-send-email-agraf@suse.de> Reply-To: quintela@redhat.com Date: Tue, 19 Apr 2016 11:28:25 +0200 Message-ID: <874maykkw6.fsf@emacs.mitica> MIME-Version: 1.0 Content-Type: text/plain Subject: Re: [Qemu-devel] [PATCH] hid: Extend the event queue size to 1024 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Alexander Graf Cc: qemu-devel@nongnu.org, Gerd Hoffmann , Dinar Valeev , Dirk Mueller Alexander Graf wrote: > We can currently buffer up to 16 events in our event queue for input > devices. While it sounds like 16 events backlog for everyone should > be enough, our automated testing tools (OpenQA) manage to easily > type faster than our guests can handle. > > So we run into queue overflows and start to drop input characters. > By typing quickly, I was even able to reproduce this manually in > a vnc session on SLOF. > > Fix this by increasing the queue buffer. With 1k events I'm sure we > can get by for the foreseeable future. To maintain backwards compatibility > on live migration, put the extra queue items into separate subsections. > > Reported-by: Dinar Valeev > Signed-off-by: Alexander Graf Hi I see that it appears you have agreed in a different solution. Just to say that this patch is ok from the migration point of view O:-) Later, Juan. PD. No, REAL HARDWARE don't have migration either O:-)