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Re: [Qemu-devel] QEMU websockets support is laggy?

From: Daniel P. Berrange
Subject: Re: [Qemu-devel] QEMU websockets support is laggy?
Date: Fri, 27 Jan 2017 09:35:38 +0000
User-agent: Mutt/1.7.1 (2016-10-04)

On Tue, Jan 24, 2017 at 05:02:25PM -0500, Brian Rak wrote:
> We've been considering switching over to using qemu's built in websockets
> support (to avoid the overhead of needing websockify running).  We've been
> seeing very poor performance after the switch (it takes the console 4-5
> seconds to update after pressing a key).  So far, I haven't been able to
> find any indication of why this is happening.  The exact same configuration
> works perfectly when running with websockify, but laggy when hitting qemu
> directly.
> I've tried a few things (disabling encryption, bypassing our usual nginx
> proxy, even connecting via a ssh tunnel), and haven't made any sort of
> progress here.  Has anyone else seen this?  Any suggestions as to where I
> should start looking?

Can you clarify the exact setup you have ?  As mentioned on IRC, I don't
see any degradation in performance betweeen builtin websockets vs a
websockets proxy - if anything the builtin websockets is marginally less
laggy.  I was connecting over TCP localhost, however, so would not see
any effects of network latency. My test was QEMU git master, with noVNC
git master.

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