Hi,
On 3/10/17 11:01 AM, Christophe Fergeau wrote:
On Fri, Mar 10, 2017 at 10:49:54AM -0600, Jeremy White wrote:
Hey all,
We've got an issue with a remote viewer kiosk. That is, in our normal
mode of operation, if something goes wrong with a client connection
(e.g. the sessions is killed, server restarted normally), the kiosk will
exit on disconnect, and we get a chance to retry the connection, or
present the user with a 'server down' style message.
But in the case of a serious network problem or a server hard power
cycle (i.e. no TCP FIN packets can flow), our end user behavior is not
ideal - the kiosk appears to hang solid, requiring a power cycle.
That's because we've got the stock keepalive timeouts, or about 2 hours
and 11 minutes, before the client sees the disconnect.
Now this is a relatively rare occurrence, and arguably a minor nuisance,
but I've been asked to see what it would take to improve the situation.
I looked for past discussions on spice-devel; I only readily found
discussion of the keepalive parameters on the server side, and it looks
like we take the idle timer down to 10 minutes now, from 2 hours. I
didn't find discussion of something similar client side.
Have we considered tuning them on the spice-gtk client side?
The attached patch applies a roughly 75 second timeout for me; is this
something that would be viable to add to the gtk client, even if only as
an option?
Ah, I've coincidentally been looking at this this week too, not with the
same goal in mind though, my problem is SPICE connection sometimes
getting dropped if idle for too long. But the current answer is also
tweaking TCP keepalives.
Definitely no objection having some form of keepalive client sides,
though your proposed change is not going to work for the Windows client.
I've made some good progress on patches to add both Windows/linux
support to glib, but need to finish them up ;)
Ping? This problem persists, and the patch I sent then:
https://lists.freedesktop.org/archives/spice-devel/attachments/20170310/6938c6dc/attachment.diff
has been working for us for a number of years without any unexpected
consequences.
Could I submit this patch and we remove it when there is a better
solution that also supports Windows?
Cheers,
Jeremy
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