Hi,
On 06-02-17 23:01, Jan Pokorný wrote:
On 06/02/17 15:13 -0500, Christian Schaller wrote:
There has been a lot of discussions for the last few years about glvnd on
the mesa-devel list and at XDC. This is not Fedora specific technology, but
a change in how Mesa will work everywhere and thus there has not been a lot
of discussions about it here on Fedora-devel. But that is true for most stuff,
we do not discuss major new kernel features here that much either as one example.
I don't think that's a fair point. If there was an artificial
intermediate level put in front of libc that would only be to
solve issues with some hardware component, and it would be forcibly
implanted into Fedora unnecessarily for all audience, then it would
be comparable.
But even then, I doubt it would happen without questioning such
aspects.
Forcing glvnd for all is Fedora specific, as far as I can tell.
I just got asked a bunch of question by the Debian X / mesa
maintainer about glvnd since he is working on moving Debian over
to this too. Really there is nothing Fedora specific about this.
Regards,
Hans
-- Jan
Christian
----- Original Message -----
From: "Jan Pokorný" <jpokorny@xxxxxxxxxx>
To: devel@xxxxxxxxxxxxxxxxxxxxxxx
Sent: Monday, February 6, 2017 2:32:35 PM
Subject: Re: The glvnd + mesa update for F25
On 06/02/17 05:06 +0100, Kevin Kofler wrote:
Hans de Goede wrote:
libglvnd is a solution for this it is a vendor neutral
implementation of libGL.so.1 which acts as a dispatcher
to one or more glvnd enabled libGL implementations
installed on the systems.
By doing so, it decreases performance for all the users of the Mesa
drivers by adding an unnecessary layer of indirection. I do not see
performance being addressed at all in any of your communication, did
you even try to measure the impact of the added indirection layer?
These are the thoughts that crossed my mind as well, I'll admit.
Do we have any sort of measurements or at least the related theoretical
backgrounds, such as "indirection will impose a small slowdown, but
only at the very initial phase of execution till all the necessary
symbols are resolved, no effect since then"? Is it in fact worse?
The fact there was no serious discussion about the change is rather
unsettling, IMHO.
--
Jan (Poki)
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