From: Mika Westerberg <mika.westerberg@linux.intel.com>
To: "Timur Kristóf" <timur.kristof@gmail.com>
Cc: "michael.jamet@intel.com" <michael.jamet@intel.com>,
"dri-devel@lists.freedesktop.org"
<dri-devel@lists.freedesktop.org>
Subject: Re: Why is Thunderbolt 3 limited to 2.5 GT/s on Linux?
Date: Fri, 28 Jun 2019 17:14:55 +0300 [thread overview]
Message-ID: <20190628141455.GO2640@lahna.fi.intel.com> (raw)
In-Reply-To: <c5545128e27cbcce5888f9972ff066fb4979fd28.camel@gmail.com>
On Fri, Jun 28, 2019 at 03:33:56PM +0200, Timur Kristóf wrote:
> I have two more questions:
>
> 1. What is the best way to test that the virtual link is indeed capable
> of 40 Gbit / sec? So far I've been unable to figure out how to measure
> its maximum throughput.
I don't think there is any good way to test it but the Thunderbolt gen 3
link is pretty much always 40 Gb/s (20 Gb/s x 2) from which the
bandwidth is shared dynamically between different tunnels (virtual links).
> 2. Why is it that the game can only utilize as much as 2.5 Gbit / sec
> when it gets bottlenecked? The same problem is not present on a desktop
> computer with a "normal" PCIe port.
This is outside of my knowledge, sorry. How that game even knows it can
"utilize" only 2.5 Gbit/s. Does it go over the output of "lspci" as well? :-)
The PCIe links itself should to get you the 8 GT/s x 4 and I'm quite
sure the underlying TBT link works fine as well so my guess is that the
issue lies somewhere else but where, I have no idea.
Maybe the problem is in the game itself?
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next prev parent reply other threads:[~2019-06-28 14:14 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-28 10:23 Why is Thunderbolt 3 limited to 2.5 GT/s on Linux? Timur Kristóf
2019-06-28 10:32 ` Mika Westerberg
2019-06-28 11:08 ` Timur Kristóf
2019-06-28 11:34 ` Mika Westerberg
2019-06-28 12:21 ` Timur Kristóf
2019-06-28 12:53 ` Mika Westerberg
2019-06-28 13:33 ` Timur Kristóf
2019-06-28 14:14 ` Mika Westerberg [this message]
2019-06-28 14:53 ` Timur Kristóf
2019-07-01 11:44 ` Mika Westerberg
2019-07-01 14:25 ` Timur Kristóf
2019-07-01 14:28 ` Alex Deucher
2019-07-01 14:38 ` Timur Kristóf
2019-07-01 14:46 ` Alex Deucher
2019-07-01 15:10 ` Mika Westerberg
2019-07-01 14:54 ` Michel Dänzer
2019-07-01 16:01 ` Timur Kristóf
2019-07-02 8:09 ` Michel Dänzer
2019-07-02 9:49 ` Timur Kristóf
2019-07-03 8:07 ` Michel Dänzer
2019-07-03 11:04 ` Timur Kristóf
2019-07-04 8:26 ` Michel Dänzer
2019-07-05 9:17 ` Timur Kristóf
2019-07-05 13:36 ` Alex Deucher
2019-07-18 9:11 ` Timur Kristóf
2019-07-18 13:50 ` Alex Deucher
[not found] ` <172a41d97d383a8989ebd213bb4230a2df4d636d.camel@gmail.com>
2019-07-19 14:29 ` Alex Deucher
2019-07-03 18:44 ` Marek Olšák
2019-07-05 9:27 ` Timur Kristóf
2019-07-05 15:35 ` Marek Olšák
2019-07-05 16:01 ` Timur Kristóf
[not found] ` <8f0c2d7780430d40dd1e17a82484d236eae3f981.camel@gmail.com>
2019-07-18 10:29 ` Michel Dänzer
2019-07-22 9:39 ` Timur Kristóf
2019-07-23 8:11 ` Michel Dänzer
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