Hi Todd,
What we need to do every so often after initial configuration, is
a bw_rlimit speed change via TC reconfig.
In the end we will probably have two (or more) mpprio queues per
interface, each at a different shaped rate which we would like to
change every so often. In our application we will direct traffic
from one queue to the other at different times. Ideally it is
better not to have packet loss during the reconfiguration change,
however, if it is very small and only affects the particular
mqprio queue whose rate we are changing, we can work around it.
Thanks again for your help with this.
Kind regards,
David
On Wed, Apr 27 2022 at 17:10, "Fujinaka, Todd"
<todd.fujin...@intel.com> wrote:
I had a couple more questions from the developer about your
requirements.
What is needed: is speed change, TC reconfig, queue number
change correct?
Would it be acceptable to see packet loss during reconfiguration
with changes to the configuration?
Todd Fujinaka
Software Application Engineer
Ethernet Products Group
Intel Corporation
todd.fujin...@intel.com
-----Original Message-----
From: Fujinaka, Todd <todd.fujin...@intel.com>
Sent: Tuesday, April 26, 2022 8:34 AM
To: David Hayes <dav...@simula.no>
Cc: e1000-de...@lists.sf.net
Subject: Re: [E1000-devel] tc changing mqprio parameters
X710-T4L
OK. I'll let you know when I get some updates from the
developers.
Todd Fujinaka
Software Application Engineer
Ethernet Products Group
Intel Corporation
todd.fujin...@intel.com
-----Original Message-----
From: David Hayes <dav...@simula.no>
Sent: Tuesday, April 26, 2022 6:47 AM
To: Fujinaka, Todd <todd.fujin...@intel.com>
Cc: e1000-de...@lists.sf.net
Subject: Re: [E1000-devel] tc changing mqprio parameters
X710-T4L
Hi Todd,
Thanks for this. I have confirmed that what the engineering team
suggest as a work around does work on our equipment.
However, for our application we do need to leave the filters on.
Thanks so much for your help.
Kind regards,
David
On Tue, Apr 26 2022 at 13:29, "Fujinaka, Todd"
<todd.fujin...@intel.com> wrote:
I got a reply from the engineering team:
A workaround is to reinitialize everything. Instead of:
tc qdisc replace dev enp130s0f0 root mqprio num_tc 1 hw 1 mode
channel
shaper bw_rlimit min_rate 0Mbit max_rate 500Mbit map 0 0 0 0 0
0 0 0
queues 1@0 tc qdisc change dev enp130s0f0 root mqprio num_tc 1
hw 1
mode channel shaper bw_rlimit min_rate 0Mbit max_rate 200Mbit
map 0 0
0 0 0 0 0 0 queues 1@0
Can you do this:
tc qdisc replace dev enp130s0f0 root mqprio num_tc 1 hw 1 mode
channel
shaper bw_rlimit min_rate 0Mbit max_rate 500Mbit map 0 0 0 0 0
0 0 0
queues 1@0 tc qdisc del dev enp130s0f0 root tc qdisc replace
dev
enp130s0f0 root mqprio num_tc 1 hw 1 mode channel shaper
bw_rlimit
min_rate 0Mbit max_rate 200Mbit map 0 0 0 0 0 0 0 0 queues 1@0
They did mention this would inactivate the filters, so if you
need
leave them on we'll need to do some more work on our end.
Todd Fujinaka
Software Application Engineer
Ethernet Products Group
Intel Corporation
todd.fujin...@intel.com
-----Original Message-----
From: David Hayes <dav...@simula.no>
Sent: Thursday, April 21, 2022 2:47 AM
To: Fujinaka, Todd <todd.fujin...@intel.com>
Cc: e1000-de...@lists.sf.net
Subject: Re: [E1000-devel] tc changing mqprio parameters
X710-T4L
Hi Todd,
Thank you for getting back to me. It is probably easier if you
file
the bug.
A little more information in case it is useful:
We have also tried this running the 5.17.1 kernel with the same
result.
When the OS starts, the interfaces are initially given default
fq_codel qdiscs. We are able to replace these with the mqprio
qdisc,
but after doing that we can make no further changes.
The cards have the latest (8.60 version) firmware installed.
Thanks and regards,
David
On Wed, Apr 20 2022 at 19:01, "Fujinaka, Todd"
<todd.fujin...@intel.com> wrote:
Do you have some way to file a bug with us through your
factory
contact? Otherwise I will file a bug and then relay the info
via
email.
Todd Fujinaka
Software Application Engineer
Ethernet Products Group
Intel Corporation
todd.fujin...@intel.com
-----Original Message-----
From: David Hayes <dav...@simula.no>
Sent: Wednesday, April 13, 2022 5:27 AM
To: e1000-de...@lists.sf.net
Subject: [E1000-devel] tc changing mqprio parameters X710-T4L
Hi list,
We are using a couple of X710-T4L cards in an experimental
testbed.
The computer with the cards is currently manjaro linux
5.17rc7 kernel, and cards have been updated with the latest
nvm 8.60.
As part of the work we wish to periodically change the
shapers'
max_rate parameter.
We set up the qdisc as follows:
# tc qdisc replace dev <interface> root mqprio num_tc 1 hw 1
mode
channel shaper bw_rlimit min_rate 0Mbit max_rate 500Mbit map
0
0
0 0 0 0 0 0 queues 1@0
This works well and we are able to confirm the 500Mbit limit
experimentally.
However, when we try to change the speed:
# tc qdisc change dev <interface> root mqprio num_tc 1 hw 1
mode
channel shaper bw_rlimit min_rate 0Mbit max_rate 200Mbit map
0
0
0 0 0 0 0 0 queues 1@0
we get the following error message:
Change operation is not supported by specified qdisc
We are also unable use "replace" a second time.
I know our use case is a little unusual, but it is
simple. Does
anyone have any ideas what the problem could be and how we can
fix it
or work around it?
Many thanks,
David
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To learn more about Intel Ethernet, visit
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_______________________________________________
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https://lists.sourceforge.net/lists/listinfo/e1000-devel
To learn more about Intel Ethernet, visit
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_______________________________________________
E1000-devel mailing list
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https://lists.sourceforge.net/lists/listinfo/e1000-devel
To learn more about Intel Ethernet, visit
https://forums.intel.com/s/topic/0TO0P00000018NbWAI/intel-ethernet
