[Dynamic buffer calc] Support dynamic buffer calculation #6194

stephenxs · 2020-12-11T23:00:19Z

- Why I did it
To support dynamic buffer calculation.
This PR also depends on the following PRs for sub modules

- How I did it

Introduce field buffer_model in DEVICE_METADATA|localhost to represent which buffer model is running in the system currently:
- dynamic for the dynamic buffer calculation model
- traditional for the traditional model in which the pg_profile_lookup.ini is used
Add the tables required for the feature:
- ASIC_TABLE in platform/<vendor>/asic_table.j2
- PERIPHERAL_TABLE in platform/<vendor>/peripheral_table.j2
- PORT_PERIPHERAL_TABLE on a per-platform basis in device/<vendor>/<platform>/port_peripheral_config.j2 for each platform with gearbox installed.
- DEFAULT_LOSSLESS_BUFFER_PARAMETER and LOSSLESS_TRAFFIC_PATTERN in files/build_templates/buffers_config.j2
- Add lossless PGs (3-4) for each port in files/build_templates/buffers_config.j2
Copy the newly introduced j2 files into the image and rendering them when the system starts
Update the CLI options for buffermgrd so that it can start with dynamic mode
Fetches the ASIC vendor name in orchagent:
- fetch the vendor name when creates the docker and pass it as a docker environment variable
- buffermgrd can use this passed-in variable
Clear buffer related tables from STATE_DB when swss docker starts
Update the src/sonic-config-engine/tests/sample_output/buffers-dell6100.json according to the buffer_config.j2
Remove buffer pool sizes for ingress pools and egress_lossy_pool
Update the buffer settings for dynamic buffer calculation

Signed-off-by: Stephen Sun stephens@nvidia.com

- How to verify it

- Description for the changelog

- A picture of a cute animal (not mandatory but encouraged)

1. add tables required for the feature: - ASIC_TABLE in platform/mellanox/asic_table.j2 (Mellanox specific) - PERIPHERAL_TABLE in platform/mellanox/peripheral_table.j2 (Mellanox specific) - PORT_PERIPHERAL_TABLE on a per-platform basis in device/mellanox/x86_64-mlnx_msn3800-r0/port_peripheral_config.j2 (Mellanox specific) - DEFAULT_LOSSLESS_BUFFER_PARAMETER and LOSSLESS_TRAFFIC_PATTERN in files/build_templates/buffers_config.j2 - Add lossless PGs (3-4) for each port in files/build_templates/buffers_config.j2 2. copy the newly introduced j2 files into image and rendering them when system starts 3. update the CLI options for buffermgrd so that it can start with dynamic mode 4. Adjust the order in which swss daemons start, making buffermgrd start before orchagent. This is to make sure buffermgrd can get everything ready before orchagent starts especially during warm reboot. 5. Optimize the way in which orchagent fetches the asic vendor name: - fetch the vendor name when creates the docker and pass it as a docker environment variable - orchagent and buffermgrd can use this passed-in variable 6. Clear buffer related tables from STATE_DB when swss docker starts 7. Update the src/sonic-config-engine/tests/sample_output/buffers-dell6100.json according to the buffer_config.j2 8. Remove buffer pool sizes for ingress pools and egress_lossy_pool Update the buffer settings for dynamic buffer calculation Signed-off-by: Stephen Sun <stephens@nvidia.com>

1. If all the buffer configuration aligns the default, use dynamic buffer calculation mode. Otherwise, use the traditional mode 2. Dynamic mode is adopted in switches newly installed from scratch and traditional mode in switches installed from ninigraph This is done by: - introducing a wrapper to buffermgrd, which enables it to test which mode is adopted and feed buffermgrd with corresponding CLI arguments - preparing default buffer configuration templates for both dynamic and traditional mode for each SKU - introduce "buffer_model" in DEVICE_METADATA|localhost for mellanox platform Signed-off-by: Stephen Sun <stephens@nvidia.com>

Signed-off-by: Stephen Sun <stephens@nvidia.com>

- For Mellanox, dynamic by default - For other vendors, traditional mode. Signed-off-by: Stephen Sun <stephens@nvidia.com>

Signed-off-by: Stephen Sun <stephens@nvidia.com>

…able Signed-off-by: Stephen Sun <stephens@nvidia.com>

Signed-off-by: Stephen Sun <stephens@nvidia.com>

files/build_templates/buffers_config.j2

qiluo-msft · 2020-12-12T02:36:53Z

files/build_templates/docker_image_ctl.j2

+ fi
+ if [ ! -f /etc/sonic/peripheral_table.json ] && [ -f /usr/share/sonic/device/$PLATFORM/port_peripheral_config.j2 ]; then
+ sonic-cfggen -d -t /usr/share/sonic/device/$PLATFORM/port_peripheral_config.j2 > /etc/sonic/peripheral_table.json
+ fi


Move this block into inside swss container? #Closed

Given that the asic table and peripheral table won't be changed on-the-fly, I'd like to have them called once only when the docker is created instead of called each time the swss docker starts.
Let me know if there are other concerns.

Seems here is called when the docker swss is started, not created.
You already check the files existing, so not too much time wasted after file created.

In reply to: 541481038 [](ancestors = 541481038)

ok.
Let's move to buffermgrd.sh. Put the code generating asic_table.json and peripheral_table.json just ahead of the place where it is used.

Just investigated and realized it’s will be very difficult to move this part into swss docker because it requires asic_table.j2 and peripheral_table.j2 to be copied in docker swss. However, it’s defined on a per vendor basis and in platform/<vendor> dir, which makes it difficult to copy into docker in the Dockerfile.j2.
So we have to have this part in docker_image_control.
Meanwhile, I also noticed that the PLATFORM isn't defined in this function. This can be achieved by moving this part into start() function.

Regarding "it’s defined on a per vendor basis and in platform/ dir, which makes it difficult to copy into docker in the Dockerfile.j2"
I checked docker inspect swss and found /usr/share/sonic/device/$PLATFORM/ is already mapped into swss container.

{ "Type": "bind", "Source": "/usr/share/sonic/device/x86_64-mlnx_msn2700-r0", "Destination": "/usr/share/sonic/platform", "Mode": "ro", "RW": false, "Propagation": "rprivate" },

Mounting is happened after running a container, so I did not propose modify Dockerfile.j2, instead, modify dockers/docker-orchagent/docker-init.sh.

I think you can treat asic_table.j2 the same way as port_peripheral_config.j2. Why they are copied into different folders?

In reply to: 541513109 [](ancestors = 541513109,541481038)

The port peripheral config is defined on a per platform basis because each platform has its unique configuration. But the asic_table.j2 is shared among all platforms of the same vendor. It should not be copied to each of the platform folders.

qiluo-msft · 2020-12-12T02:37:55Z

files/build_templates/docker_image_ctl.j2

@@ -243,6 +250,11 @@ start() {
 echo "Creating new ${DOCKERNAME} container with HWSKU $HWSKU"
 {%- endif %}

+ {%- if docker_container_name == "swss" %}
+ # Obtain the vendor name
+ ASIC_VENDOR=`$SONIC_CFGGEN -y /etc/sonic/sonic_version.yml -v asic_type`


Move this into inside swss container? #Closed

The same as the previous one. I'd like call this once during docker creation instead of many times.

qiluo-msft · 2020-12-12T02:38:43Z

files/build_templates/init_cfg.json.j2

@@ -1,6 +1,7 @@
 {
 "DEVICE_METADATA": {
 "localhost": {
+ "buffer_model": {% if default_buffer_model == "dynamic" %}"dynamic"{% else %}"traditional"{% endif %},


traditional [](start = 90, length = 11)

dynamic vs static? #Closed

dynamic / traditional is the term we already agreed on, isn't it?

platform/vs/asic_table.j2

qiluo-msft · 2020-12-12T02:49:34Z

files/build_templates/sonic_debian_extension.j2

@@ -392,6 +392,19 @@ sudo cp $BUILD_TEMPLATES/buffers_config.j2 $FILESYSTEM_ROOT_USR_SHARE_SONIC_TEMP
 # Copy the qos configuration template
 sudo cp $BUILD_TEMPLATES/qos_config.j2 $FILESYSTEM_ROOT_USR_SHARE_SONIC_TEMPLATES/

+# Copy the templates for dynamically buffer calculation
+{% if sonic_asic_platform == "mellanox" or sonic_asic_platform == "vs" %}


sonic_asic_platform [](start = 43, length = 19)

What is the future expectation on other platform?
If nothing, why need it for vs? #Closed

I believe other vendors will support the dynamic model in the future.
Meanwhile, we need this to verify this feature on vs platform.
By default, the dynamic model is disabled on vs platform and is enabled when the test cases of this feature are executed.

platform/vs/peripheral_table.j2

platform/vs/docker-sonic-vs/asic_table.json

src/sonic-config-engine/tests/sample_output/py2/buffers-dell6100.json

src/sonic-config-engine/tests/sample_output/py3/buffers-dell6100.json

src/sonic-config-engine/tests/sample_output/py2/buffers-dell6100.json

qiluo-msft

As comments

Signed-off-by: Stephen Sun <stephens@nvidia.com>

- remove vs related stuff from Mellanox specific asic_table.json and peripheral_table.json - fix minor errors Signed-off-by: Stephen Sun <stephens@nvidia.com>

qiluo-msft · 2020-12-12T19:49:41Z

platform/mellanox/peripheral_table.j2

+{%- if DEVICE_METADATA is defined and DEVICE_METADATA['localhost']['platform'] is defined %}
+{%- set platform = DEVICE_METADATA['localhost']['platform'] %}
+{%- else -%}
+{%- set platform = "vs-platform" %}


The same issue, move vs related part into platform/vs/peripheral_table.j2. Please don't mix platforms into mellanox folder. #Closed

Remove vs stuff from Mellanox related files and fix indent Signed-off-by: Stephen Sun <stephens@nvidia.com>

stephenxs · 2020-12-13T06:27:37Z

retest vs please

qiluo-msft · 2023-08-15T01:14:56Z

platform/mellanox/rules.mk

@@ -31,3 +31,5 @@ $(SYNCD)_RDEPENDS += $(MLNX_SAI)

 # Inject mlnx sdk libs to platform monitor
 $(DOCKER_PLATFORM_MONITOR)_DEPENDS += $(APPLIBS) $(SX_COMPLIB) $(SXD_LIBS) $(SX_GEN_UTILS) $(PYTHON_SDK_API) $(APPLIBS_DEV) $(SX_COMPLIB_DEV) $(SXD_LIBS_DEV) $(SX_GEN_UTILS_DEV)
+
+export SONIC_BUFFER_MODEL=dynamic


Do not change build time config in component makefile, if you need, change the pipeline command line.

Hi Qi,
Yes, it works to change the CLI option but what's the benefit to change a working code?

stephenxs added 7 commits December 6, 2020 22:24

Fix vs image building issues

2e7a61c

Signed-off-by: Stephen Sun <stephens@nvidia.com>

Always initialize buffer_model

ab20f9c

- For Mellanox, dynamic by default - For other vendors, traditional mode. Signed-off-by: Stephen Sun <stephens@nvidia.com>

Fix error in docker-orchagent/supervisor.conf

1aab411

Signed-off-by: Stephen Sun <stephens@nvidia.com>

Correct the peer MTU which should be 1k in LOSSLESS_TRAFFIC_PATTERN t…

7e6bc5d

…able Signed-off-by: Stephen Sun <stephens@nvidia.com>

buffermgrd: provide the peripheral_table.json only if it exists

f09e695

Signed-off-by: Stephen Sun <stephens@nvidia.com>

qiluo-msft reviewed Dec 12, 2020

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qiluo-msft requested a review from neethajohn December 12, 2020 02:32

qiluo-msft reviewed Dec 12, 2020

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qiluo-msft requested review from lguohan, yxieca and jleveque December 12, 2020 02:56

Fix review comments

5364a11

Signed-off-by: Stephen Sun <stephens@nvidia.com>

stephenxs requested a review from qiluo-msft December 12, 2020 04:57

Fix comments:

73431d9

- remove vs related stuff from Mellanox specific asic_table.json and peripheral_table.json - fix minor errors Signed-off-by: Stephen Sun <stephens@nvidia.com>

qiluo-msft reviewed Dec 12, 2020

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Fix review comments:

a4b8fb2

Remove vs stuff from Mellanox related files and fix indent Signed-off-by: Stephen Sun <stephens@nvidia.com>

qiluo-msft approved these changes Dec 13, 2020

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qiluo-msft merged commit e010d83 into sonic-net:master Dec 13, 2020

stephenxs deleted the dynamic-buffer-calculation branch December 13, 2020 22:21

qiluo-msft reviewed Aug 15, 2023

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[Dynamic buffer calc] Support dynamic buffer calculation #6194

[Dynamic buffer calc] Support dynamic buffer calculation #6194

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[Dynamic buffer calc] Support dynamic buffer calculation #6194

[Dynamic buffer calc] Support dynamic buffer calculation #6194

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