Re: [PATCH net-next v6 00/11] net/smc: SMC intra-OS shortcut with loopback-ism

Wen Gu
2024-04-26T08:17:13Z

On 2024/4/26 15:02, Jan Karcher wrote:
>
>
> On 14/04/2024 06:02, Wen Gu wrote:
>> This patch set acts as the second part of the new version of [1] (The first
>> part can be referred from [2]), the updated things of this version are listed
>> at the end.
>>
>> - Background
>>
>> SMC-D is now used in IBM z with ISM function to optimize network interconnect
>> for intra-CPC communications. Inspired by this, we try to make SMC-D available
>> on the non-s390 architecture through a software-implemented Emulated-ISM device,
>> that is the loopback-ism device here, to accelerate inter-process or
>> inter-containers communication within the same OS instance.
>>
>> - Design
>>
>> This patch set includes 3 parts:
>>
>>   - Patch #1: some prepare work for loopback-ism.
>>   - Patch #2-#7: implement loopback-ism device and adapt SMC-D for it.
>>     loopback-ism now serves only SMC and no userspace interfaces exposed.
>>   - Patch #8-#11: memory copy optimization for intra-OS scenario.
>>
>> The loopback-ism device is designed as an ISMv2 device and not be limited to
>> a specific net namespace, ends of both inter-process connection (1/1' in diagram
>> below) or inter-container connection (2/2' in diagram below) can find the same
>> available loopback-ism and choose it during the CLC handshake.
>>
>>   Container 1 (ns1)                              Container 2 (ns2)
>>   +-----------------------------------------+    +-------------------------+
>>   | +-------+      +-------+      +-------+ |    |        +-------+        |
>>   | | App A |      | App B |      | App C | |    |        | App D |<-+     |
>>   | +-------+      +---^---+      +-------+ |    |        +-------+  |(2') |
>>   |     |127.0.0.1 (1')|             |192.168.0.11       192.168.0.12|     |
>>   |  (1)|   +--------+ | +--------+  |(2)   |    | +--------+   +--------+ |
>>   |     `-->|   lo   |-` |  eth0  |<-`      |    | |   lo   |   |  eth0  | |
>>   +---------+--|---^-+---+-----|--+---------+    +-+--------+---+-^------+-+
>>                |   |           |                                  |
>>   Kernel       |   |           |                                  |
>>   +----+-------v---+-----------v----------------------------------+---+----+
>>   |    |                            TCP                               |    |
>>   |    |                                                              |    |
>>   |    +--------------------------------------------------------------+    |
>>   |                                                                        |
>>   |                           +--------------+                             |
>>   |                           | smc loopback |                             |
>>   +---------------------------+--------------+-----------------------------+
>>
>> loopback-ism device creates DMBs (shared memory) for each connection peer.
>> Since data transfer occurs within the same kernel, the sndbuf of each peer
>> is only a descriptor and point to the same memory region as peer DMB, so that
>> the data copy from sndbuf to peer DMB can be avoided in loopback-ism case.
>>
>>   Container 1 (ns1)                              Container 2 (ns2)
>>   +-----------------------------------------+    +-------------------------+
>>   | +-------+                               |    |        +-------+        |
>>   | | App C |-----+                         |    |        | App D |        |
>>   | +-------+     |                         |    |        +-^-----+        |
>>   |               |                         |    |          |              |
>>   |           (2) |                         |    |     (2') |              |
>>   |               |                         |    |          |              |
>>   +---------------|-------------------------+    +----------|--------------+
>>                   |                                         |
>>   Kernel          |                                         |
>>   +---------------|-----------------------------------------|--------------+
>>   | +--------+ +--v-----+                           +--------+ +--------+  |
>>   | |dmb_desc| |snd_desc|                           |dmb_desc| |snd_desc|  |
>>   | +-----|--+ +--|-----+                           +-----|--+ +--------+  |
>>   | +-----|--+    |                                 +-----|--+             |
>>   | | DMB C  |    +---------------------------------| DMB D  |             |
>>   | +--------+                                      +--------+             |
>>   |                                                                        |
>>   |                           +--------------+                             |
>>   |                           | smc loopback |                             |
>>   +---------------------------+--------------+-----------------------------+
>>
>> - Benchmark Test
>>
>>   * Test environments:
>>        - VM with Intel Xeon Platinum 8 core 2.50GHz, 16 GiB mem.
>>        - SMC sndbuf/DMB size 1MB.
>>
>>   * Test object:
>>        - TCP: run on TCP loopback.
>>        - SMC lo: run on SMC loopback-ism.
>>
>> 1. ipc-benchmark (see [3])
>>
>>   - ./<foo> -c 1000000 -s 100
>>
>>                              TCP                  SMC-lo
>> Message
>> rate (msg/s)              79693                  148236(+86.01%)
>>
>> 2. sockperf
>>
>>   - serv: <smc_run> sockperf sr --tcp
>>   - clnt: <smc_run> sockperf { tp | pp } --tcp --msg-size={ 64000 for tp | 14 for pp } -i 127.0.0.1 -t 30
>>
>>                              TCP                  SMC-lo
>> Bandwidth(MBps)         4815.18                 8061.77(+67.42%)
>> Latency(us)               6.176                   3.449(-44.15%)
>>
>> 3. nginx/wrk
>>
>>   - serv: <smc_run> nginx
>>   - clnt: <smc_run> wrk -t 8 -c 1000 -d 30 http://127.0.0.1:80
>>
>>                             TCP                   SMC-lo
>> Requests/s           196555.02                263270.95(+33.94%)
>>
>> 4. redis-benchmark
>>
>>   - serv: <smc_run> redis-server
>>   - clnt: <smc_run> redis-benchmark -h 127.0.0.1 -q -t set,get -n 400000 -c 200 -d 1024
>>
>>                             TCP                   SMC-lo
>> GET(Requests/s)       88711.47                120048.02(+35.32%)
>> SET(Requests/s)       89465.44                123152.71(+37.65%)
>>
>>
>
> Hi Wen Gu,
>
> I did run the tests again with the v6 and reviewed the patchset. If you decide to address Simons nit feel free to add my:
>
> Reviewed-and-tested-by: Jan Karcher <jaka@linux.ibm.com>
>
> Thanks for your effort and contribution.
> - J

Thank you all for the review and test! I will address Simon's nit and
collect the Rb tags in the next version.

Thanks!