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Message-ID: <3f2a7456-c310-4fdc-a507-896fcaaad454@linux.alibaba.com>
Date: Fri, 26 Apr 2024 16:17:08 +0800
From: Wen Gu <guwen@...ux.alibaba.com>
To: Jan Karcher <jaka@...ux.ibm.com>, wintera@...ux.ibm.com,
twinkler@...ux.ibm.com, hca@...ux.ibm.com, gor@...ux.ibm.com,
agordeev@...ux.ibm.com, davem@...emloft.net, edumazet@...gle.com,
kuba@...nel.org, pabeni@...hat.com, wenjia@...ux.ibm.com
Cc: borntraeger@...ux.ibm.com, svens@...ux.ibm.com,
alibuda@...ux.alibaba.com, tonylu@...ux.alibaba.com,
linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
netdev@...r.kernel.org
Subject: Re: [PATCH net-next v6 00/11] net/smc: SMC intra-OS shortcut with
loopback-ism
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@...ux.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!
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