Difference between revisions of "VPP/AArch64"

Revision as of 15:32, 30 November 2017

Meeting Details

Weekly on Wednesdays, 8-9am PT. FD.io Zoom Meeting room

Join from PC, Mac, Linux, iOS or Android: https://zoom.us/j/5301185804 or https://zoom.us/my/fastdata

Or iPhone one-tap (US Toll):  +14086380968,,5301185804# or +16465588656,,5301185804#

Or Telephone:
    Dial: +1 408 638 0968 (US Toll) or +1 646 558 8656 (US Toll)
    +1 855 880 1246 (US Toll Free)
    +1 877 369 0926 (US Toll Free)
    Meeting ID: 530 118 5804
    International numbers available: https://zoom.us/zoomconference?m=ppBOQMQTVxGYmbxNsVemC6KNo8eX2ptF

IRC Channel

#fdio-arm on freenode.net

Recent Patches

Might want to have a look at this patch which adds "make config"

https://gerrit.fd.io/r/#/c/9200/

Also this other patch proposal (probably not as complete) allows to toggle off some parts of the code such as libvom, and therefore allows compilation on small systems

https://gerrit.fd.io/r/#/c/9186/

Known Issues

Compilation may fail on systems with less than 1GB memory per core. One workaround is to search for -j in build-root/Makefile and multiply by 1 instead of 2.

GCC 5.3.x ICEs during FP register allocation. Please use GCC 5.4+.

Unit tests

Timing consideration on platform: Hierofalcon with Cortex-A57 & Fedora 26

Issues

1. Random initialization failures; "Map SVM regions at a sane offset on arm64" is committed

2. Some tests need timeout finetuning:

Example test_cflow_packet:

assertAlmostEqual(cflow[IPFIX].exportTime, nowUTC, delta=5)

Test order

Some tests are not meant to be played alone.

For example the test_l2bd_arp_term_\d+ list

• test_1: create 5 hosts
• test_2: delete 3 of the hosts created by test_1

...

Those tests should be played grouped. For example in the case above ;

# works
make test TEST=*.TestL2bdArpTerm.*
# does not work
make test V=1 TEST=*.TestL2bdArpTerm.test_l2bd_arp_term_01
make test V=1 TEST=*.TestL2bdArpTerm.test_l2bd_arp_term_02
...

Packaging

CSIT func & perf

https://wiki.fd.io/view/CSIT/AArch64#TODO

AArch64 Porting & Tuning

• Review use of Arm architected timer in src/vppinfra/time.[ch]
  • https://gerrit.fd.io/r/#/c/5796/

Review use of __sync_xxx/__atomic_xxx builtins to ensure correct memory ordering on non-TSO machines.

• Investigate hash performance (CRC32 vs xxhash) e.g. in src/vppinfra/bihash_8_8.h. Dependent on Arm CPU feature detection.
  • https://gerrit.fd.io/r/#/c/6956/
  • https://gerrit.fd.io/r/#/c/9418/

Investigate memcpy performance (src/vppinfra/string.h); both inlined-by-compiler and libc versions.

Investigate dual/quad loop tuning, e.g. l2_forward().

SIMD

• CLIB_HAVE_VEC128 also covers 256-bit. Add CLIB_HAVE_VEC256?
• ixge.[ch] - 128-bit vector types with plain C. Needs to be enabled.
• mheap.c - requires NEON implementation of is_equal
• hash.h - requires NEON implementation of irotate
• vnet_classify.h - 128-bit vector types with plain C. Needs to be enabled.
• vhost-user.c - SSE4.2 only. Implement range search using NEON.
• ip4_mtrie.h - 128-bit vector types with plain C. Needs to be enabled.

Meeting Minutes

11/29/2017

• Can we access the OD1000 in csit lab ?
  • currently mainly working with VMs
• added dedicated wiki page for CSIT : https://wiki.fd.io/view/CSIT/AArch64
• WIP : https://gerrit.fd.io/r/#/c/9474/

11/22/2017

• VPP CI
  • 3 ThunderX for Chrismas
• CSIT
  • func on VM vs perfs on HW
  • func on x86 VMs OK with 2 nodes
  • DPDK integration WIP : https://gerrit.fd.io/r/#/c/9474/
  • issues
    • how to access the lab ?
• Next steps
  • VPP
  • CSIT
    • structure work & send email (Gabriel)
    • is xxhash vs crc32 finished ? (Gabriel)
    • ask Maciek & setup a presentation meeting with someone from CSIT (Tina)
    • find a time to reschedule this meeting before the CSIT weekly call (Brian)

11/15/2017

• VPP upstream status
  • build && build-release OK
  • "make test" && "make test-debug" OK
  • packaging:
    • Ubuntu 16.04 OK
    • Ubuntu 17.10 ? (TBC)
    • fedora-26 OK
• vpp continuous test
  • all task required for jenkin's "verify" job are ready
  • TODO: request gerrit hook to Dave Barachs / vpp-dev (NB & GG)
  • set up ci in fdio lab
• CSIT
  • setting up env
  • ThunderX platforms should arrive this week
  • csit work sharing

11/8/2017

• Unit tests
  • Tests pass except for random initialization failures
  • Need to hear back from upstream about Extended unit tests
• Should we run plugins such as NSH SFC?
• Hardware to lab
  • Huawei h/w stalled
  • 3x ThunderX shipping to FD.io lab
• CSIT replication
  • Cavium replicating on ThunderX2; getting started
• Let's track our work in Jira; Brian to migrate tasks to Jira

10/25/2017

• Gabriel working on vpp init failure in linux_pci_init()
• Kumar to check with GeorgeZ on Huawei boards shipped to CSIT; need to verify tests also on this environment (package versions from distro)
• Brian to check whether anything else needs to be done besides 'make test' for upstream enablement