Hi All,

Thanks for the good discussion today! Below are my notes.

Thanks,
Brenden

=== Discussion ===

Michael:
* https://github.com/savisko/katran/tree/xdp_off
* Mellanox presentation on XDP + Katran
* offload tc XDP programs to hardware nic
* Example application: Katran from Facebook
* Control is implemented as a C++ library (example is open source)
* Katran DP already implemented in XDP
* Parsing + extract flow ID
* lookup key generation
* counter update
* packet modified to forward to other IP
* Accelerate marking of flows in hardware
* XDP metadata to pass mark field from hardware to xdp program
* struct xdp_md_mark {
__u32 mark)
};
* if (mark_ptr + 1 <= data)
markID = mark_ptr->mark;
* per-CPU XDP map to convert mark -> real flow information
mark == 0 implies new flow
* original XDP slow-path has get_packet_dst() to create LRU mapping
* modified version uses perf event output to notify acceleration helper to
install flow mark in hardware
* perf results:
100 flows: 40+% performance improvements
10k flows: 0-50% performance improvements depending on #rx queues used
Software: 25Mpps
Hardware: 37-39Mpps
* considering changing implementation to mark real server instead of flow
id, to reduce number of entries kept in L1 cache

Yonghong:
* Compile once run anywhere work continues
* bitfield handling bugs in IR/debuginfo

Daniel:
* Global support work continues
* BTF side patches submitted to bpf mailing list
* tests included

Jiong:
* 32 bit patch set
* test methodology improvements
* updated patches later in the week
* some concerns around shifts, to be addressed in later improvements

Andrii:
* BTF and compile-once work integration
to share prototype tool with Saeed

Brendan:
* Is there a tool to measure queue latency in qdisc->netdev layer?
* debian/ubuntu are packaging bpftrace
* except libbcc renamed to libbpf_cc
* some issues with mixing iovisor's libbcc and debian's

Jesper:
* Fedora adding packaging support for libbpf

Alexei:
* systemd also adding support for libbpf - link to be provided?

=== Attendees ===
Brenden Blanco
Andril Nakryiko
Daniel Borkmann
Jesper Brouer
Jiong Wang
Marco Leogrande
Michael Savisko
Paul Chaignon
Quentin Monnet
Alexei Starovoitov
Saeed
Flavio
Rony
Jonathan Lemon
Brendan Gregg
Dan Siemon
Joe Stringer
John