[NetDev-People] 0x14: nutsnbolts talk, Storage application performance boost with zero thrashing networking stack

Jamal Hadi Salim jhs at mojatatu.com
Wed Jan 29 00:57:16 UTC 2020

There has been an ongoing effort in the community to get Zero-copy
working over the last few years - with much success.
While both MSG_ZEROCOPY (zero copy transmit) and socket mmap (zero copy
receive) have been out in the wild for sometime now, there are no known
high scale open source application consumers of these interfaces.

In this talk, Or Gerlitz will describe how he makes use of these
interfaces to integrate into spdk(https://spdk.io/) - an open source
storage framework which uses sockets for nvme-over-tcp in a smart NIC
environment. The goal is to use kernel uAPIs while achieving high scale

Or will delve into MSG_ZEROCPOY and the challenges that he had to
deal with. He will describe the need for an app author to understand and
how to best tie-in their app state machine to the interfaces:
to address both transactions responses from the peer app and zero-copy
notifications from the local socket provider. Should the app use ZC with
all or nothing approach or sometimes yes and other-times no?
Come to the talk to get the answer and advise on how to effectively use
these interfaces.

In addition Or will spend time going into the performance analysis
details correlating I/O performance visavis CPU cost (which is often
tricky to get right with traditional tools like profiler/flame-graphs).

More info:

Reminder, registration is now open and early bird is still in effect.


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