Hello folks,
The os-acc spec [1] has been updated substantially. Please review the
new version is https://review.openstack.org/#/c/577438/ .
The background for the update is that several important aspects were
raised as comments on the previous spec ([1], [2]). An alternative
workflow for attaching accelerators to instances was proposed [3], to
which I responded with [4] and [5]. Finally, with another IRC discussion
[6], it was concluded that the design/flow in [4], [5] fits the bill.
The new version of the os-acc spec incorporates that discussion.
The main points that were raised and addressed are these:
* Some architectures like Power treat devices differently. The os-acc
framework must provide for plugins to handle such variation. Done.
* The os-acc framework should be more closely patterned after the os-vif
framework and Neutron flow. This is a bit debatable since Neutron ports
and Cyborg accelerators differ in some key respects, though the os-acc
library can be structured like os-vif. I have attempted to compare and
contrast the os-vif and os-acc approaches.
This discussion is important because we may have programmable NICs based
on FPGAs. Then Cyborg, Neutron and Nova are going to get tangled in a
triangle. (If you throw Glance in for FPGA images, that leads quickly to
a quadrilateral. Add Cinder for storage-related FPGA devices, and we get
pulled into a pentagram. Geometry is scary. Just saying. ;-} )
* Not enough detail in [1]. Mea culpa. Hopefully fixed now.
[1] https://review.openstack.org/#/c/566798/
[2]
http://eavesdrop.openstack.org/irclogs/%23openstack-nova/%23openstack-nova.2018-06-14.log.html#t2018-06-14T18:38:28
[3]
https://review.openstack.org/#/c/575545/1/specs/rocky/approved/nova-cyborg-flow.rst
[4] https://etherpad.openstack.org/p/os-acc-discussion
[5]
https://docs.google.com/drawings/d/1gbfimiyA1f5sTeobN9mpavEkHT7Z_ScNUqimOkdIYGA/edit
[6]
http://eavesdrop.openstack.org/irclogs/%23openstack-nova/%23openstack-nova.2018-06-18.log.html#t2018-06-18T22:07:02
Regards,
Sundar
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