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charset="us-ascii" Content-Transfer-Encoding: quoted-printable This meeting is a follow-up to the previous calls in March and the discussi= on which has happened since on the DPDK and OVS mailing lists. Three approaches were presented in the previous calls: * "Defer work": Handle DMA completions at OVS PMD thread level * "v3": Handle DMA Tx completions from Rx context. * "v3 + lockless ring": Handle DMA Tx completions from Rx context + l= ockless ring to avoid contention. After these calls, the discussion continued on the DPDK and OVS mailing lis= ts, where an alternate approach has been proposed. The newly-suggested approach: * "DMA VirtQ Completions": Add an additional transaction(s) to each b= urst of DMA copies; a special transaction containing the memory write opera= tion that makes the descriptors available to the Virtio driver. Also separa= te the actual kick of the guest with the data transfer. Agenda for call 26th April: * Intel team will present slides to help understand the differences i= n architecture/designs. * Discuss the strengths/weaknesses/feasibility of the "DMA VirtQ Comp= letions" approach, comparing to current best-candidate "Defer Work". * Work toward single-solution to be accepted upstream in DPDK and OVS Google Meet link and slides to follow. --_000_DM6PR11MB322783EE11F1E1753020A6CDFCF49DM6PR11MB3227namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable
This meeting is a follow-up to the previous calls in March and the dis= cussion which has happened since on the DPDK and OVS mailing lists.
 
Three approaches were presented in the previous calls:
 
  • "Defer work": Handle DMA completions at OVS PMD thread level<= /li>
  • "v3": Handle DMA Tx completions from Rx context.
  • = "v3 + lockless ring": Handle DMA Tx completions from Rx context += lockless ring to avoid contention.
 
After these calls, the discussion continued on the DPDK and OVS mailin= g lists, where an alternate approach has been proposed.
 
The newly-suggested approach:
 
  • "DMA VirtQ Completions": Add an additional transaction(s) to = each burst of DMA copies; a special transaction containing the memory write= operation that makes the descriptors available to the Virtio driver. Also = separate the actual kick of the guest with the data transfer.
 
Agenda for call 26th April:
 
  • Intel team will present slides to help understand the differences in ar= chitecture/designs.
  • Discuss the strengths/weaknesses/feasibility of= the "DMA VirtQ Completions" approach, comparing to current best-= candidate "Defer Work".
  • Work toward single-solution to be= accepted upstream in DPDK and OVS
 
Google Meet link and slides to follow.
 
 
 
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