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XDP should use all available logical processors for user mode operation #3524

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#4857
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XDP should use all available logical processors for user mode operation#3524
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#4857
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mtfriesen
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Area: LolaRelated to low latency workPartner: SQLBy or For the SQL teamfeature requestA request for new functionality
Milestone
Future
@srsubra

Description

@srsubra
srsubra
opened on Mar 20, 2023

Describe the feature you'd like supported

During a recent test with QTIP, it was observed that the system had 4 logical processors
image

but XDP user mode polling seems to happen only for 2 of them leaving the other two underutilized as shown below

image

Proposed solution

XDP should leverage all available logical processors for user mode polling to maximize the perf.

Additional context

No response

Activity

srsubra
added
feature requestA request for new functionality
on Mar 20, 2023
nibanks
added
Area: LolaRelated to low latency work
on Mar 20, 2023
nibanks
added this to the Release 2.3 milestone on Mar 20, 2023
nibanks
added this to MsQuic Walkthroughson May 8, 2023
nibanks
moved this to Should be written in MsQuic Walkthroughson May 8, 2023
nibanks
modified the milestones: Release 2.3, Release 2.4 on Oct 12, 2023
nibanks
added
Partner: SQLBy or For the SQL team
on Mar 14, 2024
nibanks
modified the milestones: Release 2.4, Release 2.5 on Aug 29, 2024
nibanks
added this to DPT Iteration Tracker and removed this from MsQuic Walkthroughson Jan 28, 2025
nibanks
moved this to Todo in DPT Iteration Trackeron Jan 28, 2025
nibanks
modified the milestones: Release 2.5, Future on Jan 28, 2025
nibanks
assigned
mtfriesen
on Jan 28, 2025
mtfriesen

mtfriesen commented on Feb 23, 2025

@mtfriesen
mtfriesen
on Feb 23, 2025 · edited by mtfriesen
Contributor

@nibanks this machine has two cores eligible for RSS and was using those two cores according to the screenshots above. Is the ask to use hyperthreading cores for RSS or to spread the QUIC workers beyond the number of RSS cores?

For context, the default NDIS policy is to only allow RSS on physical processors, not on any additional logical processors on the system. XDP can override this (I think) but the original NDIS policy was based on measurements years ago showing no significant benefit for RSS on hyperthreading cores.

nibanks
moved this from Planned to In Progress in DPT Iteration Trackeron Feb 25, 2025
mtfriesen
linked a pull request that will close this issue on Feb 27, 2025
nibanks
moved this from In Progress to Slipped in DPT Iteration Trackeron Mar 3, 2025
nibanks
moved this from Slipped to No status in DPT Iteration Trackeron Mar 18, 2025
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Area: LolaRelated to low latency workPartner: SQLBy or For the SQL teamfeature requestA request for new functionality

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DPT Iteration Tracker

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    @mtfriesen@nibanks@srsubra

    Issue actions
      XDP should use all available logical processors for user mode operation · Issue #3524 · microsoft/msquic