nvme: drop the S3X single-outstanding-I/O quirk
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Authored by seuros on Mon, Aug 24, 6:20 PM.

Details

Reviewers

ngie
adrian
imp

Summary

The quirk's 8KB transfer clamp exposed raw character-device I/O to
the oversized-mapping stall fixed earlier, and its single tracker
turned a stranded request into a complete I/O stall. Without it an
S3X controller runs 128 trackers at its MDTS-derived transfer size
with no retries, failures, or timeouts, at about seven times the
serialized throughput.

Approved by: ngie (co-mentor)

Diff Detail

Repository

rG FreeBSD src repository

Lint

Lint Passed

Unit

No Test Coverage

Build Status

Buildable 76115
Build 72998: arc lint + arc unit

Event Timeline

seuros created this revision.Mon, Aug 24, 6:20 PM

Herald added subscribers: dab, imp. · View Herald TranscriptMon, Aug 24, 6:20 PM

seuros requested review of this revision.Mon, Aug 24, 6:20 PM

Harbormaster completed remote builds in B76061: Diff 184924.Mon, Aug 24, 6:20 PM

seuros added reviewers: ngie, adrian, imp.Mon, Aug 24, 6:23 PM

seuros added a parent revision: D59155: nvme: program the arbitration burst from Identify RAB.

rebase

Harbormaster completed remote builds in B76115: Diff 184992.Tue, Aug 25, 6:35 AM

imp accepted this revision.Tue, Aug 25, 6:55 PM

This revision is now accepted and ready to land.Tue, Aug 25, 6:55 PM

My MacBookPro13,1 boots with this patch set and feels much snappier than before (didn't measure it though). Great job!

@seuros: please add:

Approved by: ngie (co-mentor)

to your commit message and add an appropriate MFC after: time. A change like this should probably get "3 days", "1 week", etc -- higher seems a bit unnecessary :).

Let @adrian or I know if you need help staging this change using git arc!

seuros edited the summary of this revision. (Show Details)Tue, Sep 1, 6:27 PM

adrian accepted this revision.Tue, Sep 1, 6:40 PM

eduardo added a subscriber: eduardo.Wed, Sep 2, 7:49 PM