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A GET read() that misses the page cache blocks the hub,\nstalling every other request on the worker - even cache hits. Using\ncooperative_period does not help: a yield cannot wake a thread stuck in\nread().\n\nA new opt-in read_offload \u003d true runs each read+md5 burst on a\nthread-pool worker; the requesting greenlet green-blocks on the result\nwhile the hub keeps serving others. os.pread() and hashlib.update() both\nrelease the GIL, so the disk wait and the etag hashing run off the hub\n(a serial hub-side md5 would otherwise become the next bottleneck under\nconcurrency).\n\nOnly reads of at least read_offload_min_size (default one burst) are\noffloaded; smaller reads, and small ranges of big objects, stay on the\ndirect path, where a single sub-burst handoff would only add cost.\n\nUnlike the old threads_per_disk (which offloaded every 64 KiB read),\neach offload is a 1 MiB burst, so the handoff stays cheap even on a\ncache hit. A per-device cap limits how many pool threads one slow disk\ncan take from the process-global pool.\n\nDefaults to off (behaviour unchanged).\n\nCo-Authored-By: Claude Opus 4.8 \u003cnoreply@anthropic.com\u003e\nChange-Id: I377cad02c76942d654cfc8f32606b5f4a25b77ca\nSigned-off-by: Christian Schwede \u003ccschwede@mailbox.org\u003e\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/swift/commit/70a5bf7e702b2b71d1ca4682f38adf030946b622"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/swift/commit/70a5bf7e702b2b71d1ca4682f38adf030946b622"}]},"branch":"refs/heads/master"},"8096eb6994f1a2c467ed11c944b84b182595c06a":{"kind":"REWORK","_number":2,"created":"2026-06-16 13:52:50.000000000","uploader":{"_account_id":6968,"name":"Christian Schwede","email":"cschwede@nvidia.com","username":"cschwede"},"ref":"refs/changes/96/993396/2","fetch":{"anonymous http":{"url":"https://review.opendev.org/openstack/swift","ref":"refs/changes/96/993396/2","commands":{"Checkout":"git fetch https://review.opendev.org/openstack/swift refs/changes/96/993396/2 \u0026\u0026 git checkout FETCH_HEAD","Cherry Pick":"git fetch https://review.opendev.org/openstack/swift refs/changes/96/993396/2 \u0026\u0026 git cherry-pick FETCH_HEAD","Format Patch":"git fetch https://review.opendev.org/openstack/swift refs/changes/96/993396/2 \u0026\u0026 git format-patch -1 --stdout FETCH_HEAD","Pull":"git pull https://review.opendev.org/openstack/swift refs/changes/96/993396/2"}}},"commit":{"parents":[{"commit":"bab1688e2c91cb9866c714ee77bb8c45f6885e7b","subject":"obj/diskfile: self-document _drop_cache offset for ranged GET reads","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/swift/commit/bab1688e2c91cb9866c714ee77bb8c45f6885e7b"}]}],"author":{"name":"Christian Schwede","email":"cschwede@mailbox.org","date":"2026-06-15 15:26:35.000000000","tz":120},"committer":{"name":"Christian Schwede","email":"cschwede@mailbox.org","date":"2026-06-16 13:24:17.000000000","tz":120},"subject":"Offload reads in the object server","message":"Offload reads in the object server\n\nAn object-server worker serves all its concurrent requests on one\neventlet hub. A GET read() that misses the page cache blocks the hub,\nstalling every other request on the worker - even cache hits. Using\ncooperative_period does not help: a yield cannot wake a thread stuck in\nread().\n\nA new opt-in read_offload \u003d true runs each read+md5 burst on a\nthread-pool worker; the requesting greenlet green-blocks on the result\nwhile the hub keeps serving others. os.pread() and hashlib.update() both\nrelease the GIL, so the disk wait and the etag hashing run off the hub\n(a serial hub-side md5 would otherwise become the next bottleneck under\nconcurrency).\n\nOnly reads of at least read_offload_min_size (default one burst) are\noffloaded; smaller reads, and small ranges of big objects, stay on the\ndirect path, where a single sub-burst handoff would only add cost.\n\nUnlike the old threads_per_disk (which offloaded every 64 KiB read),\neach offload is a 1 MiB burst, so the handoff stays cheap even on a\ncache hit. A per-device cap limits how many pool threads one slow disk\ncan take from the process-global pool.\n\nDefaults to off (behaviour unchanged).\n\nCo-Authored-By: Claude Opus 4.8 \u003cnoreply@anthropic.com\u003e\nChange-Id: I377cad02c76942d654cfc8f32606b5f4a25b77ca\nSigned-off-by: Christian Schwede \u003ccschwede@mailbox.org\u003e\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/swift/commit/8096eb6994f1a2c467ed11c944b84b182595c06a"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/swift/commit/8096eb6994f1a2c467ed11c944b84b182595c06a"}]},"branch":"refs/heads/master"},"6d0bb8e24350c13f2b6931bf751d4add605a15eb":{"kind":"REWORK","_number":3,"created":"2026-08-04 11:08:41.000000000","uploader":{"_account_id":6968,"name":"Christian Schwede","email":"cschwede@nvidia.com","username":"cschwede"},"ref":"refs/changes/96/993396/3","fetch":{"anonymous http":{"url":"https://review.opendev.org/openstack/swift","ref":"refs/changes/96/993396/3","commands":{"Checkout":"git fetch https://review.opendev.org/openstack/swift refs/changes/96/993396/3 \u0026\u0026 git checkout FETCH_HEAD","Cherry Pick":"git fetch https://review.opendev.org/openstack/swift refs/changes/96/993396/3 \u0026\u0026 git cherry-pick FETCH_HEAD","Format Patch":"git fetch https://review.opendev.org/openstack/swift refs/changes/96/993396/3 \u0026\u0026 git format-patch -1 --stdout FETCH_HEAD","Pull":"git pull https://review.opendev.org/openstack/swift refs/changes/96/993396/3"}}},"commit":{"parents":[{"commit":"bab1688e2c91cb9866c714ee77bb8c45f6885e7b","subject":"obj/diskfile: self-document _drop_cache offset for ranged GET reads","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/swift/commit/bab1688e2c91cb9866c714ee77bb8c45f6885e7b"}]}],"author":{"name":"Christian Schwede","email":"cschwede@mailbox.org","date":"2026-08-04 11:03:14.000000000","tz":120},"committer":{"name":"Christian Schwede","email":"cschwede@mailbox.org","date":"2026-08-04 11:03:14.000000000","tz":120},"subject":"Offload reads in the object server","message":"Offload reads in the object server\n\nAn object-server worker serves all its concurrent requests on one\neventlet hub, so a GET read() that misses the page cache stalls every\nother request on that worker - including cache hits. cooperative_period\ndoes not help: a yield cannot wake a greenlet whose thread is stuck in\nread().\n\nWith read_offload \u003d true, each read+md5 burst runs on an eventlet\nthread-pool worker; the requesting greenlet green-blocks on the result\nwhile the hub keeps serving others. os.pread() and hashlib.update() both\nrelease the GIL, so the disk wait and the etag hashing both leave the\nhub. Hashing has to move too, or a serial hub-side md5 becomes the next\nbottleneck.\n\nEach offload is one read_offload_burst_size burst, 1 MiB by default. The\nold threads_per_disk handed off every 64 KiB read, which cost more than\nit saved on a cache hit.\n\nread_offload_min_size (default one burst) keeps smaller reads on the\nhub, where a single sub-burst handoff would not pay off. It is measured\non what the GET transfers, so a small range of a big object counts as\nsmall. Tuning it trades one end of the latency distribution for the\nother: lower offloads shorter GETs and costs average latency, higher\nleaves more reads on the hub and costs tail latency. It cannot gate on\ncache residency - unknowable before reading - so a large page-cache hot\nobject is offloaded too. This reduces the odds of a slow read() blocking\nother GETs; it does not eliminate them.\n\nThe thread pool is process-global and shared with the fsync offload, so\nread_offload_max_inflight_per_device bounds what one device can take\nfrom it and keeps a sick disk from starving the healthy ones. With\nservers_per_port each disk usually gets its own process and pool, so the\ncap is largely redundant there; what matters instead is\neventlet_tpool_num_threads, whose auto default of 1 would serialize\nevery offloaded read behind fsync. The server now warns at startup when\nthe pool is smaller than the per-device cap.\n\n_inner_iter() is split into a shared _iter_bursts() plus _direct_bursts()\nand _offload_bursts(), and EC per-chunk fragment validation is split out\nof _update_checks() so it keeps running on the hub, where it can\nquarantine. The direct path is unchanged.\n\nDefaults to off. Whole-object GETs served by splice never reach this\npath.\n\nCo-Authored-By: Claude Opus 4.8 \u003cnoreply@anthropic.com\u003e\nChange-Id: I377cad02c76942d654cfc8f32606b5f4a25b77ca\nSigned-off-by: Christian Schwede \u003ccschwede@mailbox.org\u003e\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/swift/commit/6d0bb8e24350c13f2b6931bf751d4add605a15eb"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/swift/commit/6d0bb8e24350c13f2b6931bf751d4add605a15eb"}]},"branch":"refs/heads/master"}},"requirements":[],"submit_records":[{"rule_name":"gerrit~DefaultSubmitRule","status":"OK","labels":[{"label":"Verified","status":"MAY","applied_by":{"_account_id":22348,"name":"Zuul","username":"zuul","tags":["SERVICE_USER"]}},{"label":"Code-Review","status":"MAY"},{"label":"Workflow","status":"MAY"}]}],"submit_requirements":[{"name":"Verified","description":"Verified in gate by CI","status":"UNSATISFIED","is_legacy":false,"submittability_expression_result":{"expression":"label:Verified\u003dMAX AND -label:Verified\u003dMIN","fulfilled":false,"status":"FAIL","passing_atoms":[],"failing_atoms":["label:Verified\u003dMAX","label:Verified\u003dMIN"],"atom_explanations":{"label:Verified\u003dMAX":"","label:Verified\u003dMIN":""}}},{"name":"Code-Review","description":"Code reviewed by core reviewer","status":"UNSATISFIED","is_legacy":false,"submittability_expression_result":{"expression":"label:Code-Review\u003dMAX AND -label:Code-Review\u003dMIN","fulfilled":false,"status":"FAIL","passing_atoms":[],"failing_atoms":["label:Code-Review\u003dMAX","label:Code-Review\u003dMIN"],"atom_explanations":{"label:Code-Review\u003dMAX":"","label:Code-Review\u003dMIN":""}}},{"name":"Workflow","description":"Approved for gate by core reviewer","status":"UNSATISFIED","is_legacy":false,"submittability_expression_result":{"expression":"label:Workflow\u003dMAX AND -label:Workflow\u003dMIN","fulfilled":false,"status":"FAIL","passing_atoms":[],"failing_atoms":["label:Workflow\u003dMAX","label:Workflow\u003dMIN"],"atom_explanations":{"label:Workflow\u003dMAX":"","label:Workflow\u003dMIN":""}}}]}