** Description changed: *********** SRU TEMPLATE AT THE BOTTOM ************** When Cinder volume service creates a volume from an image, it will download an image from Glance to a cinder-volume unit (to be precise, when CoW is not available by the backend between Glance and Cinder). The image fetch speed is not super fast as of today: 2023-05-17 02:52:28.275 158391 DEBUG cinder.image.image_utils [req-e4234307-ae7c-4220-a10a-15760679ac01 a32b8e6ed20f484eba8ddae8f7b6eb1e 08dd29cd8676470c8e0b73d2667f8cf0 - - -] Image fetch details: dest /var/lib/cinder/conversion/image_fetch_741953c3-08f7-43b6-b423-2be938ac8d02_bc1hvgd7cinder@cinder-ceph, size 1907.35 MB, duration 27.80 sec fetch /usr/lib/python3/dist-packages/cinder/image/image_utils.py:637 2023-05-17 02:52:28.275 158391 INFO cinder.image.image_utils [req-e4234307-ae7c-4220-a10a-15760679ac01 a32b8e6ed20f484eba8ddae8f7b6eb1e 08dd29cd8676470c8e0b73d2667f8cf0 - - -] Image download 1907.35 MB at 68.61 MB/s -> ~ 549 Mbps By running a profiler, it looks like serious_integrity_iter (glanceclient/common/utils.py) is consuming a lot of CPU cycles on the client side (in this case the cinder-volume unit). Image caching can overcome this kind of challenges but this report is for when we need to download images (new images, updated images, etc.). https://docs.openstack.org/cinder/latest/admin/image-volume-cache.html - =============== SRU DESCRIPTION =============== [Impact] - TBD + This issue causes images to be download much slower than they should, + causing VM creation to potentially time out if the image is too big and + takes too long. The fix proposed greatly improves performance and + prevents timeouts in most cases where it would timeout without the fix. [Test case] TBD [Where problems could occur] TBD [Other Info] TBD
** Patch added: "lp2020139_jammy.debdiff" https://bugs.launchpad.net/ubuntu/jammy/+source/python-openstacksdk/+bug/2020139/+attachment/5878881/+files/lp2020139_jammy.debdiff -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2020139 Title: [SRU] Image fetch speed from Glance to Cinder volume service can be slow and capped by client CPU To manage notifications about this bug go to: https://bugs.launchpad.net/cloud-archive/+bug/2020139/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
