On Mon, Sep 9, 2024 at 11:30 AM Dragos Tatulea <dtatulea@xxxxxxxxxx> wrote: > > > > On 30.08.24 12:58, Dragos Tatulea wrote: > > This series improves the time of .set_map() operations by parallelizing > > the MKEY creation and deletion for direct MKEYs. Looking at the top > > level MKEY creation/deletion functions, the following improvement can be > > seen: > > > > |-------------------+-------------| > > | operation | improvement | > > |-------------------+-------------| > > | create_user_mr() | 3-5x | > > | destroy_user_mr() | 8x | > > |-------------------+-------------| > > > > The last part of the series introduces lazy MKEY deletion which > > postpones the MKEY deletion to a later point in a workqueue. > > > > As this series and the previous ones were targeting live migration, > > we can also observe improvements on this front: > > > > |-------------------+------------------+------------------| > > | Stage | Downtime #1 (ms) | Downtime #2 (ms) | > > |-------------------+------------------+------------------| > > | Baseline | 3140 | 3630 | > > | Parallel MKEY ops | 1200 | 2000 | > > | Deferred deletion | 1014 | 1253 | > > |-------------------+------------------+------------------| > > > > Test configuration: 256 GB VM, 32 CPUs x 2 threads per core, 4 x mlx5 > > vDPA devices x 32 VQs (16 VQPs) > > > > This series must be applied on top of the parallel VQ suspend/resume > > series [0]. > > > > [0] https://lore.kernel.org/all/20240816090159.1967650-1-dtatulea@xxxxxxxxxx/ > > > > --- > > v2: > > - Swapped flex array usage for plain zero length array in first patch. > > - Updated code to use Scope-Based Cleanup Helpers where appropriate > > (only second patch). > > - Added macro define for MTT alignment in first patch. > > - Improved commit messages/comments based on review comments. > > - Removed extra newlines. > Gentle ping for the remaining patches in v2. > Same here, this series is already in MST's branch: https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git/commit/?h=vhost&id=d424b079e243128383e88bee79f143ff30b4ec62
