Revision 1978f30a87732d4d9072a20abeded9fe17884f1b authored by Dongli Zhang on 27 March 2019, 10:36:35 UTC, committed by Jens Axboe on 10 April 2019, 14:18:25 UTC
When tag_set->nr_maps is 1, the block layer limits the number of hw queues by nr_cpu_ids. No matter how many hw queues are used by virtio-scsi, as it has (tag_set->nr_maps == 1), it can use at most nr_cpu_ids hw queues. In addition, specifically for pci scenario, when the 'num_queues' specified by qemu is more than maxcpus, virtio-scsi would not be able to allocate more than maxcpus vectors in order to have a vector for each queue. As a result, it falls back into MSI-X with one vector for config and one shared for queues. Considering above reasons, this patch limits the number of hw queues used by virtio-scsi by nr_cpu_ids. Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Dongli Zhang <dongli.zhang@oracle.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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| File | Mode | Size |
|---|---|---|
| ChangeLog | -rw-r--r-- | 14.0 KB |
| Kconfig | -rw-r--r-- | 917 bytes |
| Makefile | -rw-r--r-- | 206 bytes |
| TODO | -rw-r--r-- | 385 bytes |
| befs.h | -rw-r--r-- | 3.0 KB |
| befs_fs_types.h | -rw-r--r-- | 5.0 KB |
| btree.c | -rw-r--r-- | 21.9 KB |
| btree.h | -rw-r--r-- | 343 bytes |
| datastream.c | -rw-r--r-- | 15.9 KB |
| datastream.h | -rw-r--r-- | 575 bytes |
| debug.c | -rw-r--r-- | 7.1 KB |
| endian.h | -rw-r--r-- | 3.2 KB |
| inode.c | -rw-r--r-- | 1.2 KB |
| inode.h | -rw-r--r-- | 120 bytes |
| io.c | -rw-r--r-- | 1.4 KB |
| io.h | -rw-r--r-- | 110 bytes |
| linuxvfs.c | -rw-r--r-- | 25.6 KB |
| super.c | -rw-r--r-- | 3.3 KB |
| super.h | -rw-r--r-- | 131 bytes |
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