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| author | Richard W.M. Jones <rjones@redhat.com> | 2017-08-10 17:56:52 +0100 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2017-08-24 22:28:51 -0400 |
| commit | 582b0ab200105b06704cef6da814fbde4c2ca00b (patch) | |
| tree | 56ac16fe5cfd4459b34b7f7a49a8639c59e1ed7a /drivers/scsi/scsi_lib.c | |
| parent | 44ed8089e991a60d614abe0ee4b9057a28b364e4 (diff) | |
| download | linux-582b0ab200105b06704cef6da814fbde4c2ca00b.tar.gz linux-582b0ab200105b06704cef6da814fbde4c2ca00b.tar.xz | |
scsi: virtio: virtio_scsi: Set can_queue to the length of the virtqueue.
Since switching to blk-mq as the default in commit 5c279bd9e406
("scsi: default to scsi-mq"), virtio-scsi LUNs consume about 10x as
much kernel memory.
qemu currently allocates a fixed 128 entry virtqueue. can_queue
currently is set to 1024. But with indirect descriptors, each command
in the queue takes 1 virtqueue entry, so the number of commands which
can be queued is equal to the length of the virtqueue.
Note I intend to send a patch to qemu to allow the virtqueue size to be
configured from the qemu command line.
Signed-off-by: Richard W.M. Jones <rjones@redhat.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/scsi_lib.c')
0 files changed, 0 insertions, 0 deletions