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| author | Asias He <asias@redhat.com> | 2013-02-06 13:20:59 +0800 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2013-02-13 11:30:14 -0800 |
| commit | 1b7f390eb3bfc197c979c5478eadbc2a90f07667 (patch) | |
| tree | 969efecaf717e4d94b55eaaa5a3fc2f678956459 /drivers/vhost/tcm_vhost.h | |
| parent | 67e18cf9ab21648a477e91e0d3cb6dbdb1330262 (diff) | |
| download | linux-1b7f390eb3bfc197c979c5478eadbc2a90f07667.tar.gz linux-1b7f390eb3bfc197c979c5478eadbc2a90f07667.tar.bz2 linux-1b7f390eb3bfc197c979c5478eadbc2a90f07667.zip | |
tcm_vhost: Multi-queue support
This adds virtio-scsi multi-queue support to tcm_vhost. In order to use
multi-queue, guest side multi-queue support is need. It can
be found here:
https://lkml.org/lkml/2012/12/18/166
Currently, only one thread is created by vhost core code for each
vhost_scsi instance. Even if there are multi-queues, all the handling of
guest kick (vhost_scsi_handle_kick) are processed in one thread. This is
not optimal. Luckily, most of the work is offloaded to the tcm_vhost
workqueue.
Some initial perf numbers:
1 queue, 4 targets, 1 lun per target
4K request size, 50% randread + 50% randwrite: 127K/127k IOPS
4 queues, 4 targets, 1 lun per target
4K request size, 50% randread + 50% randwrite: 181K/181k IOPS
Signed-off-by: Asias He <asias@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/vhost/tcm_vhost.h')
| -rw-r--r-- | drivers/vhost/tcm_vhost.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/vhost/tcm_vhost.h b/drivers/vhost/tcm_vhost.h index 519a5504d347..1d2ae7a60e11 100644 --- a/drivers/vhost/tcm_vhost.h +++ b/drivers/vhost/tcm_vhost.h @@ -23,6 +23,8 @@ struct tcm_vhost_cmd { struct virtio_scsi_cmd_resp __user *tvc_resp; /* Pointer to vhost_scsi for our device */ struct vhost_scsi *tvc_vhost; + /* Pointer to vhost_virtqueue for the cmd */ + struct vhost_virtqueue *tvc_vq; /* Pointer to vhost nexus memory */ struct tcm_vhost_nexus *tvc_nexus; /* The TCM I/O descriptor that is accessed via container_of() */ |