Re: [PATCH 0/2] scsi: add support for request batching

Stefan Hajnoczi
2019-06-10T12:36:25Z

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On Thu, May 30, 2019 at 01:28:09PM +0200, Paolo Bonzini wrote:
> This allows a list of requests to be issued, with the LLD only writing
> the hardware doorbell when necessary, after the last request was prepared.
> This is more efficient if we have lists of requests to issue, particularly
> on virtualized hardware, where writing the doorbell is more expensive than
> on real hardware.
>
> This applies to any HBA, either singlequeue or multiqueue; the second
> patch implements it for virtio-scsi.
>
> Paolo
>
> Paolo Bonzini (2):
> scsi_host: add support for request batching
> virtio_scsi: implement request batching
>
> drivers/scsi/scsi_lib.c | 37 ++++++++++++++++++++++---
> drivers/scsi/virtio_scsi.c | 55 +++++++++++++++++++++++++++-----------
> include/scsi/scsi_cmnd.h | 1 +
> include/scsi/scsi_host.h | 16 +++++++++--
> 4 files changed, 89 insertions(+), 20 deletions(-)
>
> --
> 2.21.0
>

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>

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