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

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Message-ID: <20190610123617.GK14257@stefanha-x1.localdomain>
Date:   Mon, 10 Jun 2019 13:36:17 +0100
From:   Stefan Hajnoczi <stefanha@...il.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        jejb@...ux.ibm.com, martin.petersen@...cle.com,
        linux-scsi@...r.kernel.org, stefanha@...hat.com
Subject: Re: [PATCH 0/2] scsi: add support for request batching

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@...hat.com>

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