Re: [win-pv-devel] [PATCH 0/9] Implement VBD multi-queue

[Paul Durrant <Paul.Durrant@xxxxxxxxxx>]

> -----Original Message-----
> From: win-pv-devel [mailto:win-pv-devel-bounces@xxxxxxxxxxxxxxxxxxxx] On
> Behalf Of Owen Smith
> Sent: 29 May 2018 11:07
> To: win-pv-devel@xxxxxxxxxxxxxxxxxxxx
> Cc: Owen Smith <owen.smith@xxxxxxxxxx>
> Subject: [win-pv-devel] [PATCH 0/9] Implement VBD multi-queue
> 
> This series adds support for VBD multi-queue as defined by the updated
> blkif.h
> 
> Multi-queue will split the incomming SRB requests into seperate shared
> rings, attempting to keep processing on a single vCPU. Ths backend should
> use this per-processor shared ring to direct requests into the multi-queue
> block layer (blk-mq) to improve scalability. Part of the changes involves
> reducing the usage of spinlocks on the hot-path.
> 
> The implementation changes to the ring's processing algorithm has shown
> some improvements, but this does not scale with number of queues (i.e.
> using
> this patch series with a single queue shows an improvment, but adding more
> queues does not show any differences outside of sampling noise).
> 
> Owen Smith (9):
>   Update blkif.h to upstream
>   Query "multi-queue-max-queues"
>   Remove RingTrigger
>   Dont close ring during FrontendReset
>   Force single queue in crash/hibernate path
>   Implement multi-queues
>   Remove queue.h/.c
>   Move query of "multi-queue-max-queues" to driver.c
>   Set StorPortInitializePerfOpts
> 

Patches 2-9 applied. Thanks,

  Paul

>  include/xen/io/blkif.h       | 1100 ++++++++-------
>  src/xencrsh/frontend.c       |    2 +
>  src/xenvbd/adapter.c         |   56 +
>  src/xenvbd/driver.c          |   25 +-
>  src/xenvbd/driver.h          |    6 +
>  src/xenvbd/frontend.c        |  261 ++--
>  src/xenvbd/frontend.h        |    2 +
>  src/xenvbd/queue.c           |  139 --
>  src/xenvbd/queue.h           |   86 --
>  src/xenvbd/ring.c            | 3106 +++++++++++++++++++++++++----------------
> -
>  src/xenvbd/ring.h            |    5 -
>  src/xenvbd/target.c          |    1 -
>  vs2015/xenvbd/xenvbd.vcxproj |    1 -
>  vs2017/xenvbd/xenvbd.vcxproj |    1 -
>  14 files changed, 2686 insertions(+), 2105 deletions(-)
>  delete mode 100644 src/xenvbd/queue.c
>  delete mode 100644 src/xenvbd/queue.h
> 
> --
> 2.16.2.windows.1
> 
> 
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