[win-pv-devel] [PATCH 0/4] Use StorPort queues

[<owen.smith@xxxxxxxxxx>]

From: Owen Smith <owen.smith@xxxxxxxxxx>

Maintaining a queue of SRBs inside xenvbd is not ideal, as its possible
(though rare) for SRBs to time out while in the fresh queue.
These patches moves the blkif_request preparation and an attempt to
submit all prepared requests code to the StartIo call. Requests that cannot
be prepared (e.g. due to limited resources) are returned to StorPort with
SRB_STATUS_BUSY, which will reinsert the SRB into StorPorts queues.
This reorganization reduces the amount of work required in the DPC routine.

An exploratory WHQL test passed using Windows10 (x64) 1709
IOMeter results (backed by local spinning disk) showed some small improvments
across all scenarios

Owen Smith (4):
  Rationalize WasQueued semantics
  Pass SrbExt to RingPrepare* calls
  Remove FreshSrbs queue
  Abort any partially completed SRBs

 src/xenvbd/ring.c   | 144 ++++++++++++++++------------------------------------
 src/xenvbd/ring.h   |   2 +-
 src/xenvbd/target.c |  28 ++++------
 3 files changed, 55 insertions(+), 119 deletions(-)

-- 
2.8.3


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