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Re: [Qemu-block] [Qemu-devel] [PATCH 1/2] virtio-blk: make queue size co

From: Stefan Hajnoczi
Subject: Re: [Qemu-block] [Qemu-devel] [PATCH 1/2] virtio-blk: make queue size configurable
Date: Fri, 8 Dec 2017 10:13:25 +0000
User-agent: Mutt/1.9.1 (2017-09-22)

On Wed, Dec 06, 2017 at 01:54:00PM -0600, Mark Kanda wrote:
> Depending on the configuration, it can be beneficial to adjust the virtio-blk
> queue size to something other than the current default of 128. Add a new
> property to make the queue size configurable.
> Signed-off-by: Mark Kanda <address@hidden>
> Reviewed-by: Karl Heubaum <address@hidden>
> Reviewed-by: Martin K. Petersen <address@hidden>
> Reviewed-by: Ameya More <address@hidden>
> ---
>  hw/block/virtio-blk.c          | 7 ++++++-
>  include/hw/virtio/virtio-blk.h | 1 +
>  2 files changed, 7 insertions(+), 1 deletion(-)

Please see commit 9b02e1618cf26aa52cf786f215d757506dda14f8 ("virtio-net:
enable configurable tx queue size") for additional considerations.
QEMU's virtio implementation hardcodes the maximum queue size at 1024
and this limit must be checked.

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