linux-kernel - Re: [PATCH] virtio-blk: make the queue depth configurable

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Message-ID: <1394818720.3253.1.camel@joe-AO722>
Date:	Fri, 14 Mar 2014 10:38:40 -0700
From:	Joe Perches <joe@...ches.com>
To:	Theodore Ts'o <tytso@....edu>
Cc:	Linux Kernel Developers List <linux-kernel@...r.kernel.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	virtio-dev@...ts.oasis-open.org,
	virtualization@...ts.linux-foundation.org, fes@...gle.com
Subject: Re: [PATCH] virtio-blk: make the queue depth configurable

On Fri, 2014-03-14 at 13:31 -0400, Theodore Ts'o wrote:
> The current virtio block sets a queue depth of 64.  With a
> sufficiently fast device, using a queue depth of 256 can double the
> IOPS which can be sustained.  So make the queue depth something which
> can be set at module load time or via a kernel boot-time parameter.
[]
> diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
[]
> @@ -481,6 +481,9 @@ static struct blk_mq_ops virtio_mq_ops = {
>  	.free_hctx	= blk_mq_free_single_hw_queue,
>  };
>  
> +static int queue_depth = 64;
> +module_param(queue_depth, int, 444);

444?  Really Ted?

0444



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