From: "Roger Pau Monné" <roger.pau@citrix.com>
To: Bob Liu <bob.liu@oracle.com>
Cc: <xen-devel@lists.xen.org>, <david.vrabel@citrix.com>,
<linux-kernel@vger.kernel.org>, <konrad.wilk@oracle.com>,
<felipe.franciosi@citrix.com>, <axboe@fb.com>,
<hch@infradead.org>, <avanzini.arianna@gmail.com>,
<rafal.mielniczuk@citrix.com>, <boris.ostrovsky@oracle.com>,
<jonathan.davies@citrix.com>
Subject: Re: [PATCH v3 6/9] xen/blkfront: negotiate the number of hw queues/rings with backend
Date: Wed, 7 Oct 2015 13:46:13 +0200 [thread overview]
Message-ID: <56150605.2090003@citrix.com> (raw)
In-Reply-To: <5614F67C.3060003@oracle.com>
El 07/10/15 a les 12.39, Bob Liu ha escrit:
> On 10/05/2015 10:40 PM, Roger Pau Monné wrote:
>> El 05/09/15 a les 14.39, Bob Liu ha escrit:
>>> @@ -2267,6 +2335,12 @@ static int __init xlblk_init(void)
>>> xen_blkif_max_ring_order = 0;
>>> }
>>>
>>> + if (xen_blkif_max_queues > nr_cpus) {
>>
>> Shouldn't there be a default value for xen_blkif_max_queues if the user
>> hasn't set the parameter on the command line?
>>
>
> Then the default value is 0, multi-queue isn't enabled by default.
Why isn't it enabled by default with a sensible number of queues? I
guess something like:
if (xen_blkif_max_queues == 0)
xen_blkif_max_queues = min(nr_cpus, 4);
Roger.
next prev parent reply other threads:[~2015-10-07 11:46 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-05 12:39 [PATCH v3 0/9] xen-block: support multi hardware-queues/rings Bob Liu
2015-09-05 12:39 ` [PATCH v3 1/9] xen-blkfront: convert to blk-mq APIs Bob Liu
2015-09-23 20:31 ` Konrad Rzeszutek Wilk
2015-09-23 21:12 ` Konrad Rzeszutek Wilk
2015-09-05 12:39 ` [PATCH v3 2/9] xen-block: add document for mutli hardware queues/rings Bob Liu
2015-09-23 20:32 ` Konrad Rzeszutek Wilk
2015-10-02 16:04 ` Roger Pau Monné
2015-10-02 16:12 ` [Xen-devel] " Wei Liu
2015-10-02 16:22 ` Roger Pau Monné
2015-10-02 23:55 ` Bob Liu
2015-09-05 12:39 ` [PATCH v3 3/9] xen/blkfront: separate per ring information out of device info Bob Liu
2015-10-02 17:02 ` Roger Pau Monné
2015-10-03 0:34 ` Bob Liu
2015-10-05 15:17 ` Roger Pau Monné
2015-10-10 8:30 ` Bob Liu
2015-10-19 9:42 ` Roger Pau Monné
2015-09-05 12:39 ` [PATCH v3 4/9] xen/blkfront: pseudo support for multi hardware queues/rings Bob Liu
2015-10-05 10:52 ` Roger Pau Monné
2015-10-07 10:28 ` Bob Liu
2015-09-05 12:39 ` [PATCH v3 5/9] xen/blkfront: convert per device io_lock to per ring ring_lock Bob Liu
2015-10-05 14:13 ` Roger Pau Monné
2015-10-07 10:34 ` Bob Liu
2015-09-05 12:39 ` [PATCH v3 6/9] xen/blkfront: negotiate the number of hw queues/rings with backend Bob Liu
2015-10-05 14:40 ` Roger Pau Monné
2015-10-07 10:39 ` Bob Liu
2015-10-07 11:46 ` Roger Pau Monné [this message]
2015-10-07 12:19 ` Bob Liu
2015-09-05 12:39 ` [PATCH v3 7/9] xen/blkback: separate ring information out of struct xen_blkif Bob Liu
2015-10-05 14:55 ` Roger Pau Monné
2015-10-07 10:41 ` Bob Liu
2015-10-10 4:08 ` Bob Liu
2015-10-19 9:36 ` Roger Pau Monné
2015-10-19 10:03 ` Bob Liu
2015-10-05 14:55 ` Roger Pau Monné
2015-09-05 12:39 ` [PATCH v3 8/9] xen/blkback: pseudo support for multi hardware queues/rings Bob Liu
2015-10-05 15:08 ` Roger Pau Monné
2015-10-07 10:50 ` Bob Liu
2015-10-07 11:49 ` Roger Pau Monné
2015-09-05 12:39 ` [PATCH v3 9/9] xen/blkback: get number of hardware queues/rings from blkfront Bob Liu
2015-10-05 15:15 ` Roger Pau Monné
2015-10-07 10:54 ` Bob Liu
2015-10-02 9:57 ` [PATCH v3 0/9] xen-block: support multi hardware-queues/rings Rafal Mielniczuk
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