[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Xen-devel] [PATCH v3 6/9] xen/blkfront: negotiate the number of hw queues/rings with backend



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.

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel


 


Rackspace

Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.