linux-kernel - Re: [PATCH] ixgbe: take online CPU number as MQ max limit when alloc_etherdev

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Message-ID: <57395CED.1090200@oracle.com>
Date:	Mon, 16 May 2016 13:38:53 +0800
From:	ethan zhao <ethan.zhao@...cle.com>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	jeffrey.t.kirsher@...el.com, jesse.brandeburg@...el.com,
	shannon.nelson@...el.com, carolyn.wyborny@...el.com,
	donald.c.skidmore@...el.com, bruce.w.allan@...el.com,
	john.ronciak@...el.com, mitch.a.williams@...el.com,
	intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, ethan.kernel@...il.com
Subject: Re: [PATCH] ixgbe: take online CPU number as MQ max limit when
 alloc_etherdev_mq()

Thanks for your reviewing.

Ethan

On 2016/5/13 20:52, Sergei Shtylyov wrote:
> Hello.
>
> On 5/13/2016 8:56 AM, Ethan Zhao wrote:
>
>> Allocating 64 Tx/Rx as default doesn't benefit perfomrnace when less
>
>    Performance.
>
>> CPUs were assigned. especially when DCB is enabled, so we should take
>> num_online_cpus() as top limit, and aslo to make sure every TC has
>
>    Also.
>
>> at least one queue, take the MAX_TRAFFIC_CLASS as bottom limit of queues
>> number.
>>
>> Signed-off-by: Ethan Zhao <ethan.zhao@...cle.com>
>> ---
>>  drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 4 ++++
>>  1 file changed, 4 insertions(+)
>>
>> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c 
>> b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
>> index 7df3fe2..1f9769c 100644
>> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
>> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
>> @@ -9105,6 +9105,10 @@ static int ixgbe_probe(struct pci_dev *pdev, 
>> const struct pci_device_id *ent)
>>          indices = IXGBE_MAX_RSS_INDICES;
>>  #endif
>>      }
>> +    /* Don't allocate too more queues than online cpus number */
>
>    "Too" not needed here. CPUs.
>
>> +    indices = min_t(int, indices, num_online_cpus());
>> +    /* To make sure TC works, allocate at least 1 queue per TC */
>> +    indices = max_t(int, indices, MAX_TRAFFIC_CLASS);
>>
>>      netdev = alloc_etherdev_mq(sizeof(struct ixgbe_adapter), indices);
>>      if (!netdev) {
>
> MBR, Sergei
>
>