From: "Xu, Qian Q" <qian.q.xu@intel.com>
To: Thomas Monjalon <thomas.monjalon@6wind.com>,
"Zhang, Helin" <helin.zhang@intel.com>,
"Wu, Jingjing" <jingjing.wu@intel.com>
Cc: "Mcnamara, John" <john.mcnamara@intel.com>,
"dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] i40e queues per VF
Date: Thu, 16 Feb 2017 10:03:46 +0000 [thread overview]
Message-ID: <82F45D86ADE5454A95A89742C8D1410E3B51BCCA@shsmsx102.ccr.corp.intel.com> (raw)
In-Reply-To: <32336171.7h5g7kEJXa@xps13>
Helin/Jingjing
Could you give some answers here? Thx.
> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Thomas Monjalon
> Sent: Tuesday, February 14, 2017 6:07 PM
> To: Zhang, Helin <helin.zhang@intel.com>; Wu, Jingjing <jingjing.wu@intel.com>
> Cc: Mcnamara, John <john.mcnamara@intel.com>; dev@dpdk.org
> Subject: [dpdk-dev] i40e queues per VF
>
> Hi,
>
> When reading the documentation, it is not easy to understand the capability of
> i40evf for the number of queues.
>
> First, please could you explain why we need a build-time config option?
> In the doc, there is neither justification nor tuning guidelines:
>
> http://dpdk.org/doc/guides/nics/i40e.html#config-file-options
> "
> CONFIG_RTE_LIBRTE_I40E_QUEUE_NUM_PER_PF (default 64) Number of
> queues reserved for PF.
> CONFIG_RTE_LIBRTE_I40E_QUEUE_NUM_PER_VF (default 4) Number of
> queues reserved for each SR-IOV VF.
> "
>
> I feel these are hard limits and should be some constants in the code, not some
> build configuration options.
>
> The other doc to look at is:
> http://dpdk.org/doc/guides/nics/intel_vf.html#intel-fortville-10-40-gigabit-
> ethernet-controller-vf-infrastructure
> "
> Each VF can have a maximum of 16 queue pairs.
> "
>
> Do we agree that a queue pair is 1 Rx queue / 1 Tx queue?
> Note: the concept of queue pairs in Intel VF should be explained somewhere.
>
> Below, a different limitation is given:
> "
> The available queue number(at most 4) per VF depends on the total number of
> pool, which is determined by the max number of VF at PF initialization stage and
> the number of queue specified in config "
>
> So what is the real maximum of queue pairs? 4 or 16?
> The datasheet talks about 16 queues. Is it 8 pairs?
>
> Is there something to configure the number of queues when creating VF with the
> kernel driver?
next prev parent reply other threads:[~2017-02-16 10:03 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-14 10:07 Thomas Monjalon
2017-02-16 10:03 ` Xu, Qian Q [this message]
2017-02-16 13:58 ` Wu, Jingjing
2017-02-16 14:55 ` Thomas Monjalon
2017-03-08 11:25 ` Thomas Monjalon
2017-03-14 9:31 ` Thomas Monjalon
2017-03-21 6:01 ` Wu, Jingjing
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