From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id BE1CBA3267 for ; Mon, 21 Oct 2019 17:24:34 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 0CF0D1BF13; Mon, 21 Oct 2019 17:24:33 +0200 (CEST) Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by dpdk.org (Postfix) with ESMTP id A758F1BEF0 for ; Mon, 21 Oct 2019 17:24:30 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga002.jf.intel.com ([10.7.209.21]) by fmsmga103.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 21 Oct 2019 08:24:29 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.67,324,1566889200"; d="scan'208";a="209372753" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.10]) ([10.237.221.10]) by orsmga002.jf.intel.com with ESMTP; 21 Oct 2019 08:24:27 -0700 To: Bruce Richardson , "Loftus, Ciara" Cc: Stephen Hemminger , "dev@dpdk.org" , "Ye, Xiaolong" , "Laatz, Kevin" , arybchenko@solarflare.com References: <20190930164205.19419-1-ciara.loftus@intel.com> <20190930164205.19419-3-ciara.loftus@intel.com> <20190930101137.4919f93e@hermes.lan> <74F120C019F4A64C9B78E802F6AD4CC279226C6C@IRSMSX106.ger.corp.intel.com> <20191014144308.GA1394@bricha3-MOBL.ger.corp.intel.com> From: Ferruh Yigit Openpgp: preference=signencrypt Autocrypt: addr=ferruh.yigit@intel.com; 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charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Subject: Re: [dpdk-dev] [PATCH v2 2/3] net/af_xdp: support pinning of IRQs X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" On 10/14/2019 3:43 PM, Bruce Richardson wrote: > On Thu, Oct 03, 2019 at 02:23:07PM +0100, Loftus, Ciara wrote: >> >> >>> -----Original Message----- From: Stephen Hemminger >>> Sent: Monday 30 September 2019 18:12 To: >>> Loftus, Ciara Cc: dev@dpdk.org; Ye, Xiaolong >>> ; Laatz, Kevin ; >>> Richardson, Bruce Subject: Re: [dpdk-dev] >>> [PATCH v2 2/3] net/af_xdp: support pinning of IRQs >>> >>> On Mon, 30 Sep 2019 16:42:04 +0000 Ciara Loftus >>> wrote: >>> >>>> +/* drivers supported for the queue_irq option */ +enum >>>> supported_drivers { + I40E_DRIVER, + IXGBE_DRIVER, + >>>> MLX5_DRIVER, + NUM_DRIVERS +}; >>> >>> Anything device specific like this raises a red flag to me. >>> >>> This regex etc, seems like a huge hack. Is there a better way using >>> irqbalance and smp_affinity in kernel drivers? >>> >>> NACK >> >> Hi Stephen, >> >> Thanks for looking at the patch. I understand your concern however >> unfortunately I haven't been able to identify a way to achieve the >> desired outcome by using your suggestions of irqbalance and smp_affinity. >> Did you have something specific in mind or are aware of any generic way >> of retrieving interrupt numbers for NICs regardless of vendor or range? >> >> I think this feature is really important for the usability of this PMD. >> Without it, to configure the IRQs the user has to open up >> /proc/interrupts, trawl through it and identify the correct IRQ number >> for their given NIC and qid (the format for which is unlikely to be known >> off-hand), and manually pin them by writing the appropriate values in the >> appropriate format to the appropriate file - prone to error if not >> automated IMO. If the user fails to set the affinity it's probably fine >> for a single pmd, however with multiple pmds all irqs will by default >> land on core 0 and lead to terrible performance. >> >> It should be possible to rework the code to remove the regexes and use a >> direct string compare. Would that make the solution more palatable? >> > > Hi Ciara, Stephen, > > is there any way forward on this patch? > > From my experience with using AF_XDP the pinning of interrupts is both > necessary for performance and sadly rather awkward to implement in > practice. If we can't find a better way to do this, I think merging this > patch is the best thing to do. It may be a bit messy, but the overall user > experience should be far improved over not having it. > Can we have this external to the PMD, like a helper script that run after you start the DPDK app?