From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jens Axboe Subject: Re: [LSF/MM TOPIC][LSF/MM ATTEND] NAPI polling for block drivers Date: Wed, 11 Jan 2017 08:13:02 -0700 Message-ID: References: <20170111134312.GH6286@linux-x5ow.site> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Return-path: Received: from mail-io0-f174.google.com ([209.85.223.174]:35826 "EHLO mail-io0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1762274AbdAKPNF (ORCPT ); Wed, 11 Jan 2017 10:13:05 -0500 Received: by mail-io0-f174.google.com with SMTP id j18so85312635ioe.2 for ; Wed, 11 Jan 2017 07:13:04 -0800 (PST) In-Reply-To: Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: Johannes Thumshirn , "lsf-pc@lists.linux-foundation.org" Cc: linux-block@vger.kernel.org, Linux-scsi@vger.kernel.org, Sagi Grimberg , linux-nvme@lists.infradead.org, Christoph Hellwig , Keith Busch On 01/11/2017 08:07 AM, Jens Axboe wrote: > On 01/11/2017 06:43 AM, Johannes Thumshirn wrote: >> Hi all, >> >> I'd like to attend LSF/MM and would like to discuss polling for block drivers. >> >> Currently there is blk-iopoll but it is neither as widely used as NAPI in the >> networking field and accoring to Sagi's findings in [1] performance with >> polling is not on par with IRQ usage. >> >> On LSF/MM I'd like to whether it is desirable to have NAPI like polling in >> more block drivers and how to overcome the currently seen performance issues. > > It would be an interesting topic to discuss, as it is a shame that blk-iopoll > isn't used more widely. Forgot to mention - it should only be a topic, if experimentation has been done and results gathered to pin point what the issues are, so we have something concrete to discus. I'm not at all interested in a hand wavy discussion on the topic. -- Jens Axboe