From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7014FC433EF for ; Thu, 17 Mar 2022 02:20:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238405AbiCQCVg (ORCPT ); Wed, 16 Mar 2022 22:21:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39240 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233729AbiCQCVf (ORCPT ); Wed, 16 Mar 2022 22:21:35 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 71ECD1BE92 for ; Wed, 16 Mar 2022 19:20:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1647483619; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=nPCfzxyjMhxLP4qSRwQ+hURc5goubZq4R+xZPtQNplE=; b=FZh+BFUO7Y9ZW6k1zK66mexuOBvAvp8u5RtYhqLoIK+dmTm8rraxj/QdjA6OLGlwBNE5qJ kv0DBo6XlO6dlM8W+WEfcq7YzLSBI1VgblRFkhuc3jHy8+ux4RZ7xhv4cDeIcY8cW9+nF5 0GvrynipnkP1OxvGPGZobaw3nT+XwJg= Received: from mail-lj1-f200.google.com (mail-lj1-f200.google.com [209.85.208.200]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-146-JBTwAllqNUu2MAteK9q4sw-1; Wed, 16 Mar 2022 22:20:18 -0400 X-MC-Unique: JBTwAllqNUu2MAteK9q4sw-1 Received: by mail-lj1-f200.google.com with SMTP id 185-20020a2e05c2000000b002463aff775aso1551739ljf.17 for ; Wed, 16 Mar 2022 19:20:17 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=nPCfzxyjMhxLP4qSRwQ+hURc5goubZq4R+xZPtQNplE=; b=M0mJjjSCAYjq/NMlNVK6tnt5ibX0psAj96vVQct63KrFY2TVtjAWaYWirPFfkj5uiW gYfxKA3XAy+PCJ9oy2oUYZjQjF/5jSW7mWRL1d8vpJ1Q+jGVMi2dGa7k4jloqCc7626o dbPxj/IcJMrp7+2xY/G+83W4cw8sE3IKf6gIgqTKbcDZuL5Uwx3CJNMMu2xk/1Bx5j/c DN3C71Ulb7rB8BA0WyUKbi3G2YJSqzTfrJahSEebykZFbCRf/eqo3/GdCAK98u5U4Mcz CCYgK+EGIZtz2rKrXRzsFg4lpHP7DchqqZYhMPqpRRyocpQcYRJ8kV1LL70DRwsK0R++ k9eQ== X-Gm-Message-State: AOAM532sSsOjVpFZgfm0iA+Jt9t3DmAApOmKhIVS4TXcijBnWGUVd8Ha +iUd7YafZ2AiQdPBQjJ6jXCNbBX12R+0noBK1pA0Qy/8GQQ+oWe7Dx2xLSXNNpNZfarfPNEqBYc AX6KC6ocPYYXZkm5qImGcXdAYroTf0cv99GLksUI= X-Received: by 2002:a05:651c:b23:b0:247:ee17:e9ed with SMTP id b35-20020a05651c0b2300b00247ee17e9edmr1466185ljr.243.1647483616418; Wed, 16 Mar 2022 19:20:16 -0700 (PDT) X-Google-Smtp-Source: ABdhPJxBCg7wlhjy6Rcdi31sE5bb7ELPAmbhPDTsbU5Jc7PjWTT/34HozDuP3hNEXZTNkG2RGvy9B9CMVr5KB2Cun9k= X-Received: by 2002:a05:651c:b23:b0:247:ee17:e9ed with SMTP id b35-20020a05651c0b2300b00247ee17e9edmr1466175ljr.243.1647483616214; Wed, 16 Mar 2022 19:20:16 -0700 (PDT) MIME-Version: 1.0 References: <20220311152832.17703-1-suwan.kim027@gmail.com> In-Reply-To: From: Jason Wang Date: Thu, 17 Mar 2022 10:20:05 +0800 Message-ID: Subject: Re: [PATCH] virtio-blk: support polling I/O To: Suwan Kim Cc: mst , pbonzini , Stefan Hajnoczi , virtualization , linux-block@vger.kernel.org, Max Gurtovoy Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org On Wed, Mar 16, 2022 at 11:33 PM Suwan Kim wrote: > > On Wed, Mar 16, 2022 at 10:02:13AM +0800, Jason Wang wrote: > > On Tue, Mar 15, 2022 at 10:43 PM Suwan Kim wro= te: > > > > > > On Tue, Mar 15, 2022 at 04:59:23PM +0800, Jason Wang wrote: > > > > On Mon, Mar 14, 2022 at 8:33 PM Suwan Kim = wrote: > > > > > > > > > On Mon, Mar 14, 2022 at 02:14:53PM +0800, Jason Wang wrote: > > > > > > > > > > > > =E5=9C=A8 2022/3/11 =E4=B8=8B=E5=8D=8811:28, Suwan Kim =E5=86= =99=E9=81=93: > > > > > > > diff --git a/include/uapi/linux/virtio_blk.h > > > > > b/include/uapi/linux/virtio_blk.h > > > > > > > index d888f013d9ff..3fcaf937afe1 100644 > > > > > > > --- a/include/uapi/linux/virtio_blk.h > > > > > > > +++ b/include/uapi/linux/virtio_blk.h > > > > > > > @@ -119,8 +119,9 @@ struct virtio_blk_config { > > > > > > > * deallocation of one or more of the sectors. > > > > > > > */ > > > > > > > __u8 write_zeroes_may_unmap; > > > > > > > + __u8 unused1; > > > > > > > - __u8 unused1[3]; > > > > > > > + __virtio16 num_poll_queues; > > > > > > > } __attribute__((packed)); > > > > > > > > > > > > > > > > > > This looks like a implementation specific (virtio-blk-pci) opti= mization, > > > > > how > > > > > > about other implementation like vhost-user-blk? > > > > > > > > > > I didn=E2=80=99t consider vhost-user-blk yet. But does vhost-user= -blk also > > > > > use vritio_blk_config as kernel-qemu interface? > > > > > > > > > > > > > Yes, but see below. > > > > > > > > > > > > > > > > > > Does vhost-user-blk need additional modification to support polli= ng > > > > > in kernel side? > > > > > > > > > > > > > > > > > No, but the issue is, things like polling looks not a good candidat= e for > > > > the attributes belonging to the device but the driver. So I have mo= re > > > > questions: > > > > > > > > 1) what does it really mean for hardware virtio block devices? > > > > 2) Does driver polling help for the qemu implementation without pol= ling? > > > > 3) Using blk_config means we can only get the benefit from the new = device > > > > > > 1) what does it really mean for hardware virtio block devices? > > > 3) Using blk_config means we can only get the benefit from the new de= vice > > > > > > This patch adds dedicated HW queue for polling purpose to virtio > > > block device. > > > > > > So I think it can be a new hw feature. And it can be a new device > > > that supports hw poll queue. > > > > One possible issue is that the "poll" looks more like a > > software/driver concept other than the device/hardware. > > > > > > > > BTW, I have other idea about it. > > > > > > How about adding =E2=80=9Cnum-poll-queues" property as a driver param= eter > > > like NVMe driver, not to QEMU virtio-blk-pci property? > > > > It should be fine, but we need to listen to others. > > To Michael, Stefan, Max > > How about using driver parameter instead of virio_blk_config? I agree. Thanks > > Regards, > Suwan Kim > From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from smtp2.osuosl.org (smtp2.osuosl.org [140.211.166.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 6E597C433F5 for ; Thu, 17 Mar 2022 02:20:24 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp2.osuosl.org (Postfix) with ESMTP id E500C40AEA; Thu, 17 Mar 2022 02:20:23 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp2.osuosl.org ([127.0.0.1]) by localhost (smtp2.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id HwNUzdIvOz5J; Thu, 17 Mar 2022 02:20:22 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by smtp2.osuosl.org (Postfix) with ESMTPS id 4EDB340111; Thu, 17 Mar 2022 02:20:22 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