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 smtp4.osuosl.org (smtp4.osuosl.org [140.211.166.137]) (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 72D72C64ED8 for ; Tue, 7 Feb 2023 21:32:15 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp4.osuosl.org (Postfix) with ESMTP id DCEE94171E; Tue, 7 Feb 2023 21:32:14 +0000 (UTC) DKIM-Filter: OpenDKIM Filter v2.11.0 smtp4.osuosl.org DCEE94171E Authentication-Results: smtp4.osuosl.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=Jl8a+4Mz X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp4.osuosl.org ([127.0.0.1]) by localhost (smtp4.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 0GZGXL6m0J27; Tue, 7 Feb 2023 21:32:13 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by smtp4.osuosl.org (Postfix) with ESMTPS id 2BF86416ED; Tue, 7 Feb 2023 21:32:13 +0000 (UTC) DKIM-Filter: OpenDKIM Filter v2.11.0 smtp4.osuosl.org 2BF86416ED Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 05098C0033; Tue, 7 Feb 2023 21:32:13 +0000 (UTC) Received: from smtp3.osuosl.org (smtp3.osuosl.org [140.211.166.136]) by lists.linuxfoundation.org (Postfix) with ESMTP id 80314C002B for ; Tue, 7 Feb 2023 21:32:11 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp3.osuosl.org (Postfix) with ESMTP id 5AA5D61044 for ; Tue, 7 Feb 2023 21:32:11 +0000 (UTC) DKIM-Filter: OpenDKIM Filter v2.11.0 smtp3.osuosl.org 5AA5D61044 Authentication-Results: smtp3.osuosl.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=Jl8a+4Mz X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp3.osuosl.org ([127.0.0.1]) by localhost (smtp3.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id jgMX6Ro6IkEc for ; Tue, 7 Feb 2023 21:32:10 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.8.0 DKIM-Filter: OpenDKIM Filter v2.11.0 smtp3.osuosl.org 4C17761042 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by smtp3.osuosl.org (Postfix) with ESMTPS id 4C17761042 for ; Tue, 7 Feb 2023 21:32:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1675805528; 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: in-reply-to:in-reply-to:references:references; bh=k3k1fen54zftZrOy46HBwu2Sbu6PqY4Tuz4A1LMJQ5g=; b=Jl8a+4Mzn7fWroTFm5q+q+Y6vUcN44dM9jqJONxd5sap1p537xo05C5B4zfFp5yFkIlArr ObNV7rAV1aYP1e2X+zt8rJeKZEWha6lLEiiNiGTwUusmMTKIVGVhU2+Tms60bMsvR3JRw8 lrqSzksV9AeUeemF+q7FKDtirZJ/ejo= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-339-vgrehFlGMeezwvXT_aOPMw-1; Tue, 07 Feb 2023 16:32:06 -0500 X-MC-Unique: vgrehFlGMeezwvXT_aOPMw-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.rdu2.redhat.com [10.11.54.2]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id C98331C426A0; Tue, 7 Feb 2023 21:32:05 +0000 (UTC) Received: from localhost (unknown [10.39.192.15]) by smtp.corp.redhat.com (Postfix) with ESMTP id 8ACB040398A0; Tue, 7 Feb 2023 21:32:04 +0000 (UTC) Date: Tue, 7 Feb 2023 16:32:02 -0500 From: Stefan Hajnoczi To: Vivek Goyal Subject: Re: virtio-fs: adding support for multi-queue Message-ID: References: <2fd99bc2-0414-0b85-2bff-3a84ae6c23bd@gootzen.net> MIME-Version: 1.0 In-Reply-To: X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 Cc: German Maglione , virtualization@lists.linux-foundation.org, Jonas Pfefferle , miklos@szeredi.hu X-BeenThere: virtualization@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Linux virtualization List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============8954147259806209082==" Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" --===============8954147259806209082== Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="faGnl+fV3hCw5ZpB" Content-Disposition: inline --faGnl+fV3hCw5ZpB Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Feb 07, 2023 at 02:53:58PM -0500, Vivek Goyal wrote: > On Tue, Feb 07, 2023 at 02:45:39PM -0500, Stefan Hajnoczi wrote: > > On Tue, Feb 07, 2023 at 11:14:46AM +0100, Peter-Jan Gootzen wrote: > > > Hi, > > >=20 >=20 > [cc German] >=20 > > > For my MSc thesis project in collaboration with IBM > > > (https://github.com/IBM/dpu-virtio-fs) we are looking to improve the > > > performance of the virtio-fs driver in high throughput scenarios. We = think > > > the main bottleneck is the fact that the virtio-fs driver does not su= pport > > > multi-queue (while the spec does). A big factor in this is that our s= etup on > > > the virtio-fs device-side (a DPU) does not easily allow multiple core= s to > > > tend to a single virtio queue. >=20 > This is an interesting limitation in DPU. Virtqueues are single-consumer queues anyway. Sharing them between multiple threads would be expensive. I think using multiqueue is natural and not specific to DPUs. Stefan --faGnl+fV3hCw5ZpB Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEhpWov9P5fNqsNXdanKSrs4Grc8gFAmPiw1IACgkQnKSrs4Gr c8jy5Af+POLyRhJ/CiB2V3bUQsWchUrS15jIxidYhrtze6LlG0ZQcxPPCAynNIH/ lM7MYVZgJFt8Au1lNUTQRRxjYKJRrmdgvmCGoEv40Yd+OXsD7QkzFOG5KakETAgf 6TWqVI0OwEQSfke85heuMqrnBs+Q7asI1leOREv8xsdjccfS0XxUfi9j6+p7ZICN 2kRN0VeHmiC3Zf9mjAx9WB4jfA3QrzRVcr0uvlU/X6zM+EgtTHNVlWq8Ch/qH5Nk AWCFvZ6spMZNEaskN6lS7DmUhghJ0P47jQGYkNOtYP7tdGeZzKFAsk8TVH6NXQfg J3u7uCf231qVaEAVq9VXwnP3SvM8Sw== =aWYG -----END PGP SIGNATURE----- --faGnl+fV3hCw5ZpB-- --===============8954147259806209082== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization --===============8954147259806209082==--