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 X-Spam-Level: X-Spam-Status: No, score=-7.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_2 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C3C1AC11F66 for ; Tue, 29 Jun 2021 10:49:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A17B761D90 for ; Tue, 29 Jun 2021 10:49:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233269AbhF2KwO (ORCPT ); Tue, 29 Jun 2021 06:52:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52892 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231956AbhF2KwM (ORCPT ); Tue, 29 Jun 2021 06:52:12 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8CFEBC061574 for ; Tue, 29 Jun 2021 03:49:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Mime-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=F1o5kVEcyU3k1dWF9D+Vk0sPJTSArQIXoIQEv1zJn1U=; b=Zr8y8IadsiIdIYUkaE9IPC/gRF 1YB1uZHxvoV3t8km1dvYiQ5VZm0KvrqIi8mDFuV/rXpQTgobCgJV+AabXlKZnOknQB2VaSNJiYLY1 cGQQWwmrCBRD9wz5D5VRdw5vdup/WJ2/WzlnQWMYzxoU/17efM5q7ywcz3mr1qBbxC6Kh+spyTzUH 4ZvYQL6WPj7XCLKvQP6nOt4TvP3KaaQv8bsKSnVzCILF3qYJJOPA2pMHdvJLo6rf+soM3AgutpwCI htWqGxIsXZ8m7ZlIq1FXJwvrIH1wf2dh1Y6dgcT4hGmQBPKmZb6VUiEQiAZ2dYX7AIcld528ITd+8 M0z0EUMw==; Received: from dyn-239.woodhou.se ([90.155.92.239] helo=u3832b3a9db3152.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1lyBJG-00Aa6c-Ph; Tue, 29 Jun 2021 10:49:45 +0000 Message-ID: Subject: Re: [PATCH v3 3/5] vhost_net: remove virtio_net_hdr validation, let tun/tap do it themselves From: David Woodhouse To: Jason Wang , netdev@vger.kernel.org Cc: Eugenio =?ISO-8859-1?Q?P=E9rez?= , Willem de Bruijn , "Michael S.Tsirkin" Date: Tue, 29 Jun 2021 11:49:40 +0100 In-Reply-To: <99496947-8171-d252-66d3-0af12c62fd2c@redhat.com> References: <03ee62602dd7b7101f78e0802249a6e2e4c10b7f.camel@infradead.org> <20210624123005.1301761-1-dwmw2@infradead.org> <20210624123005.1301761-3-dwmw2@infradead.org> <1c6110d9-2a45-f766-9d9a-e2996c14b748@redhat.com> <72dfecd426d183615c0dd4c2e68690b0e95dd739.camel@infradead.org> <80f61c54a2b39cb129e8606f843f7ace605d67e0.camel@infradead.org> <99496947-8171-d252-66d3-0af12c62fd2c@redhat.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-VqN/1+WVeM/eP6R6qlqi" X-Mailer: Evolution 3.28.5-0ubuntu0.18.04.2 Mime-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org --=-VqN/1+WVeM/eP6R6qlqi Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2021-06-29 at 11:43 +0800, Jason Wang wrote: > > The kernel on a c5.metal can transmit (AES128-SHA1) ESP at about > > 1.2Gb/s from iperf, as it seems to be doing it all from the iperf > > thread. > >=20 > > Before I started messing with OpenConnect, it could transmit 1.6Gb/s. > >=20 > > When I pull in the 'stitched' AES+SHA code from OpenSSL instead of > > doing the encryption and the HMAC in separate passes, I get to 2.1Gb/s. > >=20 > > Adding vhost support on top of that takes me to 2.46Gb/s, which is a > > decent enough win. >=20 >=20 > Interesting, I think the latency should be improved as well in this > case. I tried using 'ping -i 0.1' to get an idea of latency for the interesting VoIP-like case of packets where we have to wake up each time. For the *inbound* case, RX on the tun device followed by TX of the replies, I see results like this: --- 172.16.0.2 ping statistics --- 141 packets transmitted, 141 received, 0% packet loss, time 14557ms rtt min/avg/max/mdev =3D 0.380/0.419/0.461/0.024 ms The opposite direction (tun TX then RX) is similar: --- 172.16.0.1 ping statistics --- 295 packets transmitted, 295 received, 0% packet loss, time 30573ms rtt min/avg/max/mdev =3D 0.454/0.545/0.718/0.024 ms Using vhost-net (and TUNSNDBUF of INT_MAX-1 just to avoid XDP), it looks like this. Inbound: --- 172.16.0.2 ping statistics --- 139 packets transmitted, 139 received, 0% packet loss, time 14350ms rtt min/avg/max/mdev =3D 0.432/0.578/0.658/0.058 ms Outbound: --- 172.16.0.1 ping statistics --- 149 packets transmitted, 149 received, 0% packet loss, time 15391ms rtt mn/avg/max/mdev =3D 0.496/0.682/0.935/0.036 ms So as I expected, the throughput is better with vhost-net once I get to the point of 100% CPU usage in my main thread, because it offloads the kernel=E2=86=90=E2=86=92user copies. But latency is somewhat worse. I'm still using select() instead of epoll() which would give me a little back =E2=80=94 but only a little, as I only poll on 3-4 fds, and mor= e to the point it'll give me just as much win in the non-vhost case too, so it won't make much difference to the vhost vs. non-vhost comparison. Perhaps I really should look into that trick of "if the vhost TX ring is already stopped and would need a kick, and I only have a few packets in the batch, just write them directly to /dev/net/tun". I'm wondering how that optimisation would translate to actual guests, which presumably have the same problem. Perhaps it would be an operation on the vhost fd, which ends up processing the ring right there in the context of *that* process instead of doing a wakeup? FWIW if I pull in my kernel patches and stop working around those bugs, enabling the TX XDP path and dropping the virtio-net header that I don't need, I get some of that latency back: --- 172.16.0.2 ping statistics --- 151 packets transmitted, 151 received, 0% packet loss, time 15599ms rtt min/avg/max/mdev =3D 0.372/0.550/0.661/0.061 ms --- 172.16.0.1 ping statistics --- 214 packets transmitted, 214 received, 0% packet loss, time 22151ms rtt min/avg/max/mdev =3D 0.453/0.626/0.765/0.049 ms My bandwidth tests go up from 2.46Gb/s with the workarounds, to 2.50Gb/s once I enable XDP, and 2.52Gb/s when I drop the virtio-net header. But there's no way for userspace to *detect* that those bugs are fixed, which makes it hard to ship that version. --=-VqN/1+WVeM/eP6R6qlqi Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCECow ggUcMIIEBKADAgECAhEA4rtJSHkq7AnpxKUY8ZlYZjANBgkqhkiG9w0BAQsFADCBlzELMAkGA1UE BhMCR0IxGzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4GA1UEBxMHU2FsZm9yZDEaMBgG A1UEChMRQ09NT0RPIENBIExpbWl0ZWQxPTA7BgNVBAMTNENPTU9ETyBSU0EgQ2xpZW50IEF1dGhl bnRpY2F0aW9uIGFuZCBTZWN1cmUgRW1haWwgQ0EwHhcNMTkwMTAyMDAwMDAwWhcNMjIwMTAxMjM1 OTU5WjAkMSIwIAYJKoZIhvcNAQkBFhNkd213MkBpbmZyYWRlYWQub3JnMIIBIjANBgkqhkiG9w0B AQEFAAOCAQ8AMIIBCgKCAQEAsv3wObLTCbUA7GJqKj9vHGf+Fa+tpkO+ZRVve9EpNsMsfXhvFpb8 RgL8vD+L133wK6csYoDU7zKiAo92FMUWaY1Hy6HqvVr9oevfTV3xhB5rQO1RHJoAfkvhy+wpjo7Q cXuzkOpibq2YurVStHAiGqAOMGMXhcVGqPuGhcVcVzVUjsvEzAV9Po9K2rpZ52FE4rDkpDK1pBK+ 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