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=-0.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS autolearn=ham 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 E0190C10F13 for ; Thu, 11 Apr 2019 09:25:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 940EF217D4 for ; Thu, 11 Apr 2019 09:25:34 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="W9gJcZg9" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726728AbfDKJZd (ORCPT ); Thu, 11 Apr 2019 05:25:33 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:59774 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726562AbfDKJZc (ORCPT ); Thu, 11 Apr 2019 05:25:32 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Mime-Version:Content-Type:References: In-Reply-To:Date:To:From:Subject:Message-ID:Sender:Reply-To:Cc: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=Kq3KM4OvalYtZxq4HJlDNDkD+aRkH2hrGAnuWjtYWA0=; b=W9gJcZg955gHyXpP7W0M2oX2C dYWDPFwDByBidHIk1GGPl7B9IMVPgWZ7r8+mr71X65S+qjgp43JzLpyI/eWt8uj0QdIA7KNxevDUG ZqOt0+iViQqtzD9gWN5zz80eB/s6XWW74avcMYniVNrwPcPzyOSMUztWaheD6mMKB7m5JqaUmL8GY wWgez0n7MJB0FcGp+3ihBhZVJ3Rcks0Zm1J06vekiMHOw4SoNG9ZnwE2qZu8Dh2J1nKApHPO1+E17 MW6J6W7ihJmGTy7ac2IFRhL4lrsS5BOu5p2tXQv/aLDb46XE8RMFtZQVeo8SV3M2S3jNv2DK+gDba 5H3b+EGlw==; Received: from 54-240-197-239.amazon.com ([54.240.197.239] helo=u3832b3a9db3152.ant.amazon.com) by bombadil.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1hEVxb-000204-C0; Thu, 11 Apr 2019 09:25:31 +0000 Message-ID: Subject: Re: Tun congestion/BQL From: David Woodhouse To: Jason Wang , Toke =?ISO-8859-1?Q?H=F8iland-J=F8rgensen?= , netdev@vger.kernel.org Date: Thu, 11 Apr 2019 12:25:28 +0300 In-Reply-To: <1db61c0b-afa5-b549-e930-8c385f939156@redhat.com> References: <2e310fc6ee847d20dd23692fd1db733e607602f5.camel@infradead.org> <1506fcbbfb7ab7a1e448b7b6cbf45f703bfcc80f.camel@infradead.org> <8c64c80d-165c-076b-fca3-5374edc87853@redhat.com> <87ftqqugbj.fsf@toke.dk> <123cfccb766a6f55312d6a477764d3e7b88ad221.camel@infradead.org> <875zrlvr9a.fsf@toke.dk> <77c0f7fb5bd0e0ba524605ecfbd33c4a19b56782.camel@infradead.org> <1db61c0b-afa5-b549-e930-8c385f939156@redhat.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-1C1UhQ2EOxa6/UnhRotO" X-Mailer: Evolution 3.28.5-0ubuntu0.18.04.1 Mime-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org --=-1C1UhQ2EOxa6/UnhRotO Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2019-04-11 at 15:22 +0800, Jason Wang wrote: > If you care about userspace performance, you may want to try vhost + TAP= =20 > instead. I admit the API is not user friendly which needs to be improved= =20 > but then there will be no syscall overhead on packet transmission and=20 > receiving, and eventfd will be used for notification. That would be very useful. Is there any example code I can follow? --=-1C1UhQ2EOxa6/UnhRotO 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+ uOAyOkgIg/cD8Kugav5tyapydeWMZRJQH1vMQ6OVT24CyAn2yXm2NgTQMS1mpzStP2ioPtTnszIQ 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