From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: mail.toke.dk; spf=pass smtp.mailfrom=; dkim=pass header.d=g001.emailsrvr.com; arc=none (Message is not ARC signed); dmarc=fail (Used From Domain Record) header.from=deepplum.com policy.dmarc=none Received: from smtp79.iad3a.emailsrvr.com (smtp79.iad3a.emailsrvr.com [173.203.187.79]) by mail.toke.dk (Postfix) with ESMTPS id B43E6677D6C for ; Sat, 13 Sep 2025 22:33:13 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=g001.emailsrvr.com; s=feedback; t=1757795591; bh=CB8oSXoOmNplC5PlpJyKkXUlJm37+O4b4so/lGyXbfc=; h=Date:Subject:From:To:From; b=kNOSlh/S8mzgOYHNNvItatOQPT8PlJLOa+6hGnJrLvJWMj6XDEEMtbTb7lU2tvzEY 1SdAgbYlZtwfu/Wtv9JHS6iHciR5vSDz2wZgrNAuSNQ6uu0u/Nf9QlWU+k4JjQL5yE cPyj7odL+kvUMSURzAJeNHeXmPqkcVqe0a9LeDAE= Received: from app62.wa-webapps.iad3a (relay-webapps.rsapps.net [172.27.255.140]) by smtp2.relay.iad3a.emailsrvr.com (SMTP Server) with ESMTP id A04262825; Sat, 13 Sep 2025 16:33:11 -0400 (EDT) Received: from deepplum.com (localhost.localdomain [127.0.0.1]) by app62.wa-webapps.iad3a (Postfix) with ESMTP id 80F7A60006; Sat, 13 Sep 2025 16:33:11 -0400 (EDT) Received: by apps.rackspace.com (Authenticated sender: dpreed@deepplum.com, from: dpreed@deepplum.com) with HTTP; Sat, 13 Sep 2025 16:33:11 -0400 (EDT) X-Auth-ID: dpreed@deepplum.com Date: Sat, 13 Sep 2025 16:33:11 -0400 (EDT) From: "David P. Reed" To: "Tom Herbert" Cc: "Frantisek Borsik" , "Cake List" , codel@lists.bufferbloat.net, "bloat" , "Jeremy Austin via Rpm" MIME-Version: 1.0 Importance: Normal X-Priority: 3 (Normal) X-Type: html In-Reply-To: References: <1757449551.421420786@apps.rackspace.com> X-Client-IP: 209.6.168.128 Message-ID: <1757795591.523513612@apps.rackspace.com> X-Mailer: webmail/19.0.28-RC X-Classification-ID: 7590e1de-edcc-4700-9648-ccde2a3a873c-1-1 Message-ID-Hash: RW4E5IV3NVB67ADMIFWIEWA4KCHVT3JK X-Message-ID-Hash: RW4E5IV3NVB67ADMIFWIEWA4KCHVT3JK X-MailFrom: dpreed@deepplum.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; loop; banned-address; emergency; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="UTF-8" X-Content-Filtered-By: Mailman/MimeDel 3.3.10 X-Mailman-Version: 3.3.10 Precedence: list Subject: [Bloat] Re: [Cake] Re: XDP2 is here - from one and only Tom Herbert (almost to the date, 10 years after XDP was released) List-Id: General list for discussing Bufferbloat Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: ClRvbSAtCiAKQW4gYXJjaGl0ZWN0dXJlLWluZGVwZW5kZW50IG5ldHdvcmsgZnJhbWV3b3JrIGlu ZGVwZW5kZW50IG9mIHRoZSBPUyBrZXJuZWwncyBwZWN1bGlhcml0aWVzIHNlZW1zIHdpdGhpbiBy ZWFjaCAodGhvdWdoIGEgZmFpciBiaXQgb2Ygd29yayksIGFuZCBJIHRoaW5rIGl0IHdvdWxkIGJl IGEgR09PRCBUSElORyBpbmRlZWQuIElNSE8gdGhlIExpbnV4IG5ldHdvcmtpbmcgc3RhY2sgaW4g dGhlIGtlcm5lbCBpcyBhIGhvcnJpZmljIG1lc3MsIGFuZCBpdCBkb2Vzbid0IGhhdmUgdG8gYmUu CiAKVGhlIHJlYXNvbiBpdCBkb2Vzbid0IGhhdmUgdG8gYmUgaXMgdGhhdCB0aGVyZSBzaG91bGQg YmUgbm8gcmVhc29uIGl0IGNhbm5vdCBydW4gaW4gcmluZzMvdXNlcmxhbmQsIGp1c3QgbGlrZSBE UERLLiBBbmQgaXQgc2hvdWxkIGJlIGJ1aWx0IHVzaW5nICJyZWFsLXRpbWUiIHVzZXJsYW5kIHBy b2dyYW1taW5nIHRlY2huaXF1ZXMuIChhdm9pZGluZyB0aGUgZ2VuZXJpYyBsaW51eCBzY2hlZHVs ZXIpLiBUaGUgT05MWSByZWFzb24gZm9yIGludm9sdmluZyB0aGUgc2NoZWR1bGVyIHdvdWxkIGJl IGJlY2F1c2UgdGhlcmUgYXJlbid0IGVub3VnaCBjb3Jlcy4gTGludXggd2FzIGRlc2lnbmVkIHRv IGJlIGEgdW5pcHJvY2Vzc29yIFVuaXgsIGFuZCB0aGF0IGp1c3QgaXMgbm8gbG9uZ2VyIHRydWUg YXQgYWxsLiBXaXRoIGh5cGVydGhyZWFkaW5nLCB0b28sIG9uZSBuZWVkIG5ldmVyIGFiYW5kb24g YSBwcm9jZXNzb3IncyBjb250ZXh0IGluIHVzZXJzcGFjZSB0byBydW4gc29tZSAidXNlcmxhbmQi IGFwcGxpY2F0aW9uLgoKVGhpcyB3b3VsZCByaXAgYSBodWdlIGFtb3VudCBvZiBrZXJuZWwgY29k ZSBvdXQgb2YgdGhlIGtlcm5lbC4gKGF0IGxlYXN0IDUwJSwgYW5kIHByb2JhYmx5IG1vcmUpLiBU SGUgc2VjdXJpdHkgaXNzdWVzIG9mIGFsbCB0aG9zZSAzcmQgcGFydHkgbmV0d29yayBkcml2ZXJz IHdvdWxkIGdvIGF3YXkuCgpBbmQgdGhlIHBlcmZvcm1hbmNlIHdvdWxkIGJlIG11Y2ggaGlnaGVy IGZvciBuZXR3b3JraW5nLiAgKHJ1bm5pbmcgaW4gcmluZyAzLCBlc3BlY2lhbGx5IGlmIHlvdSBk b24ndCBkbyBzeXN0ZW0gY2FsbHMsIGlzIG5vIHBlcmZvcm1hbmNlIHBlbmFsdHksIGFuZCBpbnRl cnByb2Nlc3NvciBjb21tdW5pY2F0aW9ucyB1c2luZyBzaGFyZWQgbWVtb3J5IGlzIG11Y2ggbG93 ZXIgbGF0ZW5jeSB0aGFuIExpbnV4IElQQyBvciBtdXRleGVzKS4KIApJIGxpa2UgdGhlIGlkZWEg b2YgYSBjb21waWxhdGlvbiBiYXNlZCBuZXR3b3JrIHN0YWNrLCBhdCBhIHNsaWdodGx5IGhpZ2hl ciBsZXZlbCB0aGFuIEMuIGVCUEYgaXMgTk9UIHdoYXQgSSBoYXZlIGluIG1pbmQgLSBpdCdzIGFu IGludGVycHJldGVyIHdpdGggaGlnaCBvdmVyaGVhZC4gVGhlIGxhbmd1YWdlIHNob3VsZCBzdXBw b3J0IGhpZ2gtcGVyZm9ybWFuY2UgY28tcm91dGluaW5nIC0gc2hhcmVkIG1lbW9yeSwgaWRlYWxs eS4gSSBkb24ndCB0aGluZyBHQyBpcyBhIGdvb2QgdGhpbmcuIFJ1c3QgbWlnaHQgYmUgYSBnb29k IHN0YXJ0aW5nIHBvaW50IGJlY2F1c2UgaXRzIG1lbW9yeSBtYW5hZ2VtZW50IGlzIHNhZmUuClRv IG1lLCBzb21lIG9mIHdoYXQgdGhlIGJhc2Ugb2YgRFBESyBpcyBsaWtlIGlzIGdvb2Qgc3R1ZmYu IEhvd2V2ZXIsIGl0IGlzbid0IGFyY2hpdGVjdHVyYWxseSBuZXV0cmFsLgoKVG8gbWUsIHRoZSBu ZXR3b3JrIHN0YWNrIHNob3VsZCBub3QgYmUgZW50YW5nbGVkIHdpdGggaW50ZXJydXB0IGhhbmRs aW5nIGF0IGFsbC4gInBvbGxpbmciIGlzIGZhciBtb3JlIHBlcmZvcm1hbnQgdW5kZXIgbG9hZC4g VGhlIG9ubHkgdXNlIGZvciBpbnRlcnJ1cHRzIGlzIHdoZW4gdGhlIG5ldHdvcmsgc3RhY2sgaXMg Y29tcGxldGVseSBpZGxlLiBUaGF0IHdvdWxkIGJlLCBpbiB1c2VybGFuZCwgYSAid2FpdCBmb3Ig aW50ZXJydXB0IiBjYWxsIChub3QgYSBwb2xsKS4gSWRlYWxseSwgb24gcmVjZW50IEludGVsIG1h Y2hpbmVzLCBhIHVzZXJzcGFjZSB2ZXJzaW9uIG9mIE1PTklUT1IvTVdBSVQpLgoKTm93IEkga25v dyB0aGF0IExpbnVzIGFuZCBoaXMgY3JldyBhcmUgcmVhbGx5IE5PVCBnb25uYSBsaWtlIHRoaXMu IExpbnVzIGlzIHN0aWxsIHRoaW5raW5nIGxpa2UgTUlOSVgsIGEgdW5pcHJvY2Vzc29yIHRpbWUt c2hhcmluZyBzeXN0ZW0gd2l0aCByaWNoIE9TIGZ1bmN0aW9ucyBpbiB0aGUga2VybmVsIGFuZCBk b2luZyAiZmlsZSIgcmVhZHMgYW5kIHdyaXRlcyB0byBjb21tdW5pY2F0ZSB3aXRoIHRoZSBrZXJu ZWwgc3RhdGUuIEJ1dCBpdCBpcyBhIG11Y2ggbW9yZSBtb2Rlcm4gd2F5IHRvIHRoaW5rIG9mIHJl YWwtdGltZSBJTyBpbiBhIG1vZGVybiBvcGVyYXRpbmcgc3lzdGVtLiAoV2luZG93cyBhbmQgbWFj T1MgYXJlIGFsc28gVW5peC1saWtlLCB1bmlwcm9jZXNzb3IgbW9ub2xpdGhpYyBrZXJuZWwgZGVz aWducykuCgpTbywgaWYgWERQMiBnb3QgYXdheSBmcm9tIHRoZSBMaW51eCBrZXJuZWwsIGl0IGNv dWxkIGJlIGdyZWF0LgpCVFcsIGlvX3VyaW5nLCBldGMuIGFyZSBoYWxmLW1lYXN1cmVzLiBUaGV5 IGFkZHJlc3MgZ2V0dGluZyBhd2F5IGZyb20gaW50ZXJydXB0cyB0b3dhcmQgcG9sbGluZywgYnV0 IHRoZXkgc3RpbGwgbWFrZSB0aGUgbWlzdGFrZSBvZiBrZWVwaW5nIGh1Z2UgZHJpdmVycyBpbiB0 aGUga2VybmVsLgogCiAKT24gVHVlc2RheSwgU2VwdGVtYmVyIDksIDIwMjUgMTc6MzYsICJUb20g SGVyYmVydCIgPHRvbUBoZXJiZXJ0bGFuZC5jb20+IHNhaWQ6CgoKCgoKCgoKCk9uIFR1ZSwgU2Vw IDksIDIwMjUsIDU6MDPigK9QTSBGcmFudGlzZWsgQm9yc2lrIDxbIGZyYW50aXNlay5ib3JzaWtA Z21haWwuY29tIF0oIG1haWx0bzpmcmFudGlzZWsuYm9yc2lrQGdtYWlsLmNvbSApPiB3cm90ZTpU aGFua3MgYSBsb3QsIERhdmlkLgoKIEkgaGF2ZSBhc2tlZCBUb20gaWYgaGUgd2FudHMgdG8gam9p biB1cyBhbmQgaGUgc2hvdWxkIGJlIGhlcmUgdG8gY2hhdCB3aXRoCiB1cyBub3cuCgogQWxsIHRo ZSBiZXN0LAoKIEZyYW5rCgogRnJhbnRpc2VrIChGcmFuaykgQm9yc2lrCgoKICpJbiBsb3Zpbmcg bWVtb3J5IG9mIERhdmUgVMOkaHQ6ICoxOTY1LTIwMjUKClsgaHR0cHM6Ly9saWJyZXFvcy5pby8y MDI1LzA0LzAxL2luLWxvdmluZy1tZW1vcnktb2YtZGF2ZS8gXSggaHR0cHM6Ly9saWJyZXFvcy5p by8yMDI1LzA0LzAxL2luLWxvdmluZy1tZW1vcnktb2YtZGF2ZS8gKQoKClsgaHR0cHM6Ly93d3cu bGlua2VkaW4uY29tL2luL2ZyYW50aXNla2JvcnNpayBdKCBodHRwczovL3d3dy5saW5rZWRpbi5j b20vaW4vZnJhbnRpc2VrYm9yc2lrICkKCiBTaWduYWwsIFRlbGVncmFtLCBXaGF0c0FwcDogKzQy MTkxOTQxNjcxNAoKIGlNZXNzYWdlLCBtb2JpbGU6ICs0MjA3NzUyMzA4ODUKCiBTa3lwZTogY2Fz aW9hNTMwMmNhCgpbIGZyYW50aXNlay5ib3JzaWtAZ21haWwuY29tIF0oIG1haWx0bzpmcmFudGlz ZWsuYm9yc2lrQGdtYWlsLmNvbSApCgoKIE9uIFR1ZSwgU2VwIDksIDIwMjUgYXQgMTA6MjXigK9Q TSBEYXZpZCBQLiBSZWVkIDxbIGRwcmVlZEBkZWVwcGx1bS5jb20gXSggbWFpbHRvOmRwcmVlZEBk ZWVwcGx1bS5jb20gKT4gd3JvdGU6CgogPiBIaSBGcmFuayAtCiA+CiA+CiA+CiA+IEkgdGhpbmsg aXQgaXMgaW50ZXJlc3RpbmcgYXMgYSBjb25jZXB0LiBBIHByb2plY3QgSSBhbSBhZHZpc2luZyBo YXMgYmVlbgogPiB1c2luZyBEUERLIHZlcnkgZWZmZWN0aXZlbHkgdG8gZ2V0IHJpZCBvZiB0aGUg aHVnZSBwYXRoIGFuZCBsb2NraW5nIGRlbGF5cwogPiBpbiB0aGUgY3VycmVudCBMaW51eCBuZXR3 b3JrIHN0YWNrLiBYRFAyIGNvdWxkIGJlIHN1cHBvcnRlZCBpbiBhIHJpbmczCiA+ICh1c2VyKSBh ZGRyZXNzIHNwYWNlLCBhY2hpZXZpbmcgYSBzaW1pbGFyIHJlc3VsdC4KSEkgRGF2aWQsClRoZSBp ZGVhIGlzIHlvdSBjb3VsZCB3cml0ZSB0aGUgY29kZSBpbiBYRFAyIGFuZCBpdCB3b3VsZCBiZSBj b21waWxlZCB0byBEUERLIG9yIGVCUEYgYW5kIHRoZSBjb21waWxlciB3b3VsZCBoYW5kbGUgdGhl IG9wdGltaXphdGlvbnMuCiA+CiA+CiA+CiA+IEJ1dCBJIGRvbid0IHRoaW5rIFhEUDIgaXMgZ29p bmcgdGhhdCBkaXJlY3Rpb24gLSBzbyBpdCBtYXkgYmUgc3R1Y2tpbnRvCiA+IHRoZSBtZXNzIG9m IGtlcm5lbCBzcGFjZSBuZXR3b3JraW5nLiBBZGRpbmcgZUJQRiBvbmx5IGhhcyBtYWRlIHRoaXMg bW9yZSBvZgogPiBhIG1lc3MsIGJ5IHRoZSB3YXkgKGFuZCBhZGRpbmcgYSBuZXcgImNvbXBpbGVy IiB0aGF0IG5lZWRzIHRvIGJlIHZlcmlyaWVkCiA+IGFzIHNhZmUgZm9yIHRoZSBrZXJuZWwpLgpU aGluayBvZiBYRFAyIGFzIHRoZSBnZW5lcmFsaXphdGlvbiBvZiBYRFAgdG8gZ28gYmV5b25kIGp1 c3QgdGhlIGtlcm5lbC4gVGhlIGlkZWEgaXMgdGhhdCB0aGUgdXNlciB3cml0ZXMgdGhlaXIgZGF0 YXBhdGggY29kZSBvbmNlIGFuZCB0aGV5IGNvbXBpbGUgaXQgdG8gcnVuIGluIHdoYXRldmVyIHRh cmdldHMgdGhleSBoYXZlLS0gRFBESywgUDQsIG90aGVyIHByb2dyYW1tYWJsZSBoYXJkd2FyZSwg YW5kIHllcyBYRFAvZUJQRi4gSXQncyByZWFsbHkgbm90IGxpbWl0ZWQgdG8ga2VybmVsIG5ldHdv cmtpbmcuCkFzIGZvciB0aGUgbmFtZSBYRFAyLCB3aGVuIHdlIGNyZWF0ZWQgWERQLCBlWHByZXNz IERhdGFQYXRoLCBteSB2aXNpb24gd2FzIHRoYXQgaXQgd291bGQgYmUgaW1wbGVtZW50YXRpb24g YWdub3N0aWMuIGVCUEYgd2FzIHRoZSBmaXJzdCBpbnN0YW50aWF0aW9uIGZvciBwcmFjdGljYWxp dHksIGJ1dCBub3cgdGVuIHllYXJzIGxhdGVyIEkgdGhpbmsgd2UgY2FuIHJlYWxpemUgdGhlIGlu aXRpYWwgdmlzaW9uLgpUb20KCj4KID4gSSB3aWxsIGJlIHdhdGNoaW5nIGhvdyB0aGlzIGV2b2x2 ZXMuCiA+CiA+CiA+CiA+IERhdmlkCiA+CiA+CiA+CiA+IE9uIFR1ZXNkYXksIFNlcHRlbWJlciA5 LCAyMDI1IDA2OjMyLCAiRnJhbnRpc2VrIEJvcnNpayIgPAogPiBbIGZyYW50aXNlay5ib3JzaWtA Z21haWwuY29tIF0oIG1haWx0bzpmcmFudGlzZWsuYm9yc2lrQGdtYWlsLmNvbSApPiBzYWlkOgog PgogPiA+IEhlbGxvIHRvIGFsbCwKID4gPgogPiA+IExvb2tzIGludGVyZXN0aW5nOgogPiA+CiA+ IFsgaHR0cHM6Ly9tZWRpdW0uY29tL0B0b21fODQ5MTIveGRwMi10aGlzLWNoYW5nZXMtZXZlcnl0 aGluZy1hdC1sZWFzdC1mb3ItYWktbWwtaW5mcmFzdHJ1Y3R1cmUtODUwYzFiYTgyNzcxIF0oIGh0 dHBzOi8vbWVkaXVtLmNvbS9AdG9tXzg0OTEyL3hkcDItdGhpcy1jaGFuZ2VzLWV2ZXJ5dGhpbmct YXQtbGVhc3QtZm9yLWFpLW1sLWluZnJhc3RydWN0dXJlLTg1MGMxYmE4Mjc3MSApCiA+ID4KID4g PgogPiA+IEFsbCB0aGUgYmVzdCwKID4gPgogPiA+IEZyYW5rCiA+ID4KID4gPiBGcmFudGlzZWsg KEZyYW5rKSBCb3JzaWsKID4gPgogPiA+CiA+ID4gKkluIGxvdmluZyBtZW1vcnkgb2YgRGF2ZSBU w6RodDogKjE5NjUtMjAyNQogPiA+CiA+ID4gWyBodHRwczovL2xpYnJlcW9zLmlvLzIwMjUvMDQv MDEvaW4tbG92aW5nLW1lbW9yeS1vZi1kYXZlLyBdKCBodHRwczovL2xpYnJlcW9zLmlvLzIwMjUv MDQvMDEvaW4tbG92aW5nLW1lbW9yeS1vZi1kYXZlLyApCiA+ID4KID4gPgogPiA+IFsgaHR0cHM6 Ly93d3cubGlua2VkaW4uY29tL2luL2ZyYW50aXNla2JvcnNpayBdKCBodHRwczovL3d3dy5saW5r ZWRpbi5jb20vaW4vZnJhbnRpc2VrYm9yc2lrICkKID4gPgogPiA+IFNpZ25hbCwgVGVsZWdyYW0s IFdoYXRzQXBwOiArNDIxOTE5NDE2NzE0CiA+ID4KID4gPiBpTWVzc2FnZSwgbW9iaWxlOiArNDIw Nzc1MjMwODg1CiA+ID4KID4gPiBTa3lwZTogY2FzaW9hNTMwMmNhCiA+ID4KID4gPiBbIGZyYW50 aXNlay5ib3JzaWtAZ21haWwuY29tIF0oIG1haWx0bzpmcmFudGlzZWsuYm9yc2lrQGdtYWlsLmNv bSApCiA+ID4gX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18K ID4gPiBDYWtlIG1haWxpbmcgbGlzdCAtLSBbIGNha2VAbGlzdHMuYnVmZmVyYmxvYXQubmV0IF0o IG1haWx0bzpjYWtlQGxpc3RzLmJ1ZmZlcmJsb2F0Lm5ldCApCiA+ID4gVG8gdW5zdWJzY3JpYmUg c2VuZCBhbiBlbWFpbCB0byBbIGNha2UtbGVhdmVAbGlzdHMuYnVmZmVyYmxvYXQubmV0IF0oIG1h aWx0bzpjYWtlLWxlYXZlQGxpc3RzLmJ1ZmZlcmJsb2F0Lm5ldCApCiA+ID4KID4KIF9fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCiBDYWtlIG1haWxpbmcgbGlz dCAtLSBbIGNha2VAbGlzdHMuYnVmZmVyYmxvYXQubmV0IF0oIG1haWx0bzpjYWtlQGxpc3RzLmJ1 ZmZlcmJsb2F0Lm5ldCApCiBUbyB1bnN1YnNjcmliZSBzZW5kIGFuIGVtYWlsIHRvIFsgY2FrZS1s ZWF2ZUBsaXN0cy5idWZmZXJibG9hdC5uZXQgXSggbWFpbHRvOmNha2UtbGVhdmVAbGlzdHMuYnVm ZmVyYmxvYXQubmV0ICk=