Re: Fwd: New Version Notification for draft-jaju-httpbis-zstd-window-size-00.txt
Nidhi Jaju <nidhijaju@google.com> Tue, 05 March 2024 04:56 UTC
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From: Nidhi Jaju <nidhijaju@google.com>
Date: Tue, 05 Mar 2024 13:55:37 +0900
Message-ID: <CAHARgnJUP_7-y9fm-MWVGcMEoq-RibaNaLidHShwdC0LcSsATA@mail.gmail.com>
To: Martin Thomson <mt@lowentropy.net>
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Subject: Re: Fwd: New Version Notification for draft-jaju-httpbis-zstd-window-size-00.txt
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Hi Martin, Thanks for taking a look and the comments! I agree that `Content-Encoding: zstd` should mean that encoders use <= 8MB and decoders support >= 8MB. This is key, and if there's a better way to word that, I'd love suggestions. The part that you mentioned about decoders being able to support a different limit was added as an attempt to explain that deployments of zstd operating in a private environment that don't care about interoperability should negotiate it out-of-band. Maybe I could change that text to something along the lines of: "Decoders that wish to support a lower limit and encoders that wish to emit frames requiring a larger window size MUST negotiate the limit out-of-band." What do you think? Also, do we need to address this case at all? It specifically only applies in situations where endpoints aren't trying to interoperate beyond a short list of peers. Best, Nidhi On Tue, Mar 5, 2024 at 1:12 PM Martin Thomson <mt@lowentropy.net> wrote: > This seems fine. And 8M is a fine choice of limit. > > However, I don't think that ㄟ( ▔, ▔ )ㄏ is a good interoperability strategy: > > > Decoders are free to support higher or lower limits, depending on local > limitations, if negotiated out-of-band. Many deployments of Zstandard > operate in controlled, private environments and can directly communicate > with their encoder and decoder to negotiate a higher or lower limit. > > I think that it is obvious that decoders could support more. But > supporting less would not be following the standard. The same goes for an > encoder that wants a larger window. > > We should encourage people to choose a different way of identifying that > content-coding. In other words, encoding > 8M or decoding < 8M is not > Content-Encoding: zstd. > > On Tue, Mar 5, 2024, at 14:16, Nidhi Jaju wrote: > > Hi all, > > > > I wrote a draft regarding window sizes in Zstandard Content Encoding > > that aims to update RFC8878 > > <https://datatracker.ietf.org/doc/html/rfc8878> to require a specific > > limit for improved interoperability. > > > > For context, we recently shipped zstd Content Encoding support in > > Chrome 123 and came across incompatibilities in the field where > > developers were confused when their compressed content was not able to > > be decoded by Chrome, but was correctly decoded by curl and the zstd > > CLI. Having an explicit agreed-upon limit would help deployers of zstd > > to align their implementations and cause less user friction. > > > > I believe this topic was also previously discussed at > > https://lists.w3.org/Archives/Public/ietf-http-wg/2021JulSep/0137.html > > and > > https://lists.w3.org/Archives/Public/ietf-http-wg/2023JulSep/0178.html. > > This was also discussed at the W3C WebPerf WG meeting > > < > https://docs.google.com/document/d/1ijP7yc6UXZVgzpXDVmBa7h70gxLpFcqdlOZzL3DRT_0/edit#heading=h.xn2d3li0b8op> > > > at TPAC 2023. > > > > Please let us know what you think. > > > > Best regards, > > Nidhi > > > > ---------- Forwarded message --------- > > From: <internet-drafts@ietf..org <mailto:internet-drafts@ietf.org>> > > Date: Tue, Mar 5, 2024 at 7:26 AM > > Subject: New Version Notification for > draft-jaju-httpbis-zstd-window-size-00.txt > > To: W. Felix P. Handte <felixh@meta.com>, Nidhi Jaju < > nidhijaju@google.com> > > > > > > A new version of Internet-Draft > draft-jaju-httpbis-zstd-window-size-00.txt has > > been successfully submitted by Nidhi Jaju and posted to the > > IETF repository. > > > > Name: draft-jaju-httpbis-zstd-window-size > > Revision: 00 > > Title: Window Sizing for Zstandard Content Encoding > > Date: 2024-03-04 > > Group: Individual Submission > > Pages: 5 > > URL: > > > https://www.ietf.org/archive/id/draft-jaju-httpbis-zstd-window-size-00.txt > > Status: > > https://datatracker.ietf.org/doc/draft-jaju-httpbis-zstd-window-size/ > > HTML: > > > https://www.ietf.org/archive/id/draft-jaju-httpbis-zstd-window-size-00.html > > HTMLized: > > > https://datatracker.ietf.org/doc/html/draft-jaju-httpbis-zstd-window-size > > > > > > Abstract: > > > > Deployments of Zstandard, or "zstd", can use different window sizes > > to limit memory usage during compression and decompression. Some > > browsers and user agents limit window sizes to mitigate memory usage > > concerns, causing interoperability issues. This document updates the > > window size limit in RFC8878 from a recommendation to a requirement > > in HTTP contexts. > > > > > > > > The IETF Secretariat
- Fwd: New Version Notification for draft-jaju-http… Nidhi Jaju
- Re: Fwd: New Version Notification for draft-jaju-… Martin Thomson
- Re: Fwd: New Version Notification for draft-jaju-… Nidhi Jaju
- Re: Fwd: New Version Notification for draft-jaju-… Martin Thomson
- Re: Fwd: New Version Notification for draft-jaju-… Watson Ladd
- Re: Fwd: New Version Notification for draft-jaju-… Nidhi Jaju