Date: Tue, 23 May 2006 12:26:29 -0700 From: "Bruce A. Mah" <bmah@freebsd.org> To: mallman@icir.org Cc: freebsd-net@freebsd.org, Marcin Jessa <lists@yazzy.org>, mag@intron.ac Subject: Re: How to Quicken TCP Re-transmission? Message-ID: <447361E5.3040603@freebsd.org> In-Reply-To: <20060523185715.E0229416D24@lawyers.icir.org> References: <20060523185715.E0229416D24@lawyers.icir.org>
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[-- Attachment #1 --] If memory serves me right, Mark Allman wrote: >> Thank you for your reminder. Actually, I understand you and >> RFC 2018. What I really concern is how wide support (and being enabled >> by default) SACK has obtained. For we do not always transfer data >> between hosts running FreeBSD and maintained by network expert. > > SACK is quite widely deployed. See: > > Alberto Medina, Mark Allman, Sally Floyd. Measuring the Evolution of > Transport Protocols in the Internet. ACM Computer Communication > Review, 35(2), April 2005. > http://www.icir.org/mallman/papers/tcp-evo-ccr05.ps What a trip, I just read this paper on the train to work this morning. FWIW, I thought this was a well-done study on an interesting topic. A question and a nitpick: Did you try doing any stack fingerprinting to get some idea of the mix of TCP/IP stacks among the servers / clients you examined? The percentages in the commentary on Table 5 in the text (second column of p. 41 in the CCR printing) are sometimes one-off from the percentages actually shown in Table 5. It took me several tries to get through the "huh?!?"-ness of this, though the lack of caffeine in my bloodstream at the time might have been a contributing factor. :-) Cheers, Bruce. [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (FreeBSD) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFEc2Hq2MoxcVugUsMRAohGAJ9gE8ypS1quauro2ZnR8jtGxdhM5gCeKbT5 4o3RBCnOdes1SN7UFEOUBMI= =/3g8 -----END PGP SIGNATURE-----
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