2001-04-01 10:41:47

by Chip Salzenberg

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Subject: Re: TCP Vegas implementation for Linux

Our (VA's) kernel includes a Vegas patch:

ftp://ftp.valinux.com/pub/people/chip/linux-vegas-v2-patch-2.2

--
Chip Salzenberg - a.k.a. - <[email protected]>
"We have no fuel on board, plus or minus 8 kilograms." -- NEAR tech


2001-04-01 10:53:38

by Dan Hollis

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Subject: Re: TCP Vegas implementation for Linux

On Sun, 1 Apr 2001, Chip Salzenberg wrote:
> Our (VA's) kernel includes a Vegas patch:
> ftp://ftp.valinux.com/pub/people/chip/linux-vegas-v2-patch-2.2

tcp vegas performs very badly for me on asymmetric links (e.g. adsl),
about 50% performance loss vs non-vegas.

-Dan

2001-04-01 11:04:18

by David Miller

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Subject: Re: TCP Vegas implementation for Linux


Dan Hollis writes:
> tcp vegas performs very badly for me on asymmetric links (e.g. adsl),
> about 50% performance loss vs non-vegas.

This among other reasons is why I ripped out vegas from the
kernel a couple years ago. I'm actually disappointed vendors
have added this patch because it is still a reasearch problem
as to whether vegas's behavior negatively impacts the overall
internet when clients use it or not.

Sure it's sysctl controlled and disabled by default, but it really
should not be there at all as it's all too tempting to enable
this greedy behavior since it can in many cases improve performance
for the person using vegas (but not necessarily for other machines
not doing vegas but sharing the pipe with the vegas guys flows, they
can be negatively impacted).

Later,
David S. Miller
[email protected]

2001-04-01 10:59:38

by David Miller

[permalink] [raw]
Subject: Re: TCP Vegas implementation for Linux


Chip Salzenberg writes:
> Our (VA's) kernel includes a Vegas patch:
>
> ftp://ftp.valinux.com/pub/people/chip/linux-vegas-v2-patch-2.2

Slight typo in the URL, it's:

ftp://ftp.valinux.com/pub/people/chip/kernel/linux-vegas-v2-patch-2.2

Later,
David S. Miller
[email protected]