From: Rick Jones <rick.jones2@hp.com>
To: "David Täht" <dave.taht@gmail.com>
Cc: netdev@vger.kernel.org, bloat-devel@lists.bufferbloat.net
Subject: Re: Asserting ECN from userspace?
Date: Fri, 07 Oct 2011 10:25:43 -0700 [thread overview]
Message-ID: <4E8F3617.5080001@hp.com> (raw)
In-Reply-To: <4E8BF6B2.6030101@gmail.com>
On 10/04/2011 11:18 PM, David Täht wrote:
>
> No sooner had I noted (with pleasure) the kernel's new ability to
> correctly set the dscp bits on IPv6 TCP streams without messing with the
> negotiated ECN status, that I found several use cases where being able
> to assert ECN from userspace (for either ipv4, or ipv6) would be useful.
> ...
> 3) Web Proxies. A web proxy could note when it was experiencing
> congestion on one side of the proxied connection (or another) and signal
> the other side to slow down.
> ...
> As for 3... perhaps a grantable network capability? A proxy could
> acquire privs to twiddle those bits before dropping root privs.
For 3, couldn't/shouldn't the proxy simply stop draining the appropriate
socket buffer to cause TCP's existing flow control to slow down that side?
rick jones
next prev parent reply other threads:[~2011-10-07 17:25 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-05 6:18 Asserting ECN from userspace? David Täht
2011-10-06 23:52 ` Andi Kleen
2011-10-07 5:23 ` Eric Dumazet
2011-10-07 17:25 ` Rick Jones [this message]
2011-10-13 11:30 ` Juliusz Chroboczek
-- strict thread matches above, loose matches on Subject: below --
2011-10-13 12:44 David Täht
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