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From: David Miller <davem@davemloft.net>
To: eric.dumazet@gmail.com
Cc: stephen@networkplumber.org, ja@ssi.bg, ycheng@google.com,
	netdev@vger.kernel.org, ncardwell@google.com, brakmo@google.com
Subject: Re: [PATCH v7 net-next 2/2] tcp: switch rtt estimations to usec resolution
Date: Wed, 26 Feb 2014 17:04:39 -0500 (EST)	[thread overview]
Message-ID: <20140226.170439.506202474296777480.davem@davemloft.net> (raw)
In-Reply-To: <1393452168.26794.8.camel@edumazet-glaptop2.roam.corp.google.com>

From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Wed, 26 Feb 2014 14:02:48 -0800

> From: Eric Dumazet <edumazet@google.com>
> 
> Upcoming congestion controls for TCP require usec resolution for RTT
> estimations. Millisecond resolution is simply not enough these days.
> 
> FQ/pacing in DC environments also require this change for finer control
> and removal of bimodal behavior due to the current hack in
> tcp_update_pacing_rate() for 'small rtt'
> 
> TCP_CONG_RTT_STAMP is no longer needed.
> 
> As Julian Anastasov pointed out, we need to keep user compatibility :
> tcp_metrics used to export RTT and RTTVAR in msec resolution,
> so we added RTT_US and RTTVAR_US. An iproute2 patch is needed
> to use the new attributes if provided by the kernel.
> 
 ...
> With help from Julian Anastasov, Stephen Hemminger and Yuchung Cheng
> 
> Signed-off-by: Eric Dumazet <edumazet@google.com>
> Acked-by: Neal Cardwell <ncardwell@google.com>

Applied, thanks everyone.

  reply	other threads:[~2014-02-26 22:04 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-02-23  6:38 [PATCH net-next] tcp: switch rtt estimations to usec resolution Eric Dumazet
2014-02-23  7:36 ` Julian Anastasov
2014-02-23 17:55   ` Eric Dumazet
2014-02-23 18:50     ` [PATCH v2 " Eric Dumazet
2014-02-23 19:19       ` Yuchung Cheng
2014-02-23 21:41         ` Eric Dumazet
2014-02-24  4:42       ` [PATCH v3 " Eric Dumazet
2014-02-24 17:58         ` Eric Dumazet
2014-02-24 18:24         ` [PATCH v4 " Eric Dumazet
2014-02-24 20:47           ` Julian Anastasov
2014-02-24 22:13             ` Eric Dumazet
2014-02-24 23:01               ` Julian Anastasov
2014-02-24 23:31                 ` [PATCH v5 " Eric Dumazet
2014-02-24 23:51                   ` Stephen Hemminger
2014-02-25  0:15                     ` David Miller
2014-02-25  1:11                     ` Eric Dumazet
2014-02-25  1:38                       ` Eric Dumazet
2014-02-25  6:22                         ` [PATCH v6 net-next 1/2] net: add skb_mstamp infrastructure Eric Dumazet
2014-02-25  9:51                           ` David Laight
2014-02-25 12:21                             ` Eric Dumazet
2014-02-26 20:02                           ` David Miller
2014-02-26 20:29                             ` Eric Dumazet
2014-02-26 22:02                           ` [PATCH v7 " Eric Dumazet
2014-02-26 22:04                             ` David Miller
2014-02-25  6:22                         ` [PATCH v6 net-next 2/2] tcp: switch rtt estimations to usec resolution Eric Dumazet
2014-02-25 17:46                           ` Neal Cardwell
2014-02-25 18:17                             ` Eric Dumazet
2014-02-25 19:13                           ` Neal Cardwell
2014-02-26 22:02                           ` [PATCH v7 " Eric Dumazet
2014-02-26 22:04                             ` David Miller [this message]
2014-02-27  1:09                             ` Stephen Hemminger
2014-02-27  1:21                               ` Rick Jones
2014-02-27  9:57                                 ` David Laight
2014-02-27  2:25                               ` Eric Dumazet
2014-02-24 22:19           ` [PATCH v4 net-next] " Eric Dumazet
2014-02-28  5:20       ` [PATCH v2 " Andi Kleen
2014-02-28  6:14         ` Eric Dumazet
2014-02-28 13:31           ` Andi Kleen
2014-02-28 13:51             ` Eric Dumazet
2014-02-23 19:11     ` [PATCH " Julian Anastasov

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