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From: Rick Jones <rick.jones2@hp.com>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: nanditad@google.com, netdev@vger.kernel.org,
	mattmathis@google.com, codel@lists.bufferbloat.net,
	ncardwell@google.com, David Miller <davem@davemloft.net>
Subject: Re: [Codel] [RFC PATCH v2] tcp: TCP Small Queues
Date: Wed, 11 Jul 2012 11:44:21 -0700	[thread overview]
Message-ID: <4FFDC985.6050805@hp.com> (raw)
In-Reply-To: <1342019518.3265.8116.camel@edumazet-glaptop>

On 07/11/2012 08:11 AM, Eric Dumazet wrote:
>
> Some bench results about the choice of 128KB being the default value:

What were the starting/baseline figures?

>
> Tests using a single TCP flow.
>
> Tests on 10Gbit links :
>
>
> echo 16384 >/proc/sys/net/ipv4/tcp_limit_output_bytes
> OMNI Send TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.99.2 (192.168.99.2) port 0 AF_INET
> tcpi_rto 201000 tcpi_ato 0 tcpi_pmtu 1500 tcpi_rcv_ssthresh 14600
> tcpi_rtt 1875 tcpi_rttvar 750 tcpi_snd_ssthresh 16 tpci_snd_cwnd 79
> tcpi_reordering 53 tcpi_total_retrans 0
> Local       Local       Local  Elapsed Throughput Throughput  Local Local  Remote Remote Local   Remote  Service
> Send Socket Send Socket Send   Time               Units       CPU   CPU    CPU    CPU    Service Service Demand
> Size        Size        Size   (sec)                          Util  Util   Util   Util   Demand  Demand  Units
> Final       Final                                             %     Method %      Method
> 392360      392360      16384  20.00   1389.53    10^6bits/s  0.52  S      4.30   S      0.737   1.014   usec/KB

By the way, that double reporting of the local socket send size is fixed in:

------------------------------------------------------------------------
r516 | raj | 2012-01-05 15:48:52 -0800 (Thu, 05 Jan 2012) | 1 line

report the rsr_size_end in an omni stream test rather than a copy of the 
lss_size_end

of netperf and later.  Also, any idea why the local socket send size got 
so much larger with 1GbE than 10 GbE at that setting of 
tcp_limit_output_bytes?

> Tests on Gbit link :
>
>
> echo 16384 >/proc/sys/net/ipv4/tcp_limit_output_bytes
> OMNI Send TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 172.30.42.18 (172.30.42.18) port 0 AF_INET
> tcpi_rto 201000 tcpi_ato 0 tcpi_pmtu 1500 tcpi_rcv_ssthresh 14600
> tcpi_rtt 1875 tcpi_rttvar 750 tcpi_snd_ssthresh 30 tpci_snd_cwnd 274
> tcpi_reordering 3 tcpi_total_retrans 0
> Local       Local       Local  Elapsed Throughput Throughput  Local Local  Remote Remote Local   Remote  Service
> Send Socket Send Socket Send   Time               Units       CPU   CPU    CPU    CPU    Service Service Demand
> Size        Size        Size   (sec)                          Util  Util   Util   Util   Demand  Demand  Units
> Final       Final                                             %     Method %      Method
> 1264784     1264784     16384  20.01   689.70     10^6bits/s  0.22  S      15.05  S      0.634   7.149   usec/KB

rick jones

  parent reply	other threads:[~2012-07-11 18:44 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-06-28 17:07 [Codel] [PATCH net-next] fq_codel: report congestion notification at enqueue time Eric Dumazet
2012-06-28 17:51 ` Dave Taht
2012-06-28 18:12   ` Eric Dumazet
2012-06-28 22:56     ` Yuchung Cheng
2012-06-28 23:47       ` Dave Taht
2012-06-29  4:50         ` Eric Dumazet
2012-06-29  5:24           ` Dave Taht
2012-07-04 10:11           ` [Codel] [RFC PATCH] tcp: limit data skbs in qdisc layer Eric Dumazet
2012-07-09  7:08             ` David Miller
2012-07-09  8:03               ` Eric Dumazet
2012-07-09  8:48                 ` Eric Dumazet
2012-07-09 14:55               ` Eric Dumazet
2012-07-10 13:28                 ` Lin Ming
2012-07-10 15:13                 ` [Codel] [RFC PATCH v2] tcp: TCP Small Queues Eric Dumazet
2012-07-10 17:06                   ` Eric Dumazet
2012-07-10 17:37                   ` Yuchung Cheng
2012-07-10 18:32                     ` Eric Dumazet
2012-07-11 15:11                   ` Eric Dumazet
2012-07-11 15:16                     ` Ben Greear
2012-07-11 15:25                       ` Eric Dumazet
2012-07-11 15:43                         ` Ben Greear
2012-07-11 15:54                           ` Eric Dumazet
2012-07-11 16:03                             ` Ben Greear
2012-07-11 18:23                     ` Rick Jones
2012-07-11 23:38                       ` Eric Dumazet
2012-07-11 18:44                     ` Rick Jones [this message]
2012-07-11 23:49                       ` Eric Dumazet
2012-07-12  7:34                         ` Eric Dumazet
2012-07-12  7:37                           ` David Miller
2012-07-12  7:51                             ` Eric Dumazet
2012-07-12 14:55                               ` Tom Herbert
2012-07-12 13:33                   ` John Heffner
2012-07-12 13:46                     ` Eric Dumazet
2012-07-12 16:44                       ` John Heffner
2012-07-12 16:54                         ` Jim Gettys
2012-06-28 23:52 ` [Codel] [PATCH net-next] fq_codel: report congestion notification at enqueue time Nandita Dukkipati
2012-06-29  4:18   ` Eric Dumazet
2012-06-29  4:53 ` Eric Dumazet
2012-06-29  5:12   ` David Miller
2012-06-29  5:24     ` Eric Dumazet
2012-06-29  5:29       ` David Miller
2012-06-29  5:50         ` Eric Dumazet
2012-06-29  7:53           ` David Miller
2012-06-29  8:04           ` David Miller

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