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Date: Wed, 19 Feb 2014 18:06:34 +0100
From: Matija Glavinic Pecotic <matija.glavinic-pecotic.ext@....com>
To: ext Fengguang Wu <fengguang.wu@...el.com>
CC: LKML <linux-kernel@...r.kernel.org>,
Linux Netdev List <netdev@...r.kernel.org>,
"linux-sctp@...r.kernel.org" <linux-sctp@...r.kernel.org>
Subject: Re: [sctp] ef2820a735: -50% netperf Throughput_Mbps
Hello Fengguang,
On 02/19/2014 02:20 PM, ext Fengguang Wu wrote:
> Hi Matija,
>
> We noticed the below changes on commit ef2820a735f74ea60335f8ba3801b844f0cb184d
> (" net: sctp: Fix a_rwnd/rwnd management to reflect real state of the receiver's buffer")
> in netperf SCTP_STREAM tests:
thanks for the info. Though, I've ran netperf in my environment, with and without patch, and I havent observed any difference.
Could you please give me information on your environment, how do you invoke netperf, and other details you think I might be interested in to observe problem by myself
Thanks!
> cd0f0b95fd2cd2b ef2820a735f74ea60335f8ba3
> --------------- -------------------------
> 8 ~ 0% -50.0% 4 ~ 0% TOTAL netperf.Throughput_Mbps
> 54287 ~44% +338.1% 237842 ~48% TOTAL cpuidle.C1E-NHM.time
> 12008353 ~12% -56.0% 5281848 ~ 0% TOTAL proc-vmstat.pgalloc_normal
> 114861 ~ 0% -50.3% 57085 ~ 3% TOTAL softirqs.NET_RX
> 12964639 ~11% -55.1% 5818663 ~ 0% TOTAL proc-vmstat.pgfree
> 866489 ~ 0% -43.3% 491417 ~ 0% TOTAL proc-vmstat.pgalloc_dma32
> 119373 ~17% -39.1% 72661 ~ 1% TOTAL softirqs.SCHED
> 1985 ~13% -24.3% 1502 ~19% TOTAL slabinfo.kmalloc-128.active_objs
> 2139 ~20% -28.4% 1532 ~ 4% TOTAL proc-vmstat.nr_alloc_batch
> 124360 ~33% -31.0% 85748 ~ 2% TOTAL softirqs.RCU
> 1977 ~ 9% -18.5% 1610 ~ 9% TOTAL slabinfo.UDP.active_objs
> 1977 ~ 9% -18.5% 1610 ~ 9% TOTAL slabinfo.UDP.num_objs
> 2066 ~ 6% -12.9% 1800 ~ 7% TOTAL slabinfo.kmalloc-128.num_objs
> 1738 ~10% -18.4% 1418 ~ 9% TOTAL slabinfo.UDPv6.active_objs
> 1738 ~10% -18.4% 1418 ~ 9% TOTAL slabinfo.UDPv6.num_objs
> 923 ~10% -17.7% 760 ~ 8% TOTAL slabinfo.TCPv6.active_objs
> 923 ~10% -17.7% 760 ~ 8% TOTAL slabinfo.TCPv6.num_objs
> 989 ~ 9% -17.1% 820 ~ 7% TOTAL slabinfo.TCP.active_objs
> 989 ~ 9% -17.1% 820 ~ 7% TOTAL slabinfo.TCP.num_objs
> 398761 ~44% -32.6% 268792 ~ 3% TOTAL numa-vmstat.node2.numa_hit
> 389672 ~49% -32.9% 261443 ~ 3% TOTAL numa-vmstat.node0.numa_hit
> 447 ~ 1% -13.8% 385 ~ 0% TOTAL vmstat.system.cs
>
> Note: the "~ XX%" numbers are stddev percent.
>
> netperf.Throughput_Mbps
>
> 4 *+-*--*--*--*-*--*--*--*--*--*--*--*-*--*--*--*--*--*--*--*-*--*--*--*
> | |
> | |
> 3.5 ++ |
> | |
> | |
> | |
> 3 ++ |
> | |
> | |
> 2.5 ++ |
> | |
> | |
> | |
> 2 O+-O--O--O--O-O--O--O--O--O--O--O--O-O--O--O--O--O--O--O-------------+
>
>
> vmstat.system.cs
>
> 460 ++------------------------*--*----------------*----------------------+
> | .*.. .*.. : + + *.. .*
> 450 ++ *. .*. *.. : + .*..*.. + *..*..*.. + .*. |
> 440 *+ : * : *..* * * *. |
> |: : * |
> 430 ++: : |
> 420 ++: : |
> | * |
> 410 ++ |
> 400 ++ |
> | |
> 390 ++ O O O O O |
> 380 O+ O O O O O O O O O O O O O |
> | O |
> 370 ++-------------------------------------------------------------------+
>
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