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Date: Wed, 19 Feb 2014 21:20:34 +0800
From: Fengguang Wu <fengguang.wu@...el.com>
To: Matija Glavinic Pecotic <matija.glavinic-pecotic.ext@....com>
Cc: LKML <linux-kernel@...r.kernel.org>,
Linux Netdev List <netdev@...r.kernel.org>
Subject: [sctp] ef2820a735: -50% netperf Throughput_Mbps
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:
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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