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SubjectRe: [sctp] ef2820a735: -50% netperf Throughput_Mbps
Hi Matija,

On Wed, Feb 19, 2014 at 06:06:34PM +0100, Matija Glavinic Pecotic wrote:
> 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

I see the same regression on both T410 and NHM EX server. On each test
machine, I'm running (2*nr_logical_cpu) the below command in parallel:

netperf -t SCTP_STREAM -c -C -l 120

Thanks,
Fengguang

> 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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