netdev - Re: [PATCH v2 0/2] net/sctp: Avoid allocating high order memory with kmalloc()

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Date:   Thu, 9 Aug 2018 11:43:17 +0300
From:   Konstantin Khorenko <khorenko@...tuozzo.com>
To:     Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
Cc:     oleg.babin@...il.com, netdev@...r.kernel.org,
        linux-sctp@...r.kernel.org,
        "David S . Miller" <davem@...emloft.net>,
        Vlad Yasevich <vyasevich@...il.com>,
        Neil Horman <nhorman@...driver.com>,
        Xin Long <lucien.xin@...il.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>
Subject: Re: [PATCH v2 0/2] net/sctp: Avoid allocating high order memory with
 kmalloc()

On 08/04/2018 02:36 AM, Marcelo Ricardo Leitner wrote:
> On Fri, Aug 03, 2018 at 07:21:00PM +0300, Konstantin Khorenko wrote:
> ...
>> Performance results:
>> ====================
>>   * Kernel: v4.18-rc6 - stock and with 2 patches from Oleg (earlier in this thread)
>>   * Node: CPU (8 cores): Intel(R) Xeon(R) CPU E31230 @ 3.20GHz
>>           RAM: 32 Gb
>>
>>   * netperf: taken from https://github.com/HewlettPackard/netperf.git,
>> 	     compiled from sources with sctp support
>>   * netperf server and client are run on the same node
>>   * ip link set lo mtu 1500
>>
>> The script used to run tests:
>>  # cat run_tests.sh
>>  #!/bin/bash
>>
>> for test in SCTP_STREAM SCTP_STREAM_MANY SCTP_RR SCTP_RR_MANY; do
>>   echo "TEST: $test";
>>   for i in `seq 1 3`; do
>>     echo "Iteration: $i";
>>     set -x
>>     netperf -t $test -H localhost -p 22222 -S 200000,200000 -s 200000,200000 \
>>             -l 60 -- -m 1452;
>>     set +x
>>   done
>> done
>> ================================================
>>
>> Results (a bit reformatted to be more readable):
> ...
>
> Nice, good numbers.
>
> I'm missing some test that actually uses more than 1 stream. All tests
> in netperf uses only 1 stream. They can use 1 or Many associations on
> a socket, but not multiple streams. That means the numbers here show
> that we shouldn't see any regression on the more traditional uses, per
> Michael's reply on the other email, but it is not testing how it will
> behave if we go crazy and use the 64k streams (worst case).
>
> You'll need some other tool to test it. One idea is sctp_test, from
> lksctp-tools. Something like:
>
> Server side:
> 	./sctp_test -H 172.0.0.1 -P 22222 -l -d 0
> Client side:
> 	time ./sctp_test -H 172.0.0.1 -P 22221 \
> 		-h 172.0.0.1 -p 22222 -s \
> 		-c 1 -M 65535 -T -t 1 -x 100000 -d 0
>
> And then measure the difference on how long each test took. Can you
> get these too?
>
> Interesting that in my laptop just to start this test for the first
> time can took some *seconds*. Seems kernel had a hard time
> defragmenting the memory here. :)

No problem, will do those measurements as well.

Even more, to get the test results more repeatable, i think i make
the memory highly fragmented before the test. :)

Thank you!

--
Best regards,

Konstantin Khorenko,
Virtuozzo Linux Kernel Team