netdev - Re: [PATCH v4 net-next 00/19] inet: frags: bring rhashtables to IP defrag

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Date:   Wed, 30 May 2018 06:56:01 -0400
From:   Eric Dumazet <edumazet@...gle.com>
To:     Jesper Dangaard Brouer <brouer@...hat.com>
Cc:     Eric Dumazet <eric.dumazet@...il.com>, aring@...atatu.com,
        Tariq Toukan <tariqt@...lanox.com>,
        David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>, Florian Westphal <fw@...len.de>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Thomas Graf <tgraf@...g.ch>,
        Alexander Aring <alex.aring@...il.com>,
        Stefan Schmidt <stefan@....samsung.com>,
        Kirill Tkhai <ktkhai@...tuozzo.com>, moshe@...lanox.com,
        Eran Ben Elisha <eranbe@...lanox.com>,
        Rick Jones <rick.jones2@....com>
Subject: Re: [PATCH v4 net-next 00/19] inet: frags: bring rhashtables to IP defrag

On Wed, May 30, 2018 at 6:36 AM Eric Dumazet <edumazet@...gle.com> wrote:


> Here are the good ones, using latest David Miller net tree. ( plus
> https://patchwork.ozlabs.org/patch/922528/  but that should not matter
here)

> llpaa23:/export/hda3/google/edumazet# ./netperf -H 2607:f8b0:8099:e18:: -t
> UDP_STREAM
> MIGRATED UDP STREAM TEST from ::0 (::) port 0 AF_INET6 to
> 2607:f8b0:8099:e18:: () port 0 AF_INET6
> Socket  Message  Elapsed      Messages
> Size    Size     Time         Okay Errors   Throughput
> bytes   bytes    secs            #      #   10^6bits/sec

> 212992   65507   10.00      216236      0    11331.89
> 212992           10.00      215068           11270.68


> There are few drops because of the too small
> /proc/sys/net/core/rmem_default  ( 212992 as seen in netperf output) for
> these kind of stress.
> ( each 64KB datagram actually consumes half the budget ...)


Once rmem_default is set to 1,000,000 and  mtu set back to 1500 (instead of
5102 on my testbed)
results are indeed better.

lpaa23:/export/hda3/google/edumazet# ./netperf -H 2607:f8b0:8099:e18:: -t
UDP_STREAM -l 10
MIGRATED UDP STREAM TEST from ::0 (::) port 0 AF_INET6 to
2607:f8b0:8099:e18:: () port 0 AF_INET6
Socket  Message  Elapsed      Messages
Size    Size     Time         Okay Errors   Throughput
bytes   bytes    secs            #      #   10^6bits/sec

212992   65507   10.00      231457      0    12129.56
1000000           10.00      231457           12129.56