netdev - Re: Flaw in "random32: update the net random state on interrupt and activity"

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Message-ID: <CA+icZUVa2wuWB-Mk0FW=1GX27ai2mk74aTnF8b1eRcRbXJwDUg@mail.gmail.com>
Date:   Wed, 12 Aug 2020 09:13:26 +0200
From:   Sedat Dilek <sedat.dilek@...il.com>
To:     Eric Dumazet <edumazet@...gle.com>
Cc:     netdev@...r.kernel.org
Subject: Re: Flaw in "random32: update the net random state on interrupt and activity"

On Wed, Aug 12, 2020 at 8:35 AM Sedat Dilek <sedat.dilek@...il.com> wrote:
>
> [ INSTRUCTIONS ]
>
> echo 1 > /proc/sys/kernel/sched_schedstats
> echo prandom_u32 >> /sys/kernel/debug/tracing/set_event
> echo traceon > /sys/kernel/debug/tracing/events/random/prandom_u32/trigger
> echo 1 > /sys/kernel/debug/tracing/events/enable
>
> /home/dileks/bin/perf record -e random:prandom_u32 -a -g -- sleep 10
>
> That gives me now some perf data.
>

I perf-probed for tcp_v4_connect:

/home/dileks/bin/perf probe --add tcp_v4_connect

/home/dileks/bin/perf list | grep probe:
  probe:tcp_v4_connect                               [Tracepoint event]

/home/dileks/bin/perf record -e probe:tcp_v4_connect -a -g -- sleep 10

/home/dileks/bin/perf record -e
probe:tcp_v4_connect,random:prandom_u32 -a -g -- sleep 10

/home/dileks/bin/perf report --stdio

- Sedat -