netdev - Re: [PATCH v2 net-next 2/3] netem: add uapi to express delay and jitter in nanoseconds

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Message-ID: <1510180195.2849.113.camel@edumazet-glaptop3.roam.corp.google.com>
Date:   Wed, 08 Nov 2017 14:29:55 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Dave Taht <dave.taht@...il.com>
Cc:     netdev@...r.kernel.org, stephen@...workplumber.org
Subject: Re: [PATCH v2 net-next 2/3] netem: add uapi to express delay and
 jitter in nanoseconds

On Wed, 2017-11-08 at 13:09 -0800, Dave Taht wrote:
> netem userspace has long relied on a horrible /proc/net/psched hack
> to translate the current notion of "ticks" to nanoseconds.
> 
> Expressing latency and jitter instead, in well defined nanoseconds,
> increases the dynamic range of emulated delays and jitter in netem.
> 
> It will also ease a transition where reducing a tick to nsec
> equivalence would constrain the max delay in prior versions of
> netem to only 4.3 seconds.
> 
> Signed-off-by: Dave Taht <dave.taht@...il.com>
> ---

Suggested-by: Eric Dumazet <edumazet@...gle.com>
Reviewed-by: Eric Dumazet <edumazet@...gle.com>