From quozl at us.netrek.org  Thu Mar  8 22:33:02 2018
From: quozl at us.netrek.org (James Cameron)
Date: Fri, 9 Mar 2018 15:33:02 +1100
Subject: [netrek-dev] Time based packet transmission
Message-ID: <20180309043302.GB2818@us.netrek.org>

New feature for Linux kernel may be used to more accurately pace
packets sent from Netrek server to client.

https://lwn.net/Articles/748744/

At the moment packet timing has jitter because it is implemented in
user space.

-- 
James Cameron
http://quozl.netrek.org/

From netrek at gmail.com  Fri Mar  9 22:06:31 2018
From: netrek at gmail.com (Zachary Uram)
Date: Fri, 9 Mar 2018 23:06:31 -0500
Subject: [netrek-dev] Time based packet transmission
In-Reply-To: <20180309043302.GB2818@us.netrek.org>
References: <20180309043302.GB2818@us.netrek.org>
Message-ID: <CAPu6UvBKJm8bNb6U86PfiMQndFOKQEgKDLgmCm3EZtxpBTkP4A@mail.gmail.com>

On Thu, Mar 8, 2018 at 11:33 PM, James Cameron <quozl at us.netrek.org> wrote:

> New feature for Linux kernel may be used to more accurately pace
> packets sent from Netrek server to client.
>
> https://lwn.net/Articles/748744/
>
> At the moment packet timing has jitter because it is implemented in
> user space.
>

Cool.

Zach

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From sven-netrek-dev at sven.de  Thu Mar 15 03:56:55 2018
From: sven-netrek-dev at sven.de (Sven Neuhaus)
Date: Thu, 15 Mar 2018 09:56:55 +0100
Subject: [netrek-dev] Time based packet transmission
In-Reply-To: <20180309043302.GB2818@us.netrek.org>
References: <20180309043302.GB2818@us.netrek.org>
Message-ID: <0dd62a8f-dc80-837c-756f-26f66a23f764@sven.de>

Am 09.03.2018 um 05:33 schrieb James Cameron:
> New feature for Linux kernel may be used to more accurately pace
> packets sent from Netrek server to client.
> 
> https://lwn.net/Articles/748744/
> 
> At the moment packet timing has jitter because it is implemented in
> user space.

Interesting.
However, do you think it's worth it? Have you measured the jitter?

My guess is that it's less than 1ms unless the server and/or its network
interfaces is/are under considerable load.

Also delaying the packet just to reduce the jitter would make them
stale, wouldn't it?
Dropping a packet when it couldn't be sent in time doesn't sound very
appealing either.

-Sven