From: "Sørensen, Stefan" <Stefan.Sorensen@spectralink.com>
To: "richardcochran@gmail.com" <richardcochran@gmail.com>
Cc: "davem@davemloft.net" <davem@davemloft.net>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>
Subject: Re: [PATCH net-next 2/5] dp83640: Delay scheduled work.
Date: Mon, 2 Nov 2015 07:23:12 +0000 [thread overview]
Message-ID: <1446448990.2437.7.camel@spectralink.com> (raw)
In-Reply-To: <20151030203729.GC27879@netboy>
On Fri, 2015-10-30 at 21:37 +0100, Richard Cochran wrote:
>
> NAK. We want to have the time stamp ASAP, because the delay between
> the transmission of the Sync and its application in the servo
> degrades or even spoils synchronization. Think of an ARM SoC with
> HZ=100. Two jiffies are 20 milliseconds.
The workqueue is only used for delivering packets where the timestamp
was lost - if a timestamp is received, the packet is delivered
immediately. This patch may introduce a slight delay of the packets
where the timestamp never arrives, by these packets are properly not
very useful to the application anyway.
Stefan
next prev parent reply other threads:[~2015-11-02 7:38 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-30 12:13 [PATCH net-next 0/5] dp83640 driver fixes Stefan Sørensen
2015-10-30 12:14 ` [PATCH net-next 1/5] dp83640: Include hash in timestamp/packet matching Stefan Sørensen
2015-10-30 20:32 ` Richard Cochran
2015-10-30 12:14 ` [PATCH net-next 2/5] dp83640: Delay scheduled work Stefan Sørensen
2015-10-30 20:37 ` Richard Cochran
2015-11-02 7:23 ` Sørensen, Stefan [this message]
2015-11-02 9:59 ` Richard Cochran
2015-10-30 12:14 ` [PATCH net-next 3/5] dp83640: Prune rx timestamp list before reading from it Stefan Sørensen
2015-10-30 20:38 ` Richard Cochran
2015-10-30 12:14 ` [PATCH net-next 4/5] ptp: Change ptp_class to a proper bitmask Stefan Sørensen
2015-10-30 20:39 ` Richard Cochran
2015-10-30 12:14 ` [PATCH net-next 5/5] dp83640: Only wait for timestamps for packets with timestamping enabled Stefan Sørensen
2015-10-30 20:40 ` Richard Cochran
2015-11-02 20:13 ` [PATCH net-next 0/5] dp83640 driver fixes David Miller
2015-11-03 8:42 ` Richard Cochran
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