From: Jim Thompson <jim@netgate.com>
To: "Gary E. Miller" <gem@rellim.com>
Cc: "thumbgps-devel@lists.bufferbloat.net"
<thumbgps-devel@lists.bufferbloat.net>
Subject: Re: [Thumbgps-devel] Navisys GR-601W
Date: Mon, 24 Sep 2012 21:04:14 -0500 [thread overview]
Message-ID: <5140B6AE-C217-4494-952A-B30292F73902@netgate.com> (raw)
In-Reply-To: <20120924185826.610b061d.gem@rellim.com>
ntpd won't enable the PPS stuff, because the ioctl to 'discover' same fails.
covered on-list back in June/July
On Sep 24, 2012, at 8:58 PM, "Gary E. Miller" <gem@rellim.com> wrote:
> Yo Jim!
>
> On Mon, 24 Sep 2012 20:49:42 -0500
> Jim Thompson <jim@netgate.com> wrote:
>
>>
>> On Sep 24, 2012, at 5:32 PM, Gary E. Miller <gem@rellim.com> wrote:
>>
>>> Yo Jim!
>>>
>>> On Sun, 23 Sep 2012 00:07:43 -0500
>>> Jim Thompson <jim@netgate.com> wrote:
>>>
>>>> They don't work that we'll on FreeBSD.
>>>
>>> Really? First I've heard of it. What's the issue?
>>
>> In a word: jitter
>
> And how much jitter? The lack of RFC2783 should not be noticeable since
> the jitter on the USB serial is so large. RFC2783 helps in the
> micro Second range and the USB serial is in the milli Second range.
>
> So with, and without you are going to get about 1 milli Second jitter.
>
> So, what problem are you pointing up with *BSD?
>
>> Compare:
>> http://fxr.watson.org/fxr/source/dev/uart/uart_core.c?v=FREEBSD9
>> and
>> http://fxr.watson.org/fxr/source/dev/sio/sio.c?v=FREEBSD9
>> and
>> http://fxr.watson.org/fxr/source/pc98/cbus/sio.c?v=FREEBSD9
>>
>> to anything found in
>>
>> http://fxr.watson.org/fxr/source/dev/usb/serial/?v=FREEBSD9
>
> Not sure what you are trying to show me.
>
> RGDS
> GARY
> ---------------------------------------------------------------------------
> Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97701
> gem@rellim.com Tel:+1(541)382-8588
next prev parent reply other threads:[~2012-09-25 2:04 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-23 3:22 Joe Williams
2012-09-23 4:33 ` Eric S. Raymond
2012-09-23 5:07 ` Jim Thompson
2012-09-24 22:32 ` Gary E. Miller
2012-09-25 1:49 ` Jim Thompson
2012-09-25 1:58 ` Gary E. Miller
2012-09-25 2:04 ` Jim Thompson [this message]
2012-09-25 2:20 ` Gary E. Miller
2012-09-26 19:52 ` Joe Williams
2012-09-26 20:00 ` Gary E. Miller
2012-09-26 20:05 ` Dave Taht
2012-09-26 20:05 ` Joe Williams
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