Re: [LAU] Netjack1, transport sync and tempo

From: Aurelien <tyranorl@email-addr-hidden>
Date: Mon Apr 26 2010 - 10:04:17 EEST

On Thu, Apr 15, 2010 at 07:50:12PM -1000, david wrote :
> Aurelien wrote:
> > On Fri, Apr 16, 2010 at 02:37:42AM +0200, torbenh wrote :
> >> On Thu, Apr 15, 2010 at 08:34:11AM +0200, Aurelien wrote:
> >>> Hello,
> >>>
> >>> I'm always hesitating between netjack1/2.
> >>>
> >>> Considering netjack1 and sync transport. I works fine, but I would like
> >>> the master to set the tempo for the slave(s), and it looks like netjack1
> >>> does not that (in the jackdmp version, at least). Am I wrong? Is there a
> >>> way to get the tempo from master to slave?
> >> no. you definitely need a transportmaster on the slave.
> >
> > OK.
> > This gives another point to netjack2!
> >
> > Concerning my problems with my network, it finally seems like both my
> > gigabit ethernet cards (Atheros Attansic L1) works in .... 10MB!!! That
> > should explain why I get these offset of 3 to 16 (!!!) cycles!
> >
> > It's weird, as the card is supported by the kernel, and lshw tells it
> > works at 1GB, but however, rate is around 10MB and lower.
>
> Hmmm - you don't happen to have your gigabit cards connected via a
> non-gigabit router/switch? Faster cards will usually happily connect at
> slower speeds if that's the best something along the way can do ...
>

No router, no switch, just two machines with the very same ethernet card
and distribution and kernel linked one to the other.
Actually, I've checked by monitoring network with iptraf. The result is
clear :
scp => transfer rate ~= 1Gb/s
netjack2 => transfer rate < 20Mb/s

-- 
Aurélien
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Received on Mon Apr 26 12:15:02 2010

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