"DBus Embedded" - a clean break

[Thiago Macieira]

On Thursday, 20 de January de 2011 18:42:29 Kees Jongenburger wrote:
> Hi,
> 
> On Thu, Jan 20, 2011 at 1:18 PM, Rob Taylor <rob.taylor at codethink.co.uk> 
wrote:
> > On 20/01/11 13:47, Thiago Macieira wrote:
> > 
> > On Thursday, 20 de January de 2011 10:09:00 Rob Taylor wrote:
> > 
> > P.S.  Context for those not involved in embedded systems: consider that
> > I generally estimate send->receive time of 30ms for a single dbus
> > message going via the bus on capable ARM systems. That means the time
> > for 10 IPC calls is a human-visible time.
> > 
> > My benchmarks on the N900 produce 4 to 5 ms for the roundtrip.
> > 
> > That's not just me either:
> > http://permalink.gmane.org/gmane.comp.freedesktop.dbus/10252
> > 
> > 
> > Good stuff, I've obviously been being too pessimistic! Are your bench
> > marks measuring different message sizes and processor loads?
> 
> That test focuses on latency (not much data is sent over the bus) to
> perhaps this explains some differences?

See my other reply. The problem that everyone complains is latency, not the 
data throughput.

My experiences show that data throughput is not a problem. Just send more data 
in each message. The problem is the big overhead in handling each message.

-- 
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
  Senior Product Manager - Nokia, Qt Development Frameworks
      PGP/GPG: 0x6EF45358; fingerprint:
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