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<== Date ==> <== Thread ==>

Subject: RE: Bandwidth limits in asyn
From: Iain Marcuson <Iain.Marcuson@sydorinstruments.com>
To: Mark Rivers <rivers@cars.uchicago.edu>, "tech-talk@aps.anl.gov >> EPICS Tech Talk" <tech-talk@aps.anl.gov>
Date: Thu, 20 Apr 2017 20:36:13 +0000
I am calling my own asynPortDriver function with the readInt16Array method.  This is 1 Gbit Ethernet.  On my most recent run, it took 0.854 seconds to receive 19214960 bytes.


> -----Original Message-----
> From: Mark Rivers [mailto:rivers@cars.uchicago.edu]
> Sent: Thursday, April 20, 2017 4:06 PM
> To: Iain Marcuson <Iain.Marcuson@sydorinstruments.com>; tech-
> talk@aps.anl.gov >> EPICS Tech Talk <tech-talk@aps.anl.gov>
> Subject: RE: Bandwidth limits in asyn
> 
> How are you reading the data, i.e. are you calling the drvAsynIPPort driver
> from your driver?
> 
> If so, how have you called drvAsynIPPortConfigure?  What value are you
> specifying for the timeout?
> 
> Is this 1 Gbit Ethernet?
> 
> What is the time between when you start the transfer and it breaks after
> 17640000 bytes?
> 
> Mark
> 
> 
> -----Original Message-----
> From: tech-talk-bounces@aps.anl.gov [mailto:tech-talk-
> bounces@aps.anl.gov] On Behalf Of Iain Marcuson
> Sent: Thursday, April 20, 2017 2:28 PM
> To: tech-talk@aps.anl.gov >> EPICS Tech Talk
> Subject: Bandwidth limits in asyn
> 
> I've been writing an asyn driver to receive data from a camera, but I seem to
> be hitting some sort of limit.  The total size to transmit is 35280000 bytes, but
> the connection breaks at around 17640000 bytes.  In a mockup test, I was
> able to transfer all the data by sending 16k with a pause of 0.5 seconds
> between each packet.  The receiving routine just buffers all the incoming
> data until it reads the predetermined amount.  Is there something else I
> need to be doing to get all the data?
> 
> Thank you,
> 
> Iain.

Replies:
RE: Bandwidth limits in asyn Mark Rivers
References:
Bandwidth limits in asyn Iain Marcuson
RE: Bandwidth limits in asyn Mark Rivers

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