Ralph,
> I was already reporting this problem some months ago
I dont see an entry in Mantis for this so I took the liberty of
creating one.
Jeff
> -----Original Message-----
> From: Ralph Lange [mailto:[email protected]]
> Sent: Friday, March 04, 2005 3:34 PM
> To: Rolf Keitel
> Cc: tech_talk
> Subject: Re: dm and edm problems with CA gateway
>
>
> Hi Rolf,
>
> we have seen the same problems with the V2.0 Gateway running
> on Linux. I
> was able to cut it down to a small Linux system with just one
analog
> record running on a soft IOC and a Gateway running on the
> same machine
> exporting this channel on a different port number. Starting
> camonitor on
> a different host to directly watch the channel on the IOC I
> was able to
> see random junk values being written into the channel as soon
as two
> clients are writing fast (slider) through the Gateway. Not just
jumps
> (that I'd expect), but really random bit patterns that are
> interpreted
> as doubles. No matter which system the clients run on (tested
with HP
> and Linux). Connecting the clients directly to the soft IOC -
> no problem.
>
> At BESSY it didn't kill hardware as our DRVHs are set properly
... I
> hope. We lost the beam a couple of times until - as an
> instant measure -
> we stopped running write accesses through the Gateway. Read
accesses
> seem to work fine.
>
> The V1 Gateway does not show this behaviour - but we had to
> switch to V2
> because the old hardware died.
>
> I was already reporting this problem some months ago, but the
APS
> installation hardly uses write access through the Gateway (if
> at all),
> so Ken doesn't see these problems - which makes it hard
> finding the bugs
> as well as the motivation to fix them. But again: One Linux
> box running
> one ao channel on a soft IOC, the Gateway, the camonitor, and
> two simple
> clients is enough to reproduce the problem. (On my RH8 Linux
> box, at least.)
>
> Hope this helps (well, I know it doesn't really, but ...;-)
> Ralph
>
>
> Rolf Keitel wrote:
>
> > **** Has anybody else experienced these problems? ****
> >
> > When we are operating sliders to write process variables
> through the
> > CA gateway, every now and then on releasing the sliders the
gateway
> > writes huge (and I mean r e a l l y huge positive or
negative)
> > numbers to the IOC, which set the PV to the upper or lower
> end of the
> > allowed range.
> > This never happens if you don't use the gateway.
> >
> > We observed this behaviour both with dm and with edm (running
on
> > Solaris or Linux Redhat 9).
> > The gateway is running on a Linux (Redhat 9) box. Several
gateway
> > releases up to Beta18 (built against EPICS R3.14.6) exhibit
this
> > behaviour.
> >
> > We lost a couple of devices, where a user hadn't specified a
proper
> > DRVH for the setpoint.
> > We have taken the gateway out of operation until this is
resolved.
> >
> > - rolf -
> >
>
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- Re: dm and edm problems with CA gateway Ralph Lange
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