[lm-sensors] dme1737 very slow read...

Juerg Haefliger juergh at gmail.com
Thu Jul 26 07:39:40 CEST 2007

Hi Eric,

> > Hi Eric,
> >
> >
> >> I was very happy to see dme1737 support added, thank you!  Now I can get
> >> all the info out of my compaq sr1710nx cheapo server.  :)
> >
> > Glad you like it :-) I can finally tell my wife that the time I spent
> > on the driver wasn't all wasted...
> I'm impressed; I tried to dislodge a data sheet for this chip from SMSC,
> with no luck.  They don't want us to know our cpu temps it seems!  ;-)

I only got it because the company I work for is under NDA with SMSC
even though I told them repeatedly that this is strictly for personal

> >> 1.53 seconds to read "0\n" !  :)
> >>
> >> Any idea if this is a hardware or software delay?  I haven't yet dug
> >> into profiling the kernel code to see what might be taking so long...
> >
> > It's simple: We have to read a lot of registers which we can only get
> > to via I2C which is veeerrrrryyyyy sloooooowwwwww.
> Ok, I thought it might be along those lines.  Is there any other
> performance impact to the system while it's waiting for the I2C bus?

Good question, I don't know. That's more a question for the I2C
mailing list. Jean?


> Thanks,
> -Eric

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