dme1737 very slow read...

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Juerg Haefliger wrote:
> 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!  ;-)

>> 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?

Thanks,

-Eric




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