Subject: st driver somehow blocking interrupts *way* too long.
To: None <>
From: Thor Lancelot Simon <>
List: tech-kern
Date: 05/24/2003 15:56:19
About a year ago I noticed that when backing up to DLT my main
fileserver's clock seemed to slip severely.  I assumed it was a
problem in the adw or isp drivers, hunted for it a bit, and
really found pretty much nothing.  I stopped using the fileserver
as an NTP server and didn't think much of it.

Now I'm sitting at home with a cheezy 5MB/sec SCSI DLT 2500 on
an ancient bha host adapter, trying to restore a tape of some
music files.  I'm noticing not only time slip but a steady stream
of "ohci0: one scheduling overruns".

I don't see anywhere obvious in the st or mid-layer code that
would block interrupts for a Long Time, but now I'm convinced
there must be some such problem.  Does anyone else see an
obvious suspect here?

 Thor Lancelot Simon	                            
   But as he knew no bad language, he had called him all the names of common
 objects that he could think of, and had screamed: "You lamp!  You towel!  You
 plate!" and so on.              --Sigmund Freud