Subject: Re: st driver somehow blocking interrupts *way* too long.
To: Thor Lancelot Simon <>
From: Matthew Jacob <>
List: tech-kern
Date: 05/26/2003 21:26:26
What's the underlying SCSI hba?

On Sat, 24 May 2003, Thor Lancelot Simon wrote:

> 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