Date: Thu, 6 Nov 2003 14:31:36 +0100
From: Jens Axboe <axboe@suse.de>
To: "Prakash K. Cheemplavam" <prakashpublic@gmx.de>
Cc: Nick Piggin <piggin@cyberone.com.au>, linux-kernel@vger.kernel.org
Subject: Re: 2.9test9-mm1 and DAO ATAPI cd-burning corrupt
Message-ID: <20031106133136.GA477@suse.de>
References: <3FA945DD.8030105@gmx.de> <20031106091746.GA1379@suse.de> <3FAA41C3.9060601@gmx.de> <3FAA45A9.20707@cyberone.com.au> <20031106130030.GC1145@suse.de> <3FAA4737.3060906@cyberone.com.au> <20031106130553.GD1145@suse.de> <3FAA4880.8090600@cyberone.com.au> <20031106131141.GE1145@suse.de> <3FAA4D48.6040709@gmx.de>
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On Thu, Nov 06 2003, Prakash K. Cheemplavam wrote:
> Jens Axboe wrote:
> >On Fri, Nov 07 2003, Nick Piggin wrote:
> >
> >>
> >>Jens Axboe wrote:
> >>
> >>
> >>>On Fri, Nov 07 2003, Nick Piggin wrote:
> >>>
> >>>
> >>>>Jens Axboe wrote:
> >>>>
> >>>>
> >>>>
> >>>>>sys time is usually pretty high if that is the case, and it's hovering
> >>>>>around 5% here... Prakash, are you sure that dma is enabled on the
> >>>>>drive? When you see the problem, do a vmstat 1 for 10 seconds so you 
> >>>>>are
> >>>>>absolutely sure you are sending the info from when the problem occurs.
> >>>>>
> >>>>>
> >>>>
> >>>>Although have a look at the interrupts field in vmstat 1255, 725, 736 
> >>>>...
> >>>>
> >>>
> >>>Yeah that is pretty high for just doing a burn, maybe something else is
> >>>
> >>
> >>;) you are forgetting 2.6 should give 1000 timer interrupts per second!
> >
> >
> >Heh indeed, maybe because the archs I use are still at 100. Looks
> >suspiciously like it's loosing timer interrupts, which would indeed
> >point to PIO.
> >
> bash-2.05b# hdparm -I /dev/hdc

-i please

> Is it normal that SCSI subsystem gets init'ed, even though nothing of it 
> is activated in the kernel?

No, you still have it left in your kernel options.

-- 
Jens Axboe

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