Re: Driver retries disk errors.

[Rogier Wolff]

On Wed, Sep 01, 2004 at 03:44:38PM +0100, Alan Cox wrote:
> On Mer, 2004-09-01 at 16:28, Romano Giannetti wrote:
> > Just a question from a kernel-almost-illiterate. Could this explain the
> > behavior of my laptop yesterday, reading a damaged DVD? I had to wait almost
> > one full minute of retry until being able to kill xine... 
> 
> Thats the block layer. Its actually hard to fix the kill -9 case.

I don't think so. It starts with the ide-cd level driver 
doing 8 retries. Most disk we see retry themselves for about  a 
4 second delay before reporting a bad block. A CD taking twice
that much would not sound abnormal. (seeks are about 10 times
as expensive on CDs). 8 times 8 seconds is a full minute. 

	Roger.  

-- 
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