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Date: Thu, 1 Aug 2002 10:58:29 +0200
From: Jens Axboe <axboe@suse.de>
To: Andrew Morton <akpm@zip.com.au>
Cc: Marcelo Tosatti <marcelo@conectiva.com.br>,
       lkml <linux-kernel@vger.kernel.org>
Subject: Re: Linux v2.4.19-rc5
Message-ID: <20020801085829.GD1096@suse.de>
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On Thu, Aug 01 2002, Andrew Morton wrote:
> Jens Axboe wrote:
> > 
> > ...
> > > Anyway, lets wait for the numbers.
> > 
> > It just 'feels' like the sort of change that might have odd side
> > effects.
> 
> It's almost impossible to get READA to do anything.  For example, in
> current 2.5, if a READA attempt is actually aborted, end_buffer_io_sync
> reports a "buffer I/O error".  Every time. And nobody has reported this.

Ahem, I've actually seen that happen :-). But maybe a total of 20 times
or so.

> It _is_ possible to hit this in 2.5, because of ext2_preread_inode().
> 
> Probably, also it's possible to hit it in 2.4 with hundreds of processes
> all issuing ext3 directory readahead.  But it's pretty remote.

Alright, I'm happy then.

-- 
Jens Axboe

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