> The problem is that at the low point in the cycle, the machine is
> unusable. It is utterly unresponsive until the writes complete, which can
> take a very long time (in the case of the ppc machine, several minutes!)
> Anything that does disk I/O will block for a long time - having 'ls' take
>
On Mon, 16 Apr 2001, Pavel Machek wrote:
> Hi!
>
> > It also seems that in the 2.4 kernels, we can get into a sort of
> > oscillation mode, where we can have long periods of disk activity
> > where nothing can get done - the low points, where only 2-3 writes
> > per second can occur, so completel
Hi!
> It also seems that in the 2.4 kernels, we can get into a sort of
> oscillation mode, where we can have long periods of disk activity
> where nothing can get done - the low points, where only 2-3 writes
> per second can occur, so completely screw up the interactive
> performance that you sim
Subject: Oscillations in disk write compaction
The following data sets are the output of a small program that
reads a random 4k block from a large data file, makes a trivial
alteration to the block, and writes the block back into the
file (in place). In all three cases the file is larger than
t
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