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Re: Boot poster challenge



On Sat, Nov 20, 2004 at 11:50:49PM +0100, Ziga Mahkovec wrote:
> This chart includes data from iostat (sysstat package).  Notice how the
> disk is fully utilized (%util) during readahead, but the throughput
> (rkB/s) is *really* low.  This could very well be a problem with my hard
> disk.  hdparm seems fine though (and I checked the parameters before
> running readahead).

Disks are very very seek constrained. You get wonderful performance reading
linear data. The moment you read a lot of scattered files or a file with a
lot of segments you will get low performance - even more so on laptops than
desktops


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