Boot poster challenge
Alan Cox
alan at redhat.com
Sun Nov 21 15:42:45 UTC 2004
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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