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command cache and io priority

Recently after configuring process scheduling priority and packet scheduling priority, i tested nice with simply tar -zxvf of gnusrc, i was amazed at what i assumed was a system that could take heavy load and still respond.

- operating systems that i know of seem to have a command cache, even under heavy disk io load. if one where to say commit 'uname -a' it would take perhaps 2 seconds to respond, though the next time it would respond fairly instantaneously. NetBSD does not seem to be doing that, the second go was just as slow; tested numerously

- despite this, i feel there would have to be an io scheduler in any adequate operating system. linux i found has 'ionice' as part of their cfq system so i'm assuming netbsd has this feature also, please correct me if i'm wrong.

this is a sun4u system


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