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On guts and I/O schedulers
Posted by: Edwin DeSouza
Date: December 13, 2007 01:03PM

On guts and I/O schedulers

Benchmarks and guts sometimes may contradict each other. Like, a benchmark tells that “performance difference is not big”, but guts do tell otherwise (something like “OH YEAH URGHH”). I was wondering why some servers are much faster than other, and apparently different kernels had different I/O schedulers. Setting ‘deadline’ (Ubuntu Server default) makes miracles over having ‘cfq’ (Fedora, and probably Ubuntu standard kernel default) on our traditional workload.

Now all we need is showing some numbers, to please gut-based thinking (though it is always pleased anyway):

http://dammit.lt/2007/12/13/io-scheduler-deadline-cfq/

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On guts and I/O schedulers
December 13, 2007 01:03PM


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