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SubjectRe: [PATCH] proposed scheduler enhancements and fixes

On Sun, 27 Feb 2000, Andrea Arcangeli wrote:

> Where can I find dbench? It would be interesting for me to see at least
> the kind of workload that it generates on the machine. Also which
> blockdevice are you using?

you can find Andrew Tridgell's dbench at:

ftp://samba.org/pub/tridge/dbench/

> Just another idea: another thing that may make a difference are the
> smp scheduler changes I did in the latest 2.3.4x. You can try to
> backout this patch:

this could explain the lat_ctx slowdown. The 2.3.43 idle-selection changes
are trivial enough but getting idle thread selection right can be tricky.
Just getting 'good feedback' is not enough when changing the scheduler,
lat_ctx and other micro-benchmarks are important and depend on scheduling
heavily. Could you check wether your patch causes the lat_ctx slowdown
Dimitris noticed?

i believe we have two problems and they are unrelated: lat_ctx
micro-slowdown and IO performance slowdown.

-- mingo


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