Re: [uml-devel] uml responsivenes or "AS vs DEADLINE Scheduler on uml-host" - was: [uml-user] Network lags

[BlaisorBlade <blaisorblade_spam@yahoo.it>]

Alle 20:33, venerdì 9 aprile 2004, roland ha scritto:
> Hi !
> I think i found an interesting "scheduling issue" which led me to switch
> the subject of the thread.

1) Well, you switched from AS to deadline and got a significant IO performance 
improvement, which made UML faster since it was Disk-bound. The problem with 
AS is that it uses an heuristic, which assumes sequential reads.

But "find /" is very seeky, so it is slow with AS. So if you remove this bg 
thread, you should get significantly different results.

Also, AS has had some changes in later kernels, so you should probably upgrade 
your host kernel to the latest version. A security hole (a local exploit to 
become root) has also been fixed after 2.6.0.

2) In your last email, you speak about hogging the UML CPU. If Jeff guessed 
correctly what happens, then avoiding that UML is idle will decrease the 
worst-case ping response times.

-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729



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