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DateWed, 01 Oct 2003 14:09:43 +1000
FromNick Piggin <>
SubjectRe: 2.6.0-test6 scheduling(?) oddness
Nick Piggin wrote:

>>> Murray J. Root wrote:>>> P4 2G>> 1G PC2700 RAM>> ASUS P4S533>> Large tasks (like raytrace rendering) take double the amount of time 
>> they used>> to take, although the system is nicer to the user while they run. In 
>> 2.6.0-test5 had a little trouble with it and Piggin pointed me to a 
>> patch that>> fixed it and is now in -test6, however the patch didn't slow the 
>> rendering as>> much as it does in test6. (Con Koliva's patch, I believe it was).
>> For example - rendering an image that took 15 minutes in 2.5.65 takes 
>> 20 minutes in 2.6.0-test5 (with patch) and 30 minutes in 2.6.0-test6 
>> (raw from>> kernel.org). Same config options (everything I use builtin - no 
>> modules).>>>> A new issue (which also doesn't happen in -test5 with the patch):
>> When running cpu intense tasks, new (large) tasks will not start till 
>> the first>> one finishes.>> For example, using POV-Ray 3.5 to render an image that takes 30 
>> minutes when it>> is the only program running, start oowriter.>> The render finishes in the same 30 minutes, then oowriter starts.
>> oowriter takes about 3 seconds to load if no rendering is going on.
>> I can use apps that are already open but can't start new ones while 
>> rendering.>> In 2.6.0-test5 (with patch) opening oowriter while rendering takes 
>> about 1 minute.>> In 2.5.65 opening oowriter while rendering takes about 2 minutes (and 
>> X gets>> very hard to use till oowriter is completely done opening).
>>>> Hi Murray!> Con Kolivas' patch has been included in test6. You might have tried that
> or maybe my patch?>> Anyway, lets just clarify your report:> 1 CPU, hyperthreading on or off?>> test5 interactivity under load isn't as good as test6.
>> povray takes 150% more time in test6 vs tset5. How many compute threads
> does povray use? Is anything else running? 


Sorry, 150% _the_ time, 50% more time.

>>> oowriter takes 3 seconds to load when nothing is running
> oowriter takes 30(or more) minutes to load when povray is runnnig, takes
> 1 minute in test5 plus patch (could you tell us exactly what the patch
> is)>>

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