Re: nicksched v30

[Nick Piggin <piggin@cyberone.com.au>]

Prakash K. Cheemplavam wrote:

> Nick Piggin wrote:
>
>> http://www.kerneltrap.org/~npiggin/v30.gz
>>
>> Applies to kernel 2.6.4-rc1-mm2.
>> Run X at about nice -10 or -15.
>> Please report interactivity problems with the default scheduler
>> before using this one etc etc.
>
>
> So far i noticed:
>
> with default scheduler:
>
> When I run emerge sync (I am on gentoo) and finally the cache on disk 
> gets updated (very heavy disk activity), default scheduler (in 
> conjunction with cfq, haven' tried other) causes a schmall pause of 
> 1-2 seconds when I use my browser, ie mouse cursor is ok, but I cannot 
> scroll for that time.
>

Probably just reading stuff in.

> your scheduler: I tried it with the "love-sources", so maybe that 
> patch "steel300" incorporated was already a bit outdated, but I dunno. 
> It had the same version as above.  When I click on a link in 
> thunderbird and it opens up in firefox (is started and just a new tab 
> is created) the mouses stutters for a brief moment. This didn't happen 
> with default scheduler. I dunno if above sympton happens with yours.
>
> I haven't reniced X withy our patch. But I did it once and I didn't 
> see much of a difference. (I dunno if the mouse stutter went away 
> then...)
>

If you don't renice X then it doesn't get any special treatment and
interactivity is generally worse. It makes a very big difference here
when I run X at -15.