Re: ULE/yielding patch for testing.

From: Benjamin Close <Benjamin.Close_at_clearchain.com>
Date: Sat, 06 Oct 2007 21:32:25 +0930
Marc Fonvieille wrote:
> On Sat, Oct 06, 2007 at 09:44:29AM +0200, Marc Fonvieille wrote:
>   
>> On Tue, Oct 02, 2007 at 04:53:33PM -0700, Jeff Roberson wrote:
>>     
>>> Enclosed is a patch that does two things:
>>>
>>> 1)  Reduces UP context switch time by over 10% making it faster than 4BSD 
>>> on UP.  On SMP it's hard to compare since ULE can do as many as 30x as many 
>>> switches per second on my 8way system.
>>>
>>> 2)  Restores old sched_yield() behavior from 6.x.  This was changed in 
>>> -current unintentionally I think.
>>>
>>> I'd appreciate any extra testing.  The ULE context switch time improvements 
>>> required some changes to the frequency that we recalculate priorities.  I'm 
>>> mostly interested in hearing whether this causes any regression in normal 
>>> workloads.
>>>
>>>       
>> [tested with _ULE]
>>
>> This seems to help a bit the things for me (desktop use during
>> compilations).  But 6.X is still faster, i.e, less lags and less jerky
>> mouse movements during port builds.
>> Thanks for spending time improving things, I really appreciate it.
>>
>>     
>
> After more testing, the lag problem is caused by the use of firefox.
> Once I try to open a heavy webpage, both firefox and Xorg become slow,
> the rest is fine.  By the "rest" I mean: audacious playing mp3s, wget and
> ncftp downloading huge (100MB) files, compiling wine and aMule running.
>   
I find the lag occuring with the 4BSD scheduler as well. dailytech.com 
is a particularly good site at lagging the system (though a great website).
Perhaps this isn't scheduler related?

Cheers,
    Benjamin
Received on Sat Oct 06 2007 - 10:18:09 UTC

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