ULE/yielding patch for testing.
Kris Kennaway
kris at FreeBSD.org
Sat Oct 6 05:58:18 PDT 2007
Benjamin Close wrote:
> 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?
I assume you checked whether you are touching swap.
Kris
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