Date: Sat, 06 Oct 2007 21:32:25 +0930 From: Benjamin Close <Benjamin.Close@clearchain.com> To: Marc Fonvieille <blackend@freebsd.org> Cc: Jeff Roberson <jroberson@chesapeake.net>, current@freebsd.org Subject: Re: ULE/yielding patch for testing. Message-ID: <47077951.5030906@clearchain.com> In-Reply-To: <20071006102113.GC976@gothic.blackend.org> References: <20071002165007.D587@10.0.0.1> <20071006074429.GB976@gothic.blackend.org> <20071006102113.GC976@gothic.blackend.org>
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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
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