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Date:      Sat, 27 Aug 2005 13:38:00 -0500
From:      Mark Kane <mark@mkproductions.org>
To:        Ariff Abdullah <skywizard@MyBSD.org.my>
Cc:        freebsd-questions@freebsd.org
Subject:   Re: Performance Issues with AMD64 3000+, 1.5GB RAM, FreeBSD 5.4-RELEASE
Message-ID:  <4310B308.1050202@mkproductions.org>
In-Reply-To: <43109A36.1050209@mkproductions.org>
References:  <430D3823.9070301@mkproductions.org>	<20050825160909.GB10134@slackbox.xs4all.nl>	<430DF015.5000203@mkproductions.org>	<20050825173758.GA10790@slackbox.xs4all.nl>	<430E0461.3030101@mkproductions.org>	<20050826174002.GA16044@xor.obsecurity.org>	<430F5C0B.3@mkproductions.org>	<20050827030750.6243acd9.skywizard@MyBSD.org.my>	<430F6AB1.2040306@mkproductions.org>	<20050827043808.03cbe4dd.skywizard@MyBSD.org.my> <43109A36.1050209@mkproductions.org>

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Mark Kane wrote:
> Ariff Abdullah wrote:
> 
>> These are my suggestions:
>> 1) enable 'options PREEMPTION'. This is a MUST.
>> 2) use SCHED_ULE instead of SCHED_4BSD. ULE is pretty stable on me,
>>    but I can't guarantee (especially combining with PREEMPTION).
>>    It doesn't hurt to give it a try.
>> 3) Apply these patches:
>>
>> http://staff.mybsd.org.my/skywizard/FreeBSD/sound/jroberson_flushbuf_RELENG_5.diff 
>>
>> http://staff.mybsd.org.my/skywizard/FreeBSD/sound/snd_RELENG_5_20050825_035.diff 
>>
> 
> 
> Well I added PREEMPTION to the kernel yesterday as well as the first 
> patch by Jeff Robertson. Immediately upon kernelinstall and reboot I 
> tried untarring Firefox and Thunderbird, as well as tarring them both 
> back up. Not a single skip, stutter, or freezing of the mouse/display!
> 
> I did more testing last night like listening to audio with downloads 
> open and encoding video, and I didn't hear one skip at all. The only 
> time I heard a little static was when I was burning a DVD and listening 
> to audio at the same time, but I can understand that.
> 
> Thanks to everyone who replied, this seems to be fixed for now. :)
> 
> -Mark

I do notice that when doing some things like using unrar to extract a 
file or loading a video into video encoding software I do get some of 
the same little crackles and static in the audio. I didn't notice this 
static/crackling ever before applying that first patch. I am still 
skip/stutter free though :).

Might the second patch help the crackling/static?

Thanks

-Mark




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