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Date:      Thu, 28 Jan 2010 13:55:21 -0800
From:      Randall Stewart <rrs@lakerest.net>
To:        gary.jennejohn@freenet.de
Cc:        FreeBSD Current <freebsd-current@freebsd.org>
Subject:   Re: A strange thing with yesterday's head..
Message-ID:  <117532D7-75B9-4BE8-A8B6-0A6761064B92@lakerest.net>
In-Reply-To: <20100128201520.6a114290@ernst.jennejohn.org>
References:  <B4F940BE-04BD-4ACC-B686-21D61423D236@lakerest.net> <20100128201520.6a114290@ernst.jennejohn.org>

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I was running SCHED_ULE on an 8.0 and everything works
fine.

On my 2 core head of yesterday I tried both SCHED_ULE AND
4BSD.. and got the same results ;-0

I will try my 4 core when I get home ;-)

R
On Jan 28, 2010, at 11:15 AM, Gary Jennejohn wrote:

> On Thu, 28 Jan 2010 10:30:37 -0800
> Randall Stewart <rrs@lakerest.net> wrote:
>
>> All:
>>
>> I just found a very strange thing with yesterdays head.
>>
>> The program
>>
>> http://www.freebsd.org/~rrs/my_thr.c
>>
>> I compile it:
>>
>> cc -g -o my_thr my_thr.c /usr/lib/libthr.a -lpthread
>>
>> Now when you run this on a 2 core 64 bit machine running X11 with
>> yesterday
>> AM's current. The machine appears to lock completely. It really has
>> not give
>> it time and it will chug along.. but the mouse disappears etc... as  
>> if
>> its locked.
>>
>> It takes quite some time to complete .. and every now and then a
>> hickup will occur
>> and you get a slight response..
>>
>> Now I took this code home and ran it on my 4core AMD (2.8Gig with  
>> real
>> AMD cores). And
>> it did NOT do the same.. but ran like you would expect it to.
>>
>> I then took the same code running on an identical 8.0 release machine
>> and ran it
>> and it worked like you would expect..
>>
>>
>> It looks like some change in the scheduler in head is not doing good
>> things.
>>
>> Note my 4 core is behind the 2 core.. so it may not be core count
>> related.. when
>> I get off work today and get home I will do a update and see if the 4
>> core starts
>> behaving badly too...
>>
>
> Are you using SCHED_4BSD?  Seems to me some changes were made to it
> very recently.
>
> I tried this on my AMD64 X2 using SCHED_ULE and it worked OK.  But I'm
> not running HEAD, because I'm using the svn tree with soft-updates
> journaling from a few days ago.
>
> ---
> Gary Jennejohn
>

------------------------------
Randall Stewart
803-317-4952 (cell)
803-345-0391(direct)




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