Date: Thu, 28 Jan 2010 20:15:20 +0100 From: Gary Jennejohn <gary.jennejohn@freenet.de> To: Randall Stewart <rrs@lakerest.net> Cc: FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: A strange thing with yesterday's head.. Message-ID: <20100128201520.6a114290@ernst.jennejohn.org> In-Reply-To: <B4F940BE-04BD-4ACC-B686-21D61423D236@lakerest.net> References: <B4F940BE-04BD-4ACC-B686-21D61423D236@lakerest.net>
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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
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