Date: Fri, 12 Dec 2003 15:26:35 -0800 From: Scott Likens <damm@yazzy.org> To: Andy Fawcett <andy@athame.co.uk> Cc: current@freebsd.org Subject: Re: Observational notice... Message-ID: <1071271595.22946.1.camel@desolation.livid.de> In-Reply-To: <200312120925.42138.andy@athame.co.uk> References: <1071211621.8839.2.camel@desolation.livid.de> <200312120925.42138.andy@athame.co.uk>
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On Thu, 2003-12-11 at 23:25, Andy Fawcett wrote: > On Friday 12 December 2003 8:47 am, Scott Likens wrote: > > I've been observing my 5.2-RC box lately and it's running _ALOT_ > > slower then it has previously. > > > > It has no ACPI throttling support, and quite frankly this is annoying > > me, my ubench marks have gone down over 3000 points. > > > > Granted this is a SMP machine, with or without ULE (using 4BSD) it > > makes no difference. > > > > it's like a slug on wheels. > > > > Has anyone else observed this? or is this a unique situation? > > > > This is a dual P2-450 with 1gig of Ecc (Xeon processor's) > > > > It's not exactly the greatest thing on the market, but I need it to > > work properly and this isn't good. > > > > any hints? i've read the thread on acpi throttling, but I don't > > believe I fall into that catagory due to the age of the cpu. > > This sounds similar to what I was seeing on my P2-400 SMP box. > > Check "vmstat -i" to see if you have a massive amount of interrupts > going on (mine were on IRC20, at a rate of about 45K). > > I managed to "fix" this by applying the patch at > http://www.FreeBSD.org/~jhb/patches/acpi_irq.patch > and rebuilding/installing the kernel. No more spurious interrupts, and > performance is about the same as I used to have with 5.1R. > > I have no idea if this patch has any side-effects, so at the moment I am > treating it with extreme caution. > > Of course, your problem could be totally different, and all this from me > could be hot air :) > > A. After fiddling with the patches, it appears it's on the right track, but not the proper solution. By applying the patch, it even goes slower, by tweaking it some more, I get up 1/4 of the speed decrease. Not exactly the proper solution, But it's obvious it's related to the ACPI throttling code. Maybe anyone else has an idea or two? Scott -- "I think we ought to be out there doing what we do best - making large holes in other people's countries." - George Carlin
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