Date: Fri, 12 Dec 2003 09:25:42 +0200 From: Andy Fawcett <andy@athame.co.uk> To: Scott Likens <damm@yazzy.org>, current@freebsd.org Subject: Re: Observational notice... Message-ID: <200312120925.42138.andy@athame.co.uk> In-Reply-To: <1071211621.8839.2.camel@desolation.livid.de> References: <1071211621.8839.2.camel@desolation.livid.de>
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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. -- Andy Fawcett | andy@athame.co.uk | tap@kde.org "In an open world without walls and fences, | tap@lspace.org we wouldn't need Windows and Gates." -- anon | tap@fruitsalad.org
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