Date: Mon, 25 Oct 1999 02:53:41 +0400 (MSD) From: "Andrew L. Neporada" <andrew@sign.chg.ru> To: Kent Stewart <kstewart@3-cities.com> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: 3.3-STABLE : Performance problems?? Message-ID: <Pine.BSF.4.10.9910250222110.7345-100000@sign.chg.ru> In-Reply-To: <38138590.728CF896@3-cities.com>
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On Sun, 24 Oct 1999, Kent Stewart wrote: > > > "Andrew L. Neporada" wrote: > > > > Hi All! > > For a long time I participate in one distributed computational project ( > > see http://www.mersenne.org for details). So I'am running a special > > program at low priority (nice=20), that utilizes all CPU power. > > After upgrading from 3.1-RELEASE to 3.3-STABLE I've noticed that average > > performance (averaging period is big enough to eliminate impact from > > other tasks ) of this programm is only 77% from measured > > performance on 3.1R and same hardware. I also notice some strange thing: > > top shows about 30% 'interrupt' at CPU states line. > > Maybe someone could help me to find out what happens? > > Any help would be greatly appreciated. > > I use IDE drives and I have to set the flags for my hardrives to > 0xa0ffa0ff after each cvsup and build world or upgrade. The default > GENERIC is changed and I re-create my kernel configuration file. This > doesn't apply if you have scsi drives but high IDE usage can cause a > significant increase in the interrupt rate if the 32-bit transfers, > DMA, and sector read ahead isn't specified. I also see a factor of 4 > faster transfer rate off of my IDE HD's after I boot with the flags > set. > > Kent > > > Andrew. Thank you, Kent. I'll try to rebuild kernel with this flags. But it seems unlikely that my IDE drives cause this disaster -- I haven't any significant disk usage during large periods of time ( I mean constant disk usage). So it is difficult for me to belive in this stuff. But anyway, thanks for your help. Andrew. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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