From owner-freebsd-questions Sun Oct 24 15:53:52 1999 Delivered-To: freebsd-questions@freebsd.org Received: from sign.chg.ru (sign.chg.ru [193.233.46.10]) by hub.freebsd.org (Postfix) with ESMTP id 305411511B for ; Sun, 24 Oct 1999 15:53:48 -0700 (PDT) (envelope-from andrew@sign.chg.ru) Received: from localhost (andrew@localhost) by sign.chg.ru (8.9.3/8.9.3) with ESMTP id CAA07787; Mon, 25 Oct 1999 02:53:41 +0400 (MSD) (envelope-from andrew@sign.chg.ru) Date: Mon, 25 Oct 1999 02:53:41 +0400 (MSD) From: "Andrew L. Neporada" To: Kent Stewart Cc: freebsd-questions@FreeBSD.ORG Subject: Re: 3.3-STABLE : Performance problems?? In-Reply-To: <38138590.728CF896@3-cities.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG 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