Date: Thu, 13 Sep 2001 15:48:36 +0200 From: Christoph Sold <so@i-clue.de> To: Matthias Bartels <mbartels@genie.de> Cc: "questions@freebsd.org" <questions@FreeBSD.ORG> Subject: Re: performance problem Message-ID: <3BA0B934.7070703@i-clue.de> References: <B3005733844@i01sv4107.ids1.intelonline.com>
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Matthias Bartels wrote: >Servus, > >i have a serious performance problem with my harddisk. >My Harddisk runs as U/DMA 100 with soft updates enabled. > >I used the time command to measure the time that FreeBSD needs to >extract the actual ports collection (13MB) and it takes over 13 min to >complete the task. But the user time was less then 1 second!!! > >i have the same problem while removing files. > >During the execution i used the top command and it figured out that >the priority is -2 and sometimes -6. is that normal??? > >the state always switched between getblk and biowr > >The CPU idle is near 99% > >could anybody help me? > I could confirm your times. Anyhow, this is hardware related. On U160 SCSI hard disks, this job runs significantly faster. (I am not providing timing information since the system I checked this was not taken out of production for those tests.) Conclusion: if you want server performance, choose server hardware. HTH -Christoph Sold To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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