Date: Fri, 21 Apr 2000 14:58:15 +0400 From: "Artem Koutchine" <matrix@chat.ru> To: <questions@freebsd.org> Subject: SCSI vs UDMA IDE 32-bit Message-ID: <003601bfab80$82823c40$0c00a8c0@ipform.ru>
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I've made a little test. I took a bunch of files (~130 MB) and copied them from one filessystem to another. The HDD is IDE Quantum FB 10GB. While copying i run top and saw about 80% of cpu wasted on interupts. Then i anables 32bit access for the hdd and turned on DMA transfers. Repeated the test and saw only tiny 0.8% wasted on interupts, which is comparable to what SCSI takes. So, knowing that SCSI and IDE hdd are based on the same mechanical parts why should even use SCSI? Am I missing something? Artem To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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