Messages in this thread | | | Date | Thu, 8 Aug 2002 12:19:22 +0000 (UTC) | From | Bruce M Beach <> | Subject | IDE numbers |
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Hello All
I'm just sending these numbers because they are interesting. I bought a couple of SCSI drives(seagate) a while ago so I thought I would try a simple performance test. I copied a 9.2Gb file (using G=1024^3) and timed it in the following manner:
1) Partition to Partition(IDE) hda1 to hda3 # wd drive 2) Partition to SCSI drive hda2 to sda1 # wd to seagate 3) SCSI drive to SCSI drive sda1 to sdb1 # seagate to seagate
and got the following numbers
time cp TEMP.tar ... hda3->hda1 49m18.320s ~ 3,339,200.9 bytes/s time cp TEMP.tar ... hdc1->sda1 51m16.493s time cp TEMP.tar ... sda1->scb1 5m41.388s ~ 28,936,063 bytes/s
At first I thought the IDE numbers were a little bit slow but thought the transfer must read and write the 9.2Gb so maybe I should double the rate and after all the 33 Mhz is just the IDE bus rate. I was suprised at the IDE -> SCSI transfer time except the the SCSI transport(adaptec) is on another PCI bus and maybe there is significant latency across the bridge. The real surprise was the SCSI -> SCSI and the ultimate result of this little experiment was that I bought 2 more SCSI drives.
I looked around a little bit to see if dmesg had anything to say and found the following lines:
... Real Time Clock Driver v1.10e Non-volatile memory driver v1.1 block: 128 slots per queue, batch=32 Uniform Multi-Platform E-IDE driver Revision: 6.31 ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx PCI_IDE: unknown IDE controller on PCI bus 00 device f9, VID=8086, DID=248b PCI: Device 00:1f.1 not available because of resource collisions PCI_IDE: chipset revision 2 PCI_IDE: not 100% native mode: will probe irqs later ide0: BM-DMA at 0xffa0-0xffa7, BIOS settings: hda:DMA, hdb:DMA ide1: BM-DMA at 0xffa8-0xffaf, BIOS settings: hdc:pio, hdd:pio hda: ST360021A, ATA DISK drive hdb: 16X10, ATAPI CD/DVD-ROM drive ide0 at 0x1f0-0x1f7,0x3f6 on irq 14 hda: 117231408 sectors (60022 MB) w/2048KiB Cache, CHS=7297/255/63 Partition check: /dev/ide/host0/bus0/target0/lun0: p1 p2 p3 ...
What 'PCI: Device 00:1f.1' is I couldn't determine except for a binary in /proc/bus/pci/00/1f.1. The PCI slots share resources across several bus's, (i.e. Slots 1 & 2 share with the SCSI trasport) and the only anomaly is that due to the onboard video having only 4Mb ram and there being no AGP slot, there is a PCI video card on bus 3. Please cc any comments to me.
Bruce `
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