Date: Sun, 1 Nov 1998 05:09:49 +0200 From: Vallo Kallaste <vallo@matti.ee> To: freebsd-scsi@FreeBSD.ORG Subject: AIC-7895 and 20.0MB/s transfers Message-ID: <19981101050949.A291@matti.ee>
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I purchased new motherboard recently which have onboard AIC-7895P chip. All is well but dmesg says that I have 20MB/s transfers only. When working with old ncr controller I have 40MB/s transfers. Some bits from dmesg: ahc0: <Adaptec aic7895 Ultra SCSI adapter> rev 0x04 int a irq 16 on pci0.18.0 ahc0: aic7895 Wide Channel A, SCSI Id=7, 16/255 SCBs Freeing (NOT implemented) redirected ISA irq 10. ahc1: <Adaptec aic7895 Ultra SCSI adapter> rev 0x04 int b irq 16 on pci0.18.1 ahc1: aic7895 Wide Channel B, SCSI Id=7, 16/255 SCBs Freeing (NOT implemented) redirected ISA irq 10. ncr0: <ncr 53c875 fast20 wide scsi> rev 0x03 int a irq 16 on pci0.19.0 changing root device to da0s1a da0 at ahc0 bus 0 target 6 lun 0 da0: <QUANTUM VIKING II 4.5WSE 5520> Fixed Direct Access SCSI2 device da0: 20.0MB/s transfers (10.0MHz, offset 8, 16bit), Tagged Queueing Enabled da0: 4350MB (8910423 512 byte sectors: 255H 63S/T 554C) da1 at ahc1 bus 0 target 6 lun 0 da1: <QUANTUM VIKING II 4.5WSE 5520> Fixed Direct Access SCSI2 device da1: 20.0MB/s transfers (10.0MHz, offset 8, 16bit), Tagged Queueing Enabled da1: 4350MB (8910423 512 byte sectors: 255H 63S/T 554C) cd0 at ncr0 bus 0 target 0 lun 0 cd0: <TOSHIBA CD-ROM XM-6201TA 1030> Removable CD-ROM SCSI2 device cd0: 10.0MB/s transfers (10.0MHz, offset 16) cd0: Attempt to query device size failed: NOT READY, Medium not present I feel that this issue was discussed lately somewhere but I'm not sure. What I can do to get back faster transfers ? Vallo Kallaste vallo@matti.ee To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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