Date: 31 Aug 1999 13:44:03 -0400 From: Kevin Street <street@iname.com> To: Soren Schmidt <sos@freebsd.dk> Cc: current@FreeBSD.ORG Subject: Re: HEADS UP! ATA driver (atapi DMA).. Message-ID: <87btbnetgc.fsf@mired.eh.local> In-Reply-To: Soren Schmidt's message of "Tue, 31 Aug 1999 14:13:16 %2B0200 (CEST)" References: <199908311213.OAA80049@freebsd.dk>
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Two things I've noticed: 1) my cdrom delivers about 2M/s which is the same as before DMA. Is the improvement only in cpu usage or should I be seeing a speed improvement too? speed tested with: dd if=/dev/racd0c of=/dev/null bs=64k count=320 (I get it to spin up with another dd before this test) 2) I can crash my system (sometimes a panic, sometimes a freeze) with: dd if=/dev/racd0c of=/dev/null bs=1m count=1 I could do bs=1m before the DMA code went in. If the system freezes I see: atapi_error: READ_BIG - timeout error = 00 <long pause> the dd puts out a message about transferring 0 records ata1: master: timeout waiting to give command s = d8 e = 00 I got one panic which was (transcribed by hand, I had dump off): Fatal trap 12: page fault while in kernel mode fault virtual address = 0x10 fault code = supervisor write, page not present instruction pointer = 0x8:0xc01f4266 stack pointer = 0x10:0xc9825d7c frame pointer = 0x10:0xc9825d94 code segment = base 0x0, limit 0xfffff, type 0x1b processor cflags = interrupt enabled, resume, IOPL = 0 current process = 43899 (dd) interrupt mask = bio trap number = 12 panic: page fault I turned dump on and tried again but got a system freeze (reset to reboot) instead with no panic and no dump. The relevant dmesg stuff: ata-pci0: <Intel PIIX4 IDE controller> at device 4.1 on pci0 ata-pci0: Busmastering DMA supported ata0 at 0x01f0 irq 14 on ata-pci0 ata1 at 0x0170 irq 15 on ata-pci0 ... ata0: master: setting up UDMA2 mode on PIIX4 chip OK ad0: <WDC AC310200R/17.01J17> ATA-4 disk at ata0 as master ad0: 9787MB (20044080 sectors), 19885 cyls, 16 heads, 63 S/T, 512 B/S ad0: piomode=4, dmamode=2, udmamode=2 ad0: 16 secs/int, 0 depth queue, DMA mode ata0: slave: setting up UDMA2 mode on PIIX4 chip OK ad1: <FUJITSU MPC3084AT/6021> ATA-3 disk at ata0 as slave ad1: 8063MB (16514064 sectors), 16383 cyls, 16 heads, 63 S/T, 512 B/S ad1: piomode=4, dmamode=2, udmamode=2 ad1: 16 secs/int, 0 depth queue, DMA mode ata1: master: setting up UDMA2 mode on PIIX4 chip OK ad2: <WDC AC36400L/09.09M08> ATA-4 disk at ata1 as master ad2: 6149MB (12594960 sectors), 13328 cyls, 15 heads, 63 S/T, 512 B/S ad2: piomode=4, dmamode=2, udmamode=2 ad2: 16 secs/int, 0 depth queue, DMA mode atapi: piomode=4, dmamode=2, udmamode=-1 ata1: slave: setting up WDMA2 mode on PIIX3/4 chip OK atapi: DMA transfer mode set acd0: <MATSHITA CR-586/KS15> CDROM drive at ata1 as slave acd0: drive speed 5515KB/sec, 256KB cache, DMA acd0: supported read types: CD-R, CD-RW, CD-DA acd0: Audio: play, 256 volume levels acd0: Mechanism: ejectable tray acd0: Medium: CD-ROM 120mm data disc loaded, unlocked -- Kevin Street street@iname.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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