Date: Thu, 9 Dec 1999 08:26:48 +0100 (CET) From: Soren Schmidt <sos@freebsd.dk> To: straka@home.com (Richard S. Straka) Cc: freebsd-current@FreeBSD.ORG (freebsd-current@FreeBSD.ORG) Subject: Re: ata vs wd driver performance Message-ID: <199912090726.IAA73442@freebsd.dk> In-Reply-To: <384F407B.5484C354@home.com> from "Richard S. Straka" at "Dec 8, 1999 10:39:07 pm"
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It seems Richard S. Straka wrote: > I have recently performed some testing on the ata and wd drivers > on my system. When writing to and reading from a file on the same > file system in the same directory, the ata driver appears to take almost > > double the CPU time as compared to the wd driver. However, when > reading from the raw disk, the ata and wd driver take about the same > amount of CPU time. DMA is enabled in both driver. Since the old driver doesn't tell you which DMA mode it uses, its a bit difficult to compare, but my gues is that the wd driver set UDMA2 mode and from the ata probe it can bee seen it only sets WDMA2 mode. Besides you should upgrade your current, the ata driver has support for the VIA chip now... > Can someone explain why the ata driver is using more CPU? > > Rich Straka > straka@home.com > > ********* > wd driver results writing to a file. > > $ time dd if=/dev/zero of=test.dat bs=1024k count=256 > 256+0 records in > 256+0 records out > 268435456 bytes transferred in 41.810011 secs (6420363 bytes/sec) > > real 0m42.136s > user 0m0.002s > sys 0m19.939s > > ********* > ata driver results writing to a file. > > $ time dd if=/dev/zero of=test.dat bs=1024k count=256 > 256+0 records in > 256+0 records out > 268435456 bytes transferred in 39.475358 secs (6800077 bytes/sec) > > real 0m39.750s > user 0m0.008s > sys 0m35.665s > > > ******** > wd driver results reading from a file. > > $ time dd if=test.dat of=/dev/null bs=1024k count=256 > 256+0 records in > 256+0 records out > 268435456 bytes transferred in 39.992958 secs (6712068 bytes/sec) > > real 0m40.040s > user 0m0.025s > sys 0m13.387s > > ******** > ata driver results reading from a file. > > $ time dd if=test.dat of=/dev/null bs=1024k count=256 > 256+0 records in > 256+0 records out > 268435456 bytes transferred in 37.914618 secs (7079999 bytes/sec) > > real 0m37.944s > user 0m0.009s > sys 0m28.221s > > > ******** > wd results reading from raw disk. > > $ time dd if=/dev/rwd0 of=/dev/null bs=1024k count=256 > 256+0 records in > 256+0 records out > 268435456 bytes transferred in 33.100446 secs (8109723 bytes/sec) > > real 0m33.137s > user 0m0.000s > sys 0m0.266s > > ******** > ata results reading from raw disk. > > $ time dd if=/dev/rwd0 of=/dev/null bs=1024k count=256 > 256+0 records in > 256+0 records out > 268435456 bytes transferred in 34.518500 secs (7776568 bytes/sec) > > real 0m34.535s > user 0m0.000s > sys 0m0.222s > > > > ******************************************************* > dmesg with wd driver. > ******************************************************* > Copyright (c) 1992-1999 The FreeBSD Project. > Copyright (c) 1982, 1986, 1989, 1991, 1993 > The Regents of the University of California. All rights > reserved. > FreeBSD 4.0-CURRENT #1: Sat Dec 4 09:22:58 MST 1999 > > Timecounter "i8254" frequency 1193182 Hz > Timecounter "TSC" frequency 333189478 Hz > CPU: AMD-K6(tm) 3D processor (333.19-MHz 586-class CPU) > Origin = "AuthenticAMD" Id = 0x580 Stepping = 0 > Features=0x8001bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8,MMX> > AMD Features=0x80000800<SYSCALL,3DNow!> > real memory = 134152192 (131008K bytes) > avail memory = 127021056 (124044K bytes) > Preloaded elf kernel "kernel" at 0xc0303000. > npx0: <math processor> on motherboard > npx0: INT 16 interface > pcib0: <Host to PCI bridge> on motherboard > pci0: <PCI bus> on pcib0 > pcib1: <VIA 82C598MVP (Apollo MVP3) PCI-PCI (AGP) bridge> at device 1.0 > on pci0 > pci1: <PCI bus> on pcib1 > isab0: <VIA 82C586 PCI-ISA bridge> at device 7.0 on pci0 > isa0: <ISA bus> on isab0 > ide_pci0: <VIA 82C586x (Apollo) Bus-master IDE controller> at device 7.1 > on pci0 > chip1: <VIA 82C586B ACPI interface> at device 7.3 on pci0 > sym0: <875> irq 10 at device 8.0 on pci0 > sym0: Symbios NVRAM, ID 7, Fast-20, parity checking > sym0: open drain IRQ line driver, using on-chip SRAM > vga-pci0: <Matrox MGA 2164W graphics accelerator> at device 9.0 on pci0 > fxp0: <Intel EtherExpress Pro 10/100B Ethernet> irq 12 at device 10.0 on > pci0 > fxp0: Ethernet address 00:a0:c9:27:fc:1d > fdc0: <NEC 72065B or clone> at port 0x3f0-0x3f7 irq 6 drq 2 on isa0 > fdc0: FIFO enabled, 8 bytes threshold > fd0: <1440-KB 3.5" drive> on fdc0 drive 0 > wdc0 at port 0x1f0-0x1f7 irq 14 flags 0xa008a008 on isa0 > wdc0: unit 0 (wd0): <IBM-DCAA-34330>, DMA, 32-bit, multi-block-8 > wd0: 4134MB (8467200 sectors), 8400 cyls, 16 heads, 63 S/T, 512 B/S > wdc1 at port 0x170-0x177 irq 15 flags 0xa008a008 on isa0 > wdc1: unit 0 (wd2): <WDC AC22500L>, DMA, 32-bit, multi-block-8 > wd2: 2441MB (4999680 sectors), 4960 cyls, 16 heads, 63 S/T, 512 B/S > wdc1: unit 1 (atapi): <CD-ROM TW 120D/V2.10>, removable, dma, iordy > wcd0: drive speed 2062KB/sec, 240KB cache > wcd0: supported read types: CD-R, CD-DA > wcd0: Audio: play, 255 volume levels > wcd0: Mechanism: ejectable tray > wcd0: Medium: no/blank disc inside, unlocked > atkbdc0: <keyboard controller (i8042)> at port 0x60-0x6f on isa0 > atkbd0: <AT Keyboard> irq 1 on atkbdc0 > vga0: <Generic ISA VGA> at port 0x3b0-0x3df iomem 0xa0000-0xbffff on > isa0 > sc0: <System console> on isa0 > sc0: VGA <16 virtual consoles, flags=0x200> > sio0 at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0 > sio0: type 16550A > sio1 at port 0x2f8-0x2ff irq 3 on isa0 > sio1: type 16550A > sio2 at port 0x3e8-0x3ef irq 5 on isa0 > sio2: type 16550A > ppc0 at port 0x378-0x37f irq 7 drq 3 on isa0 > ppc0: Winbond chipset (ECP/EPP/PS2/NIBBLE) in COMPATIBLE mode > ppc0: FIFO with 16/16/16 bytes threshold > lpt0: <generic printer> on ppbus 0 > lpt0: Interrupt-driven port > ppi0: <generic parallel i/o> on ppbus 0 > pcm0: <CS4236> at port 0x530-0x53f irq 11 drq 1 flags 0xa610 on isa0 > Waiting 8 seconds for SCSI devices to settle > sym0: Downloading SCSI SCRIPTS. > (noperiph:sym0:0:-1:-1): SCSI bus reset delivered. > Mounting root from ufs:/dev/wd0s2a > da0 at sym0 bus 0 target 3 lun 0 > da0: <QUANTUM XP32275W LXY4> Fixed Direct Access SCSI-2 device > da0: 40.000MB/s transfers (20.000MHz, offset 16, 16bit), Tagged Queueing > Enabled > da0: 2170MB (4445380 512 byte sectors: 255H 63S/T 276C) > > > ******************************************************* > dmesg with ata driver. > ******************************************************* > Copyright (c) 1992-1999 The FreeBSD Project. > Copyright (c) 1982, 1986, 1989, 1991, 1993 > The Regents of the University of California. All rights > reserved. > FreeBSD 4.0-CURRENT #0: Wed Dec 8 22:13:02 MST 1999 > > Timecounter "i8254" frequency 1193182 Hz > Timecounter "TSC" frequency 333189391 Hz > CPU: AMD-K6(tm) 3D processor (333.19-MHz 586-class CPU) > Origin = "AuthenticAMD" Id = 0x580 Stepping = 0 > Features=0x8001bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8,MMX> > AMD Features=0x80000800<SYSCALL,3DNow!> > real memory = 134152192 (131008K bytes) > avail memory = 127029248 (124052K bytes) > Preloaded elf kernel "kernel" at 0xc0301000. > npx0: <math processor> on motherboard > npx0: INT 16 interface > pcib0: <Host to PCI bridge> on motherboard > pci0: <PCI bus> on pcib0 > pcib1: <VIA 82C598MVP (Apollo MVP3) PCI-PCI (AGP) bridge> at device 1.0 > on pci0 > pci1: <PCI bus> on pcib1 > isab0: <VIA 82C586 PCI-ISA bridge> at device 7.0 on pci0 > isa0: <ISA bus> on isab0 > ata-pci0: <VIA Apollo IDE controller> at device 7.1 on pci0 > ata-pci0: Busmastering DMA supported > ata0 at 0x01f0 irq 14 on ata-pci0 > ata1 at 0x0170 irq 15 on ata-pci0 > chip1: <VIA 82C586B ACPI interface> at device 7.3 on pci0 > sym0: <875> irq 10 at device 8.0 on pci0 > sym0: Symbios NVRAM, ID 7, Fast-20, parity checking > sym0: open drain IRQ line driver, using on-chip SRAM > vga-pci0: <Matrox MGA 2164W graphics accelerator> at device 9.0 on pci0 > fxp0: <Intel EtherExpress Pro 10/100B Ethernet> irq 12 at device 10.0 on > pci0 > fxp0: Ethernet address 00:a0:c9:27:fc:1d > fdc0: <NEC 72065B or clone> at port 0x3f0-0x3f7 irq 6 drq 2 on isa0 > fdc0: FIFO enabled, 8 bytes threshold > fd0: <1440-KB 3.5" drive> on fdc0 drive 0 > atkbdc0: <keyboard controller (i8042)> at port 0x60-0x6f on isa0 > atkbd0: <AT Keyboard> irq 1 on atkbdc0 > vga0: <Generic ISA VGA> at port 0x3b0-0x3df iomem 0xa0000-0xbffff on > isa0 > sc0: <System console> on isa0 > sc0: VGA <16 virtual consoles, flags=0x200> > sio0 at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0 > sio0: type 16550A > sio1 at port 0x2f8-0x2ff irq 3 on isa0 > sio1: type 16550A > sio2 at port 0x3e8-0x3ef irq 5 on isa0 > sio2: type 16550A > ppc0 at port 0x378-0x37f irq 7 drq 3 on isa0 > ppc0: Winbond chipset (ECP/EPP/PS2/NIBBLE) in COMPATIBLE mode > ppc0: FIFO with 16/16/16 bytes threshold > lpt0: <generic printer> on ppbus 0 > lpt0: Interrupt-driven port > ppi0: <generic parallel i/o> on ppbus 0 > pcm0: <CS4236> at port 0x530-0x53f irq 11 drq 1 flags 0xa610 on isa0 > ad0: <IBM-DCAA-34330/CA4OA42A> ATA-3 disk at ata0 as master > ad0: 4134MB (8467200 sectors), 8400 cyls, 16 heads, 63 S/T, 512 B/S > ad0: 16 secs/int, 1 depth queue, DMA > ad1: <WDC AC22500L/24.39E26> ATA-3 disk at ata1 as master > ad1: 2441MB (4999680 sectors), 4960 cyls, 16 heads, 63 S/T, 512 B/S > ad1: 16 secs/int, 1 depth queue, DMA > acd0: <CD-ROM TW 120D/V2.10> CDROM drive at ata1 as slave > acd0: read 2062KB/s (2062KB/s), 240KB buffer, PIO > acd0: supported read types: CD-R, CD-DA > acd0: Audio: play, 255 volume levels > acd0: Mechanism: ejectable tray > acd0: Medium: no/blank disc inside, unlocked > Waiting 8 seconds for SCSI devices to settle > sym0: Downloading SCSI SCRIPTS. > (noperiph:sym0:0:-1:-1): SCSI bus reset delivered. > Mounting root from ufs:/dev/wd0s2a > da0 at sym0 bus 0 target 3 lun 0 > da0: <QUANTUM XP32275W LXY4> Fixed Direct Access SCSI-2 device > da0: 40.000MB/s transfers (20.000MHz, offset 16, 16bit), Tagged Queueing > Enabled > da0: 2170MB (4445380 512 byte sectors: 255H 63S/T 276C) > > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-current" in the body of the message > -Søren To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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