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Date: Thu, 09 Nov 2006 22:50:33 -0500 From: Stephen Clark <Stephen.Clark@...lark.us> To: Stephen.Clark@...lark.us CC: Tejun Heo <htejun@...il.com>, Arjan van de Ven <arjan@...radead.org>, "\"J.A.\" Magallón" <jamagallon@....com>, Björn Steinbrink <B.Steinbrink@....de>, Mark Lord <lkml@....ca>, linux-kernel <linux-kernel@...r.kernel.org> Subject: Re: Abysmal PATA IDE performance Stephen Clark wrote: >Tejun Heo wrote: > > > >>Stephen Clark wrote: >>[--snip--] >> >> >> >> >>>ata1: SATA max UDMA/133 cmd 0x1F0 ctl 0x3F6 bmdma 0xFFA0 irq 14 >>>scsi0 : ata_piix >>>Synaptics Touchpad, model: 1, fw: 6.1, id: 0xa3a0b3, caps: 0xa04713/0x10008 >>>input: SynPS/2 Synaptics TouchPad as /class/input/input1 >>>ATA: abnormal status 0x7F on port 0x1F7 >>>ata2: PATA max UDMA/100 cmd 0x170 ctl 0x376 bmdma 0xFFA8 irq 15 >>>scsi1 : ata_piix >>>ata2.00: ATA-6, max UDMA/100, 117210240 sectors: LBA48 >>>ata2.00: ata2: dev 0 multi count 16 >>>usb 2-2: new low speed USB device using uhci_hcd and address 3 >>>ata2.01: ATAPI, max UDMA/33 >>>ata2.00: configured for UDMA/33 <==== why isn't this 66 or 100 ? >>> >>> >>> >>> >>See below. >> >> >> >> >> >>>===============**** >>>usb 2-2: configuration #1 chosen from 1 choice >>>input: Logitech USB-PS/2 Trackball as /class/input/input2 >>>input: USB HID v1.00 Mouse [Logitech USB-PS/2 Trackball] on >>>usb-0000:00:1d.1-2 >>>ata2.01: configured for UDMA/33 <=========== is this related to the >>>following 2 lines? ==== >>> >>> >>> >>> >>Nope, >> >> >> >> >> >>> Vendor: ATA Model: HTS721060G9AT00 Rev: MC3O >>> Type: Direct-Access ANSI SCSI revision: 05 >>>SCSI device sda: 117210240 512-byte hdwr sectors (60012 MB) >>>sda: Write Protect is off >>>sda: Mode Sense: 00 3a 00 00 >>>SCSI device sda: drive cache: write back >>>SCSI device sda: 117210240 512-byte hdwr sectors (60012 MB) >>>sda: Write Protect is off >>>sda: Mode Sense: 00 3a 00 00 >>>SCSI device sda: drive cache: write back >>>sda: sda1 sda2 >>>sd 1:0:0:0: Attached scsi disk sda >>> >>> >>> >>> >>The above is for ata2.00. >> >> >> >> >> >>> Vendor: HL-DT-ST Model: DVDRAM GMA-4082N Rev: HJ02 >>> Type: CD-ROM ANSI SCSI revision: 05 >>> >>> >>> >>> >>And, this for ata2.01. >> >>PATA devices occupying the same channel literally share the cable, and >>the driver needs to configure PIO mode of both devices to the slowest of >>the two (PIO mode is always configured regardless of actual transfer >>mode). UDMA mode doesn't save such restriction, so devices can be >>configured to its own maximum transfer mode. >> >>libata, until recently, simply used the slowest max transfer mode for >>both PIO and UDMA modes (MWDMA too). So, that's what's happening to >>you. Your cdrom's max UDMA mode is UDMA/33, so libata is using it for >>both devices on the channel. Recent kernels (2.6.19-rcX) don't have >>this restriction. Give 2.6.19-rc5 a shot. >> >> >> >> >> >Hi Tejun, > >Thanks for the info, I had started looking at the libata code but hadn't >progressed very far. > >Steve > > > Hi all, using 2.6.19-rc5 did give me udma 100 for my harddrive and a xfer rate of 44mbps. thanks to all who offered advice. Steve -- "They that give up essential liberty to obtain temporary safety, deserve neither liberty nor safety." (Ben Franklin) "The course of history shows that as a government grows, liberty decreases." (Thomas Jefferson) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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