On Wed, 12 Nov 2008 17:15:58 +0900, Tejun Heo <tj@xxxxxxxxxx> wrote: > Can you please test the attached patch? ata_piix 0000:00:07.1: version 2.12 scsi0 : ata_piix scsi1 : ata_piix ata1: PATA max MWDMA2 cmd 0x1f0 ctl 0x3f6 bmdma 0xe800 irq 14 ata2: PATA max MWDMA2 cmd 0x170 ctl 0x376 bmdma 0xe808 irq 15 ata1.00: ATA-5: IC35L040AVER07-0, ER4OA45A, max UDMA/100 ata1.00: 66055248 sectors, multi 16: LBA ata1.00: configured for MWDMA2 ata2.01: NODEV after polling detection ata2.00: ATAPI: SAMSUNG CD-R/RW SW-408B, M300, max MWDMA2 ata2.00: configured for MWDMA2 This is the output I get. I do not know if I have any stalls there since I am not in front of the machine right now. But if I understand "NODEV after polling detection" correctly, the code is no able to see that there is nothing attached there. I will give it another reboot when I am back home to see if the stall is still happening. On a side note, since we are already talking about old chipsets and mobos. Since this is a rather old hardware it was not possible to get the 40GB IBM disk running in the first place. What I did back then (2.4 kernel days) was to use "ibmsetmax" to clamp the disk to a smaller size and enabled the relevent option in the kernel. This way I got past the BIOS (it stopped if the harddisk was saying it was > 32GB??) but the linux kernel correctly saw the right size. Looking ad the dmesg output right now I think that it is only seeing the smaller size. sd 0:0:0:0: [sda] 66055248 512-byte hardware sectors (33820 MB) sd 0:0:0:0: [sda] Write Protect is off sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00 sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO ibmsetmax output: ./ibmsetmax /dev/sda Using device /dev/sda native max address: 66055247 that is 33820286976 bytes, 33.8 GB lba capacity: 66055248 sectors (33820286976 bytes) Is the clamping feature present in 2.6 by default? I cannot test this with a 2.4 kernel right now, since the libc no longer supports it. :) Anyway thank you all very much for your time and support, Michael -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
