Hi Anssi, Anssi Saari wrote on Sat, Oct 12 2002:
>How do you explain then that I for example can't write audio CDs any >faster than 14x in Linux and the system is hopelessly bogged down due >to this light IO task already at 8x writing? I am not Joerg, but I experienced the same thing during early trials. In my case it was simply a non optimal kernel-setup. The whole thing seems to be highly dependant on the chipset of the motherboard (meaning the kernel driver support for the chipset). My linux box has an elderly AMD-K6-III-400 CPU and an ALI 15x3 chipset. Here's my .config for Kernel 2.4.18 (only relevant parts quoted): # # ATA/IDE/MFM/RLL support # CONFIG_IDE=y # # IDE, ATA and ATAPI Block devices # CONFIG_BLK_DEV_IDE=y CONFIG_BLK_DEV_IDESCSI=y CONFIG_BLK_DEV_IDEPCI=y CONFIG_BLK_DEV_IDEDMA_PCI=y CONFIG_BLK_DEV_ADMA=y CONFIG_IDEDMA_PCI_AUTO=y CONFIG_BLK_DEV_IDEDMA=y CONFIG_BLK_DEV_ALI15X3=y CONFIG_IDEDMA_AUTO=y CONFIG_BLK_DEV_IDE_MODES=y I do *not* have IDE-CD driver in the kernel, have kernel boot-parm "ide0=ata66 hda=ide-scsi" in /etc/lilo.conf and issue "hdparm -d1 -X66 -c3 /dev/hda" during system-initialization. I found out, that it is important to activate the chipset-drivers for my ALI15x3 chipset (see above). >And in FreeBSD and Windows this is not a problem? I have a network-connected Win2K box with a PX-W4824A and here is absolutely no problem whatsoever. Just right-click the IDE-controller in "Device Manager", select Properties and switch the drop-down box to "DMA when available", reboot. >On the other hand, this slowdown happens only if the writer is >connected to VIA 686b. This feeds my suspicions about driver-support of the chipset. >If it's connected to a >CMD 649, Promise pdc20265 or Intel PIIX3 there's no problem. I could not get this Promise controller to work with a cd-writer. >I think Joerg put it very well in calling it a kernel design bug, as >that's exactly what it is. We probably all agree on that :-/ the IDE drivers have been orphaned for quite a while now and the current development (almost no scsi cd-writers available) has put further tension on the situation. >The only good thing about it is that it doesn't affect many IDE >controllers, the VIA 686b is the only one I know of. It really seems to be highly hardware-dependant. Kind regards Frederick -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
